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* soft-fp: Fix _FP_FMA when product is zero and third argument is finite (bug ↵Joseph Myers2015-02-061-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 17932). soft-fp's _FP_FMA fails to set the result's exponent for cases where the result of the multiplication is 0, yielding incorrect (arbitrary, depending on uninitialized values) results for those cases. This affects libm for architectures using soft-fp to implement fma. This patch adds the exponent setting and tests for this case. Tested for ARM soft-float (which uses soft-fp fma), x86_64 and x86 (to verify not introducing new libm test failures there). (This bug showed up in testing my patch to move the Linux kernel to current soft-fp. math/Makefile has "override CFLAGS += -Wno-uninitialized" which would have stopped compiler warnings from showing up this problem, although I wouldn't be surprised if removing that shows spurious warnings from this code, if the compiler fails to follow that various cases where the exponent is uninitialized don't need it initialized because the class is set to a value meaning the uninitialized exponent isn't used.) [BZ #17932] * soft-fp/op-common.h (_FP_FMA): Set exponent of result in case where multiplication results in zero and third argument is finite and nonzero. * math/auto-libm-test-in: Add more tests of fma. * math/auto-libm-test-out: Regenerated.
* soft-fp: Refine FP_EX_DENORM handling for comparisons.Joseph Myers2015-02-061-4/+45
| | | | | | | | | | | | | | | | | | | | | | In <https://sourceware.org/ml/libc-alpha/2014-09/msg00488.html>, I noted that comparisons in soft-fp did not set FP_EX_DENORM unless denormal operands were flushed to zero. This patch fixes soft-fp to check for denormal operands for comparisons and set that exception whenever FP_EX_DENORM is not zero. In particular, for the one architecture for which the Linux kernel defines FP_EX_DENORM (alpha), this corresponds to the existing logic for comparisons and so allows that logic to be replaced by a simple call to FP_CMP_D when soft-fp is updated in the kernel. Tested for powerpc (e500) that installed stripped shared libraries are unchanged by this patch. * soft-fp/op-common.h (_FP_CMP_CHECK_DENORM): New macro. (_FP_CMP_CHECK_FLUSH_ZERO): Likewise. (_FP_CMP): Use_FP_CMP_CHECK_DENORM and _FP_CMP_CHECK_FLUSH_ZERO. (_FP_CMP_EQ): Likewise. (_FP_CMP_UNORD): Use _FP_CMP_CHECK_DENORM.
* soft-fp: Support floating-point extensions without quieting sNaNs.Joseph Myers2015-02-061-4/+10
| | | | | | | | | | | | | | | | | | | | | | | One special case needed in soft-fp to replace the old version in the Linux kernel is extending from a narrower floating-point format to a wider one without quieting signaling NaNs. (This is for arch/powerpc/math-emu/lfs.c, where previously it used the old FP_CONV which didn't do anything special for NaNs, then handled packing specially for NaNs to avoid quieting at packing time, and discarded the exceptions from unpacking.) This patch accordingly refactors FP_EXTEND, creating a separate _FP_EXTEND_CNAN that offers a choice of how NaNs are handled, with FP_EXTEND reimplemented as a wrapper that provides the common case of the IEEE operation that does quiet signaling NaNs and raise exceptions for them. Tested for powerpc (e500) that installed stripped shared libraries are unchanged by this patch. * soft-fp/op-common.h (FP_EXTEND): Rename to _FP_EXTEND_CNAN with extra argument CHECK_NAN. Redefine as wrapper around _FP_EXTEND_CNAN.
* soft-fp: Use __label__ for all labels within macros.Joseph Myers2015-01-221-0/+5
| | | | | | | | | | | | | | | | | | | soft-fp has various macros containing labels and goto statements. Because label names are function-scoped, this is problematic for using the same macro more than once within a function, which some architectures do in the Linux kernel (the soft-fp version there predates the addition of any of these labels and gotos). This patch fixes this by using __label__ to make the labels local to the block with the __label__ declaration. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by this patch. * soft-fp/op-common.h (_FP_ADD_INTERNAL): Declare labels with __label__. (_FP_FMA): Likewise. (_FP_TO_INT_ROUND): Likewise. (_FP_FROM_INT): Likewise.
* Update copyright dates with scripts/update-copyrights.Joseph Myers2015-01-0288-88/+88
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* soft-fp: Add _FP_TO_INT_ROUND.Joseph Myers2014-11-045-0/+226
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Continuing the series of patches adding soft-fp features from the kernel version of soft-fp to glibc so that glibc's version is able to replace the old fork of soft-fp in the kernel, this patch adds the last major such feature: _FP_TO_INT_ROUND, converting a floating-point number to an integer with rounding according to the current rounding direction (as opposed to truncating towards zero, which _FP_TO_INT does). The general structure of the implementation follows that of _FP_TO_INT, but of course is more complicated. As with glibc's _FP_TO_INT it works with raw input (the kernel versions of these macros predate the conversion of _FP_TO_INT and many other macros to raw or semi-raw input). I have not tried to work out what bugs there might be in the kernel version that this might fix; it's a from-scratch implementation based on _FP_TO_INT. Tested for powerpc (soft-float) that there is no change to the installed shared libraries; also tested with the libm tests with lrint / lrintf / llrint / llrintf made to use _FP_TO_INT_ROUND, to provide some test of the functionality. As we don't have benchmarks for those functions, I haven't actually included the soft-fp versions of them, although I expect them to be faster than the existing code (given that the existing code involves adding and subtracting numbers such as 0x1p52 to achieve the desired rounding, which is not particularly efficient when the underlying floating point is software floating point). 2014-11-04 Joseph Myers <joseph@codesourcery.com> * soft-fp/op-common.h (_FP_TO_INT_ROUND): New macro. * soft-fp/double.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_D): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_D): Likewise. * soft-fp/extended.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_E): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_E): Likewise. * soft-fp/quad.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_Q): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_Q): Likewise. * soft-fp/single.h (FP_TO_INT_ROUND_S): New macro.
