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glibc/sysdeps/x86
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Joseph Myers 6ace393821 Fix pow missing underflows (bug 18825). 
Similar to various other bugs in this area, pow functions can fail to
raise the underflow exception when the result is tiny and inexact but
one or more low bits of the intermediate result that is scaled down
(or, in the i386 case, converted from a wider evaluation format) are
zero.  This patch forces the exception in a similar way to previous
fixes, thereby concluding the fixes for known bugs with missing
underflow exceptions currently filed in Bugzilla.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #18825]
	* sysdeps/i386/fpu/i386-math-asm.h (FLT_NARROW_EVAL_UFLOW_NONNAN):
	New macro.
	(DBL_NARROW_EVAL_UFLOW_NONNAN): Likewise.
	(LDBL_CHECK_FORCE_UFLOW_NONNAN): Likewise.
	* sysdeps/i386/fpu/e_pow.S: Use DEFINE_DBL_MIN.
	(__ieee754_pow): Use DBL_NARROW_EVAL_UFLOW_NONNAN instead of
	DBL_NARROW_EVAL, reloading the PIC register as needed.
	* sysdeps/i386/fpu/e_powf.S: Use DEFINE_FLT_MIN.
	(__ieee754_powf): Use FLT_NARROW_EVAL_UFLOW_NONNAN instead of
	FLT_NARROW_EVAL.  Use separate return path for case when first
	argument is NaN.
	* sysdeps/i386/fpu/e_powl.S: Include <i386-math-asm.h>.  Use
	DEFINE_LDBL_MIN.
	(__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN, reloading the
	PIC register.
	* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Use
	math_check_force_underflow_nonneg.
	* sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): Force
	underflow for subnormal result.
	* sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Use
	math_check_force_underflow_nonneg.
	* sysdeps/x86/fpu/powl_helper.c (__powl_helper): Use
	math_check_force_underflow.
	* sysdeps/x86_64/fpu/x86_64-math-asm.h
	(LDBL_CHECK_FORCE_UFLOW_NONNAN): New macro.
	* sysdeps/x86_64/fpu/e_powl.S: Include <x86_64-math-asm.h>.  Use
	DEFINE_LDBL_MIN.
	(__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN.
	* math/auto-libm-test-in: Add more tests of pow.
	* math/auto-libm-test-out: Regenerated.
2015-09-25 22:29:10 +00:00
..
bits Rename bits/linkmap.h to linkmap.h (bug 14912). 2015-09-04 19:44:27 +00:00
fpu Fix pow missing underflows (bug 18825). 2015-09-25 22:29:10 +00:00
cpu-features-offsets.sym Add _dl_x86_cpu_features to rtld_global 2015-08-13 03:41:22 -07:00
cpu-features.c Detect and select i586/i686 implementation at run-time 2015-08-27 09:06:44 -07:00
cpu-features.h Detect and select i586/i686 implementation at run-time 2015-08-27 09:06:44 -07:00
dl-get-cpu-features.c Add _dl_x86_cpu_features to rtld_global 2015-08-13 03:41:22 -07:00
elide.h nptl: Document crash due to incorrect use of locks 2015-08-20 08:44:37 +02:00
fpu_control.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
init-arch.h Detect and select i586/i686 implementation at run-time 2015-08-27 09:06:44 -07:00
libc-start.c Add _dl_x86_cpu_features to rtld_global 2015-08-13 03:41:22 -07:00
linkmap.h Rename bits/linkmap.h to linkmap.h (bug 14912). 2015-09-04 19:44:27 +00:00
Makefile Don't disable SSE in x86-64 ld.so 2015-08-26 07:55:42 -07:00
rtld-global-offsets.sym Add _dl_x86_cpu_features to rtld_global 2015-08-13 03:41:22 -07:00
tininess.h Use sysdeps/x86/tininess.h for i386 and x86_64 2012-10-30 20:38:31 -07:00
tst-get-cpu-features-static.c Add _dl_x86_cpu_features to rtld_global 2015-08-13 03:41:22 -07:00
tst-get-cpu-features.c Add _dl_x86_cpu_features to rtld_global 2015-08-13 03:41:22 -07:00
Versions Add _dl_x86_cpu_features to rtld_global 2015-08-13 03:41:22 -07:00