Commit message (Collapse) | Author | Age | Files | Lines | |
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* | Use libm_alias_ldouble in sysdeps/x86_64/fpu. | Joseph Myers | 2017-11-17 | 1 | -1/+2 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch continues the preparation for additional _FloatN / _FloatNx function aliases by using libm_alias_ldouble for sysdeps/x86_64/fpu long double functions, so that they can have _Float64x aliases added in future. Tested for x86_64, including build-many-glibcs.py tests that installed stripped shared libraries are unchanged by the patch. * sysdeps/x86_64/fpu/e_expl.S: Include <libm-alias-ldouble.h>. [USE_AS_EXPM1L] (expm1l): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_ceill.S: Include <libm-alias-ldouble.h>. (ceill): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_copysignl.S: Include <libm-alias-ldouble.h>. (copysignl): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_fabsl.S: Include <libm-alias-ldouble.h>. (fabsl): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_floorl.S: Include <libm-alias-ldouble.h>. (floorl): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_fmaxl.S: Include <libm-alias-ldouble.h>. (fmaxl): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_fminl.S: Include <libm-alias-ldouble.h>. (fminl): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_llrintl.S: Include <libm-alias-ldouble.h>. (llrintl): Define using libm_alias_ldouble. (lrintl): Likewise. * sysdeps/x86_64/fpu/s_nearbyintl.S: Include <libm-alias-ldouble.h>. (nearbyintl): Define using libm_alias_ldouble. * sysdeps/x86_64/fpu/s_truncl.S: Include <libm-alias-ldouble.h>. (truncl): Define using libm_alias_ldouble. * sysdeps/x86_64/x32/fpu/s_lrintl.S: Include <libm-alias-ldouble.h>. (lrintl): Define using libm_alias_ldouble. | ||||
* | Avoid "inexact" exceptions in i386/x86_64 floor functions (bug 15479). | Joseph Myers | 2016-06-27 | 1 | -5/+10 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As discussed in <https://sourceware.org/ml/libc-alpha/2016-05/msg00577.html>, TS 18661-1 disallows ceil, floor, round and trunc functions from raising the "inexact" exception, in accordance with general IEEE 754 semantics for when that exception is raised. Fixing this for x87 floating point is more complicated than for the other versions of these functions, because they use the frndint instruction that raises "inexact" and this can only be avoided by saving and restoring the whole floating-point environment. As I noted in <https://sourceware.org/ml/libc-alpha/2016-06/msg00128.html>, I have now implemented a GCC option -fno-fp-int-builtin-inexact for GCC 7, such that GCC will inline these functions on x86, without caring about "inexact", when the default -ffp-int-builtin-inexact is in effect. This allows users to get optimized code depending on the options they pass to the compiler, while making the out-of-line functions follow TS 18661-1 semantics and avoid "inexact". This patch duly fixes the out-of-line floor function implementations to avoid "inexact", in the same way as the nearbyint implementations. I do not know how the performance of implementations such as these based on saving the environment and changing the rounding mode temporarily compares to that of the C versions or SSE 4.1 versions (of course, for 32-bit x86 SSE implementations still need to get the return value in an x87 register); it's entirely possible other implementations could be faster in some cases. Tested for x86_64 and x86. [BZ #15479] * sysdeps/i386/fpu/s_floor.S (__floor): Save and restore floating-point environment rather than just control word. * sysdeps/i386/fpu/s_floorf.S (__floorf): Likewise. * sysdeps/i386/fpu/s_floorl.S (__floorl): Save and restore floating-point environment, with "invalid" exceptions merged in, rather than just control word. * sysdeps/x86_64/fpu/s_floorl.S (__floorl): Likewise. * math/libm-test.inc (floor_test_data): Do not allow spurious "inexact" exceptions. | ||||
* | Update. | Ulrich Drepper | 2003-11-18 | 1 | -0/+30 |
2003-11-17 Jakub Jelinek <jakub@redhat.com> * posix/regcomp.c (optimize_utf8): Optimize multi-byte chars as well. * posix/bug-regex20.c (tests): Add new tests. Multi-byte char followed by dup operator is expected to be optimized. * posix/regexec.c (check_node_accept_bytes): Move nrules and j variables to the block where they are only used, initialize nrules only immediately before using it. 2003-11-15 Andreas Jaeger <aj@suse.de> * sysdeps/x86_64/fpu/s_scalbnl.S: New file. * sysdeps/x86_64/fpu/s_truncl.S: New file. * sysdeps/x86_64/fpu/s_nearbyintl.S: New file. * sysdeps/x86_64/fpu/s_floorl.S: New file. * sysdeps/x86_64/fpu/s_ilogbl.S: New file. * sysdeps/x86_64/fpu/e_remainderl.S: New file. * math/libm-test.inc (floor_test): Test also ±0.25. (ceil_test): Test -0.25. |