* soft-fp: Use parentheses around macro arguments.Joseph Myers2014-10-098-305/+328
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch cleans up the soft-fp code to use parentheses around macro arguments (where possible; many macro arguments are identifiers used with ## rather than arbitrary expressions, so cannot be put in parentheses). (I'm not aware of any bugs caused by the lack of parentheses, but this is generally good practice. The patch is not exhaustive regarding internal macros where the arguments always come directly from the mantissa of a floating-point number, although probably those should be cleaned up in this regard as well.) Tested for powerpc-nofpu that the installed shared libraries are unchanged by this patch. * soft-fp/double.h [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_D): Use parentheses around macro arguments. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE < 64] (_FP_SQRT_MEAT_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_EQ_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_UNORD_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_D): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_FROM_INT_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_DP): Likewise. [_FP_W_TYPE_SIZE >= 64] (_FP_SQRT_MEAT_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_EQ_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_UNORD_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_D): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_FROM_INT_D): Likewise. * soft-fp/extended.h [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE < 64] (_FP_SQRT_MEAT_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_EQ_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_UNORD_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_E): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_FROM_INT_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_EP): Likewise. [_FP_W_TYPE_SIZE >= 64] (_FP_SQRT_MEAT_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_EQ_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_UNORD_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_E): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_FROM_INT_E): Likewise. * soft-fp/op-1.h (_FP_FRAC_SRST_1): Likewise. (_FP_FRAC_SRS_1): Likewise. (_FP_FRAC_CLZ_1): Likewise. (_FP_MUL_MEAT_1_imm): Likewise. (_FP_MUL_MEAT_1_wide): Likewise. (_FP_MUL_MEAT_1_hard): Likewise. (_FP_SQRT_MEAT_1): Likewise. (_FP_FRAC_ASSEMBLE_1): Likewise. (_FP_FRAC_DISASSEMBLE_1): Likewise. * soft-fp/op-2.h (_FP_FRAC_CLZ_2): Likewise. (__FP_CLZ_2): Likewise. (_FP_MUL_MEAT_2_wide): Likewise. (_FP_MUL_MEAT_2_wide_3mul): Likewise. (_FP_MUL_MEAT_2_gmp): Likewise. (_FP_MUL_MEAT_2_120_240_double): Likewise. (_FP_SQRT_MEAT_2): Likewise. (_FP_FRAC_ASSEMBLE_2): Likewise. (_FP_FRAC_DISASSEMBLE_2): Likewise. * soft-fp/op-4.h (_FP_FRAC_SRS_4): Likewise. (_FP_FRAC_CLZ_4): Likewise. (_FP_MUL_MEAT_4_wide): Likewise. (_FP_MUL_MEAT_4_gmp): Likewise. (_FP_SQRT_MEAT_4): Likewise. (_FP_FRAC_ASSEMBLE_4): Likewise. (_FP_FRAC_DISASSEMBLE_4): Likewise. * soft-fp/op-common.h (_FP_CMP): Likewise. (_FP_CMP_EQ): Likewise. (_FP_CMP_UNORD): Likewise. (_FP_TO_INT): Likewise. (_FP_FROM_INT): Likewise. [!__FP_CLZ] (__FP_CLZ): Likewise. (_FP_DIV_HELP_imm): Likewise. * soft-fp/quad.h [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_UNPACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_PACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE < 64] (_FP_SQRT_MEAT_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_EQ_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_CMP_UNORD_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_Q): Likewise. [_FP_W_TYPE_SIZE < 64] (FP_FROM_INT_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_RAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_UNPACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_PACK_SEMIRAW_QP): Likewise. [_FP_W_TYPE_SIZE >= 64] (_FP_SQRT_MEAT_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_EQ_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_CMP_UNORD_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_Q): Likewise. [_FP_W_TYPE_SIZE >= 64] (FP_FROM_INT_Q): Likewise. * soft-fp/single.h (FP_UNPACK_RAW_S): Likewise. (FP_UNPACK_RAW_SP): Likewise. (FP_PACK_RAW_S): Likewise. (FP_PACK_RAW_SP): Likewise. (FP_UNPACK_S): Likewise. (FP_UNPACK_SP): Likewise. (FP_UNPACK_SEMIRAW_S): Likewise. (FP_UNPACK_SEMIRAW_SP): Likewise. (FP_PACK_S): Likewise. (FP_PACK_SP): Likewise. (FP_PACK_SEMIRAW_S): Likewise. (FP_PACK_SEMIRAW_SP): Likewise. (_FP_SQRT_MEAT_S): Likewise. (FP_CMP_S): Likewise. (FP_CMP_EQ_S): Likewise. (FP_CMP_UNORD_S): Likewise. (FP_TO_INT_S): Likewise. (FP_FROM_INT_S): Likewise.
