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This patch fixes the remaining part of bug 16560, spurious underflows
from exp2 of arguments close to 0 (when the result is close to 1, so
should not underflow), by just using 1+x instead of a more complicated
calculation when the argument is sufficiently small.
Tested for x86_64, x86 and mips64.
[BZ #16560]
* math/e_exp2l.c [LDBL_MANT_DIG == 106] (LDBL_EPSILON): Undefine
and redefine.
(__ieee754_exp2l): Do not multiply small fractional parts by
M_LN2l.
* sysdeps/i386/fpu/e_exp2l.S (__ieee754_exp2l): Just add 1 to
small argument.
* sysdeps/ieee754/dbl-64/e_exp2.c (__ieee754_exp2): Likewise.
* sysdeps/ieee754/flt-32/e_exp2f.c (__ieee754_exp2f): Likewise.
* sysdeps/x86_64/fpu/e_exp2l.S (__ieee754_exp2l): Likewise.
* math/auto-libm-test-in: Add more tests of exp2.
* math/auto-libm-test-out: Regenerated.
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libm is now somewhat integrated with gcc's -ffinite-math-only option
and lots of the wrapper functions have been optimized.
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into $(inst_includedir)/%.h from sysdirs.
[headers]: Change static pattern rule for installing
$(headers) to do only those not matching %.h.
($(inst_includedir)/%.h: $(objpfx)%.h): Add this pattern rule instead.
($(inst_includedir)/%.h: %.h): Likewise.
($(inst_includedir)/%.h: $(..)include/%.h): Likewise.
* Makefile ($(inst_includedir)/gnu/stubs.h):
Add $(make-target-directory).
* stdlib/Makefile (headers): Restore headers removed in last change.
2006-01-16 Jakub Jelinek <jakub@redhat.com>
* math/e_exp2l.c: Don't include stdio.h, errno.h, stub-tag.h, include
math_private.h.
(__ieee754_exp2l): Compute for now as expl (M_LN2l * x)
instead of failing.
(exp2l): Remove stub_warning.
2006-01-15 Jakub Jelinek <jakub@redhat.com>
* io/tst-faccessat.c (do_test): Don't fail if geteuid () == 0.
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