* soft-fp: Support rsigned == 2 in _FP_TO_INT.Joseph Myers2014-10-091-7/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Continuing the addition of soft-fp features in the Linux kernel version, this patch adds _FP_TO_INT support for rsigned == 2 (reduce overflowing results modulo 2^rsize to fit in the destination, used for alpha emulation). The kernel version is buggy; it can left shift by a negative amount when right shifting is required in an overflow case (the kernel version also has other bugs fixed long ago in glibc; at least, spurious exceptions converting to the most negative integer). This version avoids that by handling overflow (other than to 0) for rsigned == 2 along with the normal non-overflow case, which already properly determines the direction in which to shift. Tested for powerpc-nofpu. Some functions get slightly bigger and some get slightly smaller, no doubt as a result of the change to where in the macro "inexact" is raised, but I don't think those changes are significant. Also tested for powerpc-nofpu with the relevant __fix* functions changed to use rsigned == 2 (which is after all just as valid as rsigned == 1 in IEEE terms), including verifying the results and exceptions for various cases of conversions. With these seven patches, the one remaining feature to add for the soft-fp code to have all the features of the kernel version is _FP_TO_INT_ROUND. * soft-fp/op-common.h (_FP_TO_INT): Handle rsigned == 2.
* soft-fp: Support more precise "invalid" exceptions.Joseph Myers2014-10-092-81/+147
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As previously discussed <https://sourceware.org/ml/libc-alpha/2013-10/msg00345.html>, it would be desirable to be able to use the same version of the soft-fp code in the Linux kernel as well as in glibc and libgcc (instead of an old version in the kernel that's missing ten years of bug fixes, performance improvements and new features), and to that end it is useful to add to glibc's copy features in the kernel's copy, even when they are not directly useful in glibc. To that end, this patch adds one of those features: support for more precise "invalid" exceptions describing the particular kind of invalid operation. These are relevant for powerpc emulation, and are also as described in IEEE 754-2008 as sub-exceptions. The set of sub-exceptions here is the union of those supported on powerpc and those from IEEE 754-2008 (the former adds a distinction between 0/0 and Inf/Inf; the latter adds a distinction between Inf*0 from multiplication and the same from fma). This includes sub-exceptions for sqrt, conversions to integer and comparisons that are not supported in the kernel; I see no obvious reason for these being missing from the kernel support, given that they are supported on powerpc so accurate powerpc emulation should generate them. Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. * soft-fp/soft-fp.h (FP_EX_INVALID_SNAN): New macro. (FP_EX_INVALID_IMZ): Likewise. (FP_EX_INVALID_IMZ_FMA): Likewise. (FP_EX_INVALID_ISI): Likewise. (FP_EX_INVALID_ZDZ): Likewise. (FP_EX_INVALID_IDI): Likewise. (FP_EX_INVALID_SQRT): Likewise. (FP_EX_INVALID_CVI): Likewise. (FP_EX_INVALID_VC): Likewise. * soft-fp/op-common.h (_FP_UNPACK_CANONICAL): Specify more precise "invalid" exceptions. (_FP_CHECK_SIGNAN_SEMIRAW): Likewise. (_FP_ADD_INTERNAL): Likewise. (_FP_MUL): Likewise. (_FP_FMA): Likewise. (_FP_DIV): Likewise. (_FP_CMP_CHECK_NAN): Likewise. (_FP_SQRT): Likewise. (_FP_TO_INT): Likewise. (FP_EXTEND): Likewise.
* soft-fp: Add FP_DENORM_ZERO.Joseph Myers2014-10-092-1/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Continuing the addition of soft-fp features used in the Linux kernel, this patch adds soft-fp support for FP_DENORM_ZERO (flushing input subnormal operands to zero of the same sign). There are some differences from the kernel version. In the kernel, the "inexact" exception is set when flushing to zero. This does not appear to match the documented semantics for either of the architectures (alpha and sh) for which the kernel uses FP_DENORM_ZERO, so this patch does not set "inexact" in this case. More operations now use raw or semi-raw unpacking for optimization than did in the ten-year-old soft-fp version in the kernel, so checks of FP_DENORM_ZERO are inserted in those operations. They are also inserted for comparisons (which already used raw unpacking in the old version) as I believe that's the correct thing to do when input subnormals are flushed to zero. They are *not* inserted for _FP_NEG. (If any processors do flush input subnormals to zero for negation, or otherwise vary from the rules implemented when FP_DENORM_ZERO is set, further macros for sfp-machine.h to control this may need to be added.) Although the addition for comparisons will cause FP_EX_DENORM to be set in this case, it still won't be set for comparisons involving subnormals when not flushed to zero. It's quite possible that accurate emulation of processors that have such an exception for subnormal operands will require further changes relating to when FP_EX_DENORM is set (in general, the support for things defined by IEEE should be considered more reliable and mature than the support for things outside the scope of IEEE floating point). Although some processors also have a mode for abrupt underflow - producing zeroes instead of output subnormals - there is no such mode in the kernel's soft-fp, so no such mode is added to glibc's soft-fp (although it could be if someone wanted to emulate such processor support). Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. * soft-fp/soft-fp.h (FP_DENORM_ZERO): New macro. * soft-fp/op-common.h (_FP_UNPACK_CANONICAL): Check FP_DENORM_ZERO. (_FP_CHECK_FLUSH_ZERO): New macro. (_FP_ADD_INTERNAL): Call _FP_CHECK_FLUSH_ZERO. (_FP_CMP): Likewise. (_FP_CMP_EQ): Likewise. (_FP_TO_INT): Do not set inexact for subnormal arguments if FP_DENORM_ZERO. (FP_EXTEND): Call _FP_CHECK_FLUSH_ZERO. (FP_TRUNC): Likewise.
* soft-fp: Fix _FP_TO_INT latent bug in overflow handling.Joseph Myers2014-10-091-2/+7
| | | | | | | | | | | | | | | | | | | | This patch fixes a latent bug in _FP_TO_INT regarding handling of arguments with maximum exponent (infinities and NaNs). If the maximum exponent is below that calculated as an overflow threshold, such values would incorrectly be treated as normal values for the purposes of the conversion. This could not occur for any of the conversions actually occurring in glibc, libgcc or the Linux kernel (the maximum exponent for float is, just, big enough to ensure overflow for unsigned __int128), but would apply if soft-fp were used for IEEE binary16. Appropriate checks are inserted to ensure that the maximum exponent is always treated as an overflowing exponent, and never as a normal one. Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. * soft-fp/op-common.h (_FP_TO_INT): Ensure maximum exponent is treated as invalid conversion, not as normal exponent.
* soft-fp: Refactor exception handling for comparisons.Joseph Myers2014-10-0917-61/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch refactors how soft-fp comparisons handle setting exceptions for NaN operands, so that exceptions are set through the FP_CMP macros rather than directly in the C files calling them. The _FP_CMP* and FP_CMP* macros gain an extra argument to specify when exceptions should be set, 0 for no exception setting (I'm not sure this is actually needed - at least it's not needed for IEEE operations in glibc / libgcc, but might be relevant in some cases for kernel use), 1 for exceptions only for signaling NaNs and 2 for exceptions for all NaNs. This argument is handled through _FP_CMP_CHECK_NAN, newly called by the _FP_CMP* macros when a NaN is encountered. Calls to these macros are updated, which eliminates all the existing checking and exception setting in soft-fp *.c files in glibc. Tested for powerpc-nofpu. (The __unord* functions have no code changes; the __eq* / __ge* / __le* functions get slightly larger, but I don't think that's significant.) * soft-fp/op-common.h (_FP_CMP_CHECK_NAN): New macro. (_FP_CMP): Add extra argument EX. Call _FP_CMP_CHECK_NAN. (_FP_CMP_EQ): Likewise. (_FP_CMP_UNORD): Likewise. * soft-fp/double.h (FP_CMP_D): Add extra argument EX. (FP_CMP_EQ_D): Likewise. (FP_CMP_UNORD_D): Likewise. * soft-fp/extended.h (FP_CMP_E): Likewise. (FP_CMP_EQ_E): Likewise. (FP_CMP_UNORD_E): Likewise. * soft-fp/quad.h (FP_CMP_Q): Likewise. (FP_CMP_EQ_Q): Likewise. (FP_CMP_UNORD_Q): Likewise. * soft-fp/single.h (FP_CMP_S): Likewise. (FP_CMP_EQ_S): Likewise. (FP_CMP_UNORD_S): Likewise. * soft-fp/eqdf2.c (__eqdf2): Update call to FP_CMP_EQ_D. * soft-fp/eqsf2.c (__eqsf2): Update call to FP_CMP_EQ_S. * soft-fp/eqtf2.c (__eqtf2): Update call to FP_CMP_EQ_Q. * soft-fp/gedf2.c (__gedf2): Update call to FP_CMP_D. * soft-fp/gesf2.c (__gesf2): Update call to FP_CMP_S. * soft-fp/getf2.c (__getf2): Update call to FP_CMP_Q. * soft-fp/ledf2.c (__ledf2): Update call to FP_CMP_D. * soft-fp/lesf2.c (__lesf2): Update call to FP_CMP_S. * soft-fp/letf2.c (__letf2): Update call to FP_CMP_Q. * soft-fp/unorddf2.c (__unorddf2): Update call to FP_CMP_UNORD_D. * soft-fp/unordsf2.c (__unordsf2): Update call to FP_CMP_UNORD_S. * soft-fp/unordtf2.c (__unordtf2): Update call to FP_CMP_UNORD_Q. * sysdeps/alpha/soft-fp/ots_cmpe.c (internal_compare): Update call to FP_CMP_Q. * sysdeps/sparc/sparc32/soft-fp/q_cmp.c (_Q_cmp): Update call to FP_CMP_Q. * sysdeps/sparc/sparc32/soft-fp/q_cmpe.c (_Q_cmpe): Likewise. * sysdeps/sparc/sparc32/soft-fp/q_feq.c (_Q_feq): Update call to FP_CMP_EQ_Q. * sysdeps/sparc/sparc32/soft-fp/q_fge.c (_Q_fge): Update call to FP_CMP_Q. * sysdeps/sparc/sparc32/soft-fp/q_fgt.c (_Q_fgt): Likewise. * sysdeps/sparc/sparc32/soft-fp/q_fle.c (_Q_fle): Likewise. * sysdeps/sparc/sparc32/soft-fp/q_flt.c (_Q_flt): Likewise. * sysdeps/sparc/sparc32/soft-fp/q_fne.c (_Q_fne): Update call to FP_CMP_EQ_Q. * sysdeps/sparc/sparc64/soft-fp/qp_cmp.c (_Qp_cmp): Update call to FP_CMP_Q. * sysdeps/sparc/sparc64/soft-fp/qp_cmpe.c (_Qp_cmpe): Likewise. * sysdeps/sparc/sparc64/soft-fp/qp_feq.c (_Qp_feq): Update call to FP_CMP_EQ_Q. * sysdeps/sparc/sparc64/soft-fp/qp_fge.c (_Qp_fge): Update call to FP_CMP_Q. * sysdeps/sparc/sparc64/soft-fp/qp_fgt.c (_Qp_fgt): Likewise. * sysdeps/sparc/sparc64/soft-fp/qp_fle.c (_Qp_fle): Likewise. * sysdeps/sparc/sparc64/soft-fp/qp_flt.c (_Qp_flt): Likewise. * sysdeps/sparc/sparc64/soft-fp/qp_fne.c (_Qp_fne): Update call to FP_CMP_EQ_Q.
* soft-fp: Make extensions of subnormals from XFmode to TFmode signal ↵Joseph Myers2014-10-096-2/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | underflow if traps enabled. This patch fixes a soft-fp corner case I previously noted in <https://sourceware.org/ml/libc-alpha/2013-10/msg00349.html>: when trapping on underflow is enabled, extensions of subnormals from XFmode to TFmode need to signal underflow because the result is tiny (but exact, so the underflow flag is not raised unless trapping is enabled). To avoid any excess initialization or tests for other cases of floating-point extensions, a new FP_INIT_TRAPPING_EXCEPTIONS is added that does the initialization required for this particular case (more than FP_INIT_EXCEPTIONS, less than FP_INIT_ROUNDMODE, in general), and FP_NO_EXACT_UNDERFLOW is added to stub out FP_TRAPPING_EXCEPTIONS tests for those cases of extensions where the test would be dead code, to avoid any uninitialized variable warnings. As the relevant case only applies in libgcc, not to any use of soft-fp in glibc, there is no bug report in Bugzilla and no non-default definitions of FP_INIT_TRAPPING_EXCEPTIONS are added by the patch. A testcase will be added to GCC as part of an update of soft-fp in libgcc once this patch is in libc. Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. Bootstrapped GCC with updated soft-fp with no regressions on x86_64-unknown-linux-gnu and verified that a test of the relevant case passes where it failed before. * soft-fp/op-common.h (FP_EXTEND): When a subnormal input produces a subnormal result, set the underflow exception if trapping on underflow is enabled. * soft-fp/soft-fp.h (FP_INIT_TRAPPING_EXCEPTIONS): New macro. (FP_INIT_EXCEPTIONS): Default to FP_INIT_TRAPPING_EXCEPTIONS. [FP_NO_EXACT_UNDERFLOW] (FP_TRAPPING_EXCEPTIONS): Undefine and redefine to 0. * soft-fp/extenddftf2.c (FP_NO_EXACT_UNDERFLOW): Define. * soft-fp/extendsfdf2.c (FP_NO_EXACT_UNDERFLOW): Likewise. * soft-fp/extendsftf2.c (FP_NO_EXACT_UNDERFLOW): Likewise. * soft-fp/extendxftf2.c (__extendxftf2): Use FP_INIT_TRAPPING_EXCEPTIONS instead of FP_INIT_ROUNDMODE.
* soft-fp: Remove FP_CLEAR_EXCEPTIONS.Joseph Myers2014-10-091-3/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As noted in <https://sourceware.org/ml/libc-alpha/2013-10/msg00516.html>, the soft-fp macro FP_CLEAR_EXCEPTIONS should not be necessary, as soft-fp code should never set an exception and later clear it. In fact, all four uses in glibc (for SPARC) are indeed unnecessary: they appear in files that convert 32-bit or 64-bit integers to IEEE binary128, an operation that can never raise any exceptions. If this was intended to enable the compiler to optimize away any FP_FROM_INT code testing for exceptional cases, we now have a better way of doing this: defining FP_NO_EXCEPTIONS before including soft-fp.h causes all code handling exceptions to be stubbed out, and the rounding mode to be hardwired for round-to-zero, to allow such optimizations for source files where (a) the operation in question, for the particular types in question, can never raise exceptions, but (b) some instances of the operation for other types can, so the macros used in the file do contain references to rounding or exceptions, albeit dead in that particular file. The uses in the Linux kernel are also unnecessary (clearing exceptions at a point where they are already cleared). This patch duly removes FP_CLEAR_EXCEPTIONS, making the SPARC code in question use FP_NO_EXCEPTIONS and stop using exception-related macros. * soft-fp/soft-fp.h (FP_CLEAR_EXCEPTIONS): Remove macro. * sysdeps/sparc/sparc32/soft-fp/q_itoq.c: Define FP_NO_EXCEPTIONS. (_Q_itoq): Do not use FP_DECL_EX, FP_CLEAR_EXCEPTIONS or FP_HANDLE_EXCEPTIONS. * sysdeps/sparc/sparc32/soft-fp/q_lltoq.c: Define FP_NO_EXCEPTIONS. (_Q_lltoq): Do not use FP_DECL_EX, FP_CLEAR_EXCEPTIONS or FP_HANDLE_EXCEPTIONS. * sysdeps/sparc/sparc32/soft-fp/q_ulltoq.c: Define FP_NO_EXCEPTIONS. (_Q_ulltoq): Do not use FP_DECL_EX, FP_CLEAR_EXCEPTIONS or FP_HANDLE_EXCEPTIONS. * sysdeps/sparc/sparc32/soft-fp/q_utoq.c: Define FP_NO_EXCEPTIONS. (_Q_utoq): Do not use FP_DECL_EX, FP_CLEAR_EXCEPTIONS or FP_HANDLE_EXCEPTIONS.
* soft-fp: Fix comment formatting.Joseph Myers2014-09-177-183/+113
| | | | | | | | | | | | | | | | | This patch fixes formatting of comments in soft-fp (in particular, the normal style in glibc does not have a leading '*' on each line, and comments should start with capital letters and end with ". */"). Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. * soft-fp/extended.h: Fix comment formatting. * soft-fp/op-1.h: Likewise. * soft-fp/op-2.h: Likewise. * soft-fp/op-4.h: Likewise. * soft-fp/op-8.h: Likewise. * soft-fp/op-common.h: Likewise. * soft-fp/soft-fp.h: Likewise.
* soft-fp: Correct _FP_TO_INT formatting.Joseph Myers2014-09-171-5/+7
| | | | | | | | | | This patch corrects some soft-fp formatting that failed to follow the GNU Coding Standards. Tested for powerpc-nofpu that the disassembly of installed shared libraries is unchanged by this patch. * soft-fp/op-common.h (_FP_TO_INT): Correct formatting.
* Rename soft-fp op-[1248].h variables to avoid risk of shadowing.Joseph Myers2014-06-304-510/+726
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Continuing the soft-fp variable renaming from <https://sourceware.org/ml/libc-alpha/2014-06/msg00434.html> to avoid shadowing if two macros happen to use the same variable name and that variable is involved in an argument one of those macros passes to another, this patch renames variables in op-[1248].h. (The two patches are to different files and are independent of each other.) Tested for powerpc32 (soft-float) and mips64 that this makes no change to the disassembly of installed shared libraries. * soft-fp/op-1.h (_FP_UNPACK_RAW_1): Rename local variables to include macro name. (_FP_UNPACK_RAW_1_P): Likewise. (_FP_PACK_RAW_1): Likewise. (_FP_PACK_RAW_1_P): Likewise. (_FP_MUL_MEAT_1_wide): Likewise. (_FP_MUL_MEAT_DW_1_hard): Likewise. (_FP_MUL_MEAT_1_hard): Likewise. (_FP_DIV_MEAT_1_imm): Likewise. (_FP_DIV_MEAT_1_udiv_norm): Likewise. (_FP_DIV_MEAT_1_udiv): Likewise. * soft-fp/op-2.h (__FP_FRAC_DEC_2): Likewise. (_FP_UNPACK_RAW_2): Likewise. (_FP_UNPACK_RAW_2_P): Likewise. (_FP_PACK_RAW_2): Likewise. (_FP_PACK_RAW_2_P): Likewise. (_FP_MUL_MEAT_DW_2_wide): Likewise. (_FP_MUL_MEAT_2_wide): Likewise. (_FP_MUL_MEAT_DW_2_wide_3mul): Likewise. (_FP_MUL_MEAT_2_wide_3mul): Likewise. (_FP_MUL_MEAT_DW_2_gmp): Likewise. (_FP_MUL_MEAT_2_gmp): Likewise. (_FP_DIV_MEAT_2_udiv): Likewise. * soft-fp/op-4.h (_FP_FRAC_SLL_4): Likewise. (_FP_FRAC_SRL_4): Likewise. (_FP_FRAC_SRST_4): Likewise. (_FP_FRAC_SRS_4): Likewise. (_FP_UNPACK_RAW_4): Likewise. (_FP_UNPACK_RAW_4_P): Likewise. (_FP_PACK_RAW_4): Likewise. (_FP_PACK_RAW_4_P): Likewise. (_FP_MUL_MEAT_DW_4_wide): Likewise. (_FP_MUL_MEAT_4_wide): Likewise. (_FP_MUL_MEAT_4_gmp): Likewise. (umul_ppppmnnn): Likewise. (_FP_DIV_MEAT_4_udiv): Likewise. (__FP_FRAC_ADD_4): Likewise. (__FP_FRAC_SUB_3): Likewise. (__FP_FRAC_SUB_4): Likewise. (__FP_FRAC_DEC_3): Likewise. (__FP_FRAC_DEC_4): Likewise. (__FP_FRAC_ADDI_4): Likewise. * soft-fp/op-8.h (_FP_FRAC_SLL_8): Likewise. (_FP_FRAC_SRL_8): Likewise. (_FP_FRAC_SRS_8): Likewise.
* Rename soft-fp extended.h, op-common.h variables to avoid risk of shadowing.Joseph Myers2014-06-302-258/+299
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In <https://sourceware.org/ml/libc-alpha/2013-06/msg00851.html>, I fixed a bug caused by multiple soft-fp macros using the same variable names, resulting in shadowing when one macro called another that used the same variable name, with an argument involving the variable in the outer macro. The fix was to rename the local variables so their names included the containing macro name, to ensure uniqueness. I noted then that this would make sense more systematically for all variables in any soft-fp macro. Since then, I've used such variable names in new soft-fp macros. This patch now converts existing macros in extended.h and op-common.h to use this convention. (op-[1248].h are intended to be converted separately.) (Name conflicts could arise for label names as well, but because those are function-scope in C any such conflict will give an immediate compile error rather than a subtle bug, so there's no need for preemptive renaming in that case.) Tested for powerpc32 (soft-float) and mips64 that this makes no change to the disassembly of installed shared libraries. * soft-fp/extended.h (FP_UNPACK_RAW_E): Rename local variables to include macro name. (FP_UNPACK_RAW_EP): Likewise. (FP_PACK_RAW_E): Likewise. (FP_PACK_RAW_EP): Likewise. * soft-fp/op-common.h (_FP_UNPACK_CANONICAL): Likewise. (_FP_ISSIGNAN): Likewise. (_FP_ADD_INTERNAL): Likewise. (_FP_FMA): Likewise. (_FP_CMP): Likewise. (_FP_SQRT): Likewise. (_FP_TO_INT): Likewise. (_FP_FROM_INT): Likewise. (FP_EXTEND): Likewise. (_FP_DIV_MEAT_N_loop): Likewise.
* Consistently include Makeconfig after defining subdir.Joseph Myers2014-02-261-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In <https://sourceware.org/ml/libc-alpha/2014-01/msg00196.html> I noted it was necessary to add includes of Makeconfig early in various subdirectory makefiles for the tests-special variable settings added by that patch to be conditional on configuration information. No-one commented on the general question there of whether Makeconfig should always be included immediately after the definition of subdir. This patch implements that early inclusion of Makeconfig in each directory (which is a lot easier than consistent placement of includes of Rules). Includes are added if needed, or moved up if already present. Subdirectory "all:" targets are removed, since Makeconfig provides one. There is potential for further cleanups I haven't done. Rules and Makerules have code such as ifneq "$(findstring env,$(origin headers))" "" headers := endif to override to empty any value of various variables that came from the environment. I think there is a case for Makeconfig setting all the subdirectory variables (other than subdir) to empty to ensure no outside value is going to take effect if a subdirectory fails to define a variable. (A list of such variables, possibly out of date and incomplete, is in manual/maint.texi.) Rules and Makerules would give errors if Makeconfig hadn't already been included, instead of including it themselves. The special code to override values coming from the environment would then be obsolete and could be removed. Tested x86_64, including that installed binaries are identical before and after the patch. * argp/Makefile: Include Makeconfig immediately after defining subdir. * assert/Makefile: Likewise. * benchtests/Makefile: Likewise. * catgets/Makefile: Likewise. * conform/Makefile: Likewise. * crypt/Makefile: Likewise. * csu/Makefile: Likewise. (all): Remove target. * ctype/Makefile: Include Makeconfig immediately after defining subdir. * debug/Makefile: Likewise. * dirent/Makefile: Likewise. * dlfcn/Makefile: Likewise. * gmon/Makefile: Likewise. * gnulib/Makefile: Likewise. * grp/Makefile: Likewise. * gshadow/Makefile: Likewise. * hesiod/Makefile: Likewise. * hurd/Makefile: Likewise. (all): Remove target. * iconvdata/Makefile: Include Makeconfig immediately after defining subdir. * inet/Makefile: Likewise. * intl/Makefile: Likewise. * io/Makefile: Likewise. * libio/Makefile: Likewise. (all): Remove target. * locale/Makefile: Include Makeconfig immediately after defining subdir. * login/Makefile: Likewise. * mach/Makefile: Likewise. (all): Remove target. * malloc/Makefile: Include Makeconfig immediately after defining subdir. (all): Remove target. * manual/Makefile: Include Makeconfig immediately after defining subdir. * math/Makefile: Likewise. * misc/Makefile: Likewise. * nis/Makefile: Likewise. * nss/Makefile: Likewise. * po/Makefile: Likewise. (all): Remove target. * posix/Makefile: Include Makeconfig immediately after defining subdir. * pwd/Makefile: Likewise. * resolv/Makefile: Likewise. * resource/Makefile: Likewise. * rt/Makefile: Likewise. * setjmp/Makefile: Likewise. * shadow/Makefile: Likewise. * signal/Makefile: Likewise. * socket/Makefile: Likewise. * soft-fp/Makefile: Likewise. * stdio-common/Makefile: Likewise. * stdlib/Makefile: Likewise. * streams/Makefile: Likewise. * string/Makefile: Likewise. * sunrpc/Makefile: Likewise. (all): Remove target. * sysvipc/Makefile: Include Makeconfig immediately after defining subdir. * termios/Makefile: Likewise. * time/Makefile: Likewise. * timezone/Makefile: Likewise. (all): Remove target. * wcsmbs/Makefile: Include Makeconfig immediately after defining subdir. * wctype/Makefile: Likewise. libidn/ChangeLog: * Makefile: Include Makeconfig immediately after defining subdir. localedata/ChangeLog: * Makefile: Include Makeconfig immediately after defining subdir. (all): Remove target. nptl/ChangeLog: * Makefile: Include Makeconfig immediately after defining subdir. nptl_db/ChangeLog: * Makefile: Include Makeconfig immediately after defining subdir.
* soft-fp: support after-rounding tininess detection.Joseph Myers2014-02-122-4/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | IEEE 754-2008 defines two ways in which tiny results can be detected, "before rounding" (based on the infinite-precision result) and "after rounding" (based on the result when rounded to normal precision as if the exponent range were unbounded). All binary operations on an architecture must use the same choice of how tininess is detected. soft-fp has so far implemented only before-rounding tininess detection. This patch adds support for after-rounding tininess detection. A new macro _FP_TININESS_AFTER_ROUNDING is added that sfp-machine.h must define (soft-fp is meant to be self-contained so the existing tininess.h files aren't used here, though the information going in sfp-machine.h has been taken from them). The soft-fp macros dealing with raising underflow exceptions then handle the cases where the choice matters specially, rounding a copy of the input to the appropriate precision to see if a value that's tiny before rounding isn't tiny after rounding. Tested for mips64 using GCC trunk (which now uses soft-fp on MIPS, so supporting exceptions and rounding modes for long double where not previously supported - this is the immediate motivation for doing this patch now) together with (a) a patch to sysdeps/mips/math-tests.h to enable exceptions / rounding modes tests for long double for GCC 4.9 and later, and (b) corresponding changes applied to libgcc's soft-fp and sfp-machine.h files. In the libgcc context this is also tested on x86_64 (also an after-rounding architecture) with testcases for __float128 that I intend to add to the GCC testsuite when updating soft-fp there. (To be clear: this patch does not fix any glibc bugs that were user-visible in past releases, since after-rounding architectures didn't use soft-fp in any affected case with support for floating-point exceptions - so there is no corresponding Bugzilla bug. Rather, it works together with the GCC changes to use soft-fp on MIPS to allow previously absent long double functionality to work properly, and allows soft-fp to be used in glibc on after-rounding architectures in cases where it couldn't previously be used.) * soft-fp/op-common.h (_FP_DECL): Mark exponent as possibly unused. (_FP_PACK_SEMIRAW): Determine tininess based on rounding shifted value if _FP_TININESS_AFTER_ROUNDING and unrounded value is in subnormal range. (_FP_PACK_CANONICAL): Determine tininess based on rounding to normal precision if _FP_TININESS_AFTER_ROUNDING and unrounded value has largest subnormal exponent. * soft-fp/soft-fp.h [FP_NO_EXCEPTIONS] (_FP_TININESS_AFTER_ROUNDING): Undefine and redefine to 0. * sysdeps/aarch64/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): New macro. * sysdeps/alpha/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/arm/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/mips/mips64/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/mips/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/powerpc/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/sh/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/sparc/sparc32/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/sparc/sparc64/soft-fp/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise. * sysdeps/tile/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING): Likewise.
* Update copyright notices with scripts/update-copyrightsAllan McRae2014-01-0188-88/+88
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* Avoid "left shift count >= width of type" warnings in soft-fp code.Uros Bizjak2013-11-261-4/+4
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* soft-fp: make extensions quiet signaling NaNs (bug 16041).Joseph Myers2013-10-171-0/+1
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* soft-fp: fix horizontal whitespace.Joseph Myers2013-10-1687-1783/+1785
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* soft-fp: remove unused macros.Joseph Myers2013-10-152-33/+0
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* soft-fp: fix vertical whitespace and indentation.Joseph Myers2013-10-1585-3286/+3777
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* soft-fp: fix preprocessor indentation.Joseph Myers2013-10-128-278/+279
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* soft-fp: make __unord* raise "invalid" for signaling NaNs (bug 16036).Joseph Myers2013-10-123-0/+15
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* soft-fp: make ordered comparisons raise "invalid" for quiet NaNs (bug 14910).Joseph Myers2013-10-126-6/+6
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* soft-fp: add missing FP_INIT_EXCEPTIONS and FP_INIT_ROUNDMODE calls.Joseph Myers2013-10-1239-0/+39
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* soft-fp: add macro FP_NO_EXCEPTIONS.Joseph Myers2013-10-127-12/+30
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* soft-fp: fix _FP_DIV_MEAT_* returning results with wrong exponent (bug 16032).Joseph Myers2013-10-122-4/+4
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* soft-fp: fix floating-point to integer unsigned saturation.Joseph Myers2013-10-121-1/+1
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* Update copyright and license notices in soft-fp files from libgcc.Joseph Myers2013-10-1014-56/+42
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* Add soft-fp files from libgcc.Joseph Myers2013-10-1014-0/+646
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* soft-fp: split FP_INIT_EXCEPTIONS from FP_INIT_ROUNDMODE.Joseph Myers2013-10-104-3/+11
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* soft-fp: fix negation NaN handling (bug 16034).Joseph Myers2013-10-104-18/+7
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* soft-fp: Remove trailing semicolon from _FP_FRAC_DISASSEMBLE_4.Joseph Myers2013-10-091-1/+1
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* soft-fp: fix typo in comment.Adam Buchbinder2013-10-091-1/+1
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* Implement fma in soft-fp.Joseph Myers2013-07-0211-97/+580
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* Fix soft-fp shadowing between __FP_FRAC_ADD_3 and _FP_MUL_MEAT_2_wide_3mul ↵Joseph Myers2013-06-221-6/+6
| | | | (bug 15667).
* Fix bad shift in soft-fp (bug 7006).Joseph Myers2013-06-211-2/+3
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* Fix leading whitespaces.Ondrej Bilka2013-06-064-20/+20
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* Remove trailing whitespace.Joseph Myers2013-06-056-22/+22
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* MIPS: soft-fp NaN representation correctionsMaciej W. Rozycki2013-05-162-11/+54
| | | | | | | | [BZ #15442] This adds support for the inverse interpretation of the quiet bit of IEEE 754 floating-point NaN data that some processors use. This includes in particular MIPS architecture processors; the payload used for the canonical qNaN encoding is updated accordingly so as not to interfere with the quiet bit.
* soft-fp: s/sNAN/NAN/ -- no sNaNs are ever produced.Maciej W. Rozycki2013-04-251-1/+1
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* Update copyright notices with scripts/update-copyrights.Joseph Myers2013-01-0271-72/+71
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* Add script to update copyright notices and reformat some to facilitate its use.Joseph Myers2013-01-011-2/+1
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* soft-fp: Fix used without set warning in _FP_MUL and _FP_DIVRichard Henderson2012-12-071-2/+2
| | | | | | | | | | | | | Seen in, e.g. ports/sysdeps/alpha/soft-fp/ots_mul.c. The problem here is we have a switch on the class of X*Y, followed by a switch on the class of R. The exponent field of R really is not set by the first switch for NaN outputs, because we know it's not going to be used. The compiler is not smart enough to see through this. By pulling the exponent computation out of the NORMAL*NORMAL path, we will not be pessimizing the most common case, while still providing an arbitrary value to satisfy the compiler.
* Fix "set but not used" warnings for X##_s in soft-fp.Joseph Myers2012-12-051-2/+4
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