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glibc/sysdeps/ieee754
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Joseph Myers c8235dda72 Avoid excess range overflowing results from cosh, sinh, lgamma (bug 18980). 
Various i386 libm functions return values with excess range and
precision; Wilco Dijkstra's patches to make isfinite etc. expand
inline cause this pre-existing issue to result in test failures (when
e.g. a result that overflows float but not long double gets counted as
overflowing for some purposes but not others).

This patch addresses those cases arising from functions defined in C,
adding a math_narrow_eval macro that forces values to memory to
eliminate excess precision if FLT_EVAL_METHOD indicates this is
needed, and is a no-op otherwise.  I'll convert existing uses of
volatile and asm for this purpose to use the new macro later, once
i386 has clean test results again (which requires fixes for .S files
as well).

Tested for x86_64 and x86.  Committed.

	[BZ #18980]
	* sysdeps/generic/math_private.h: Include <float.h>.
	(math_narrow_eval): New macro.
	[FLT_EVAL_METHOD != 0] (excess_precision): Likewise.
	* sysdeps/ieee754/dbl-64/e_cosh.c (__ieee754_cosh): Use
	math_narrow_eval on overflowing return value.
	* sysdeps/ieee754/dbl-64/e_lgamma_r.c (__ieee754_lgamma_r):
	Likewise.
	* sysdeps/ieee754/dbl-64/e_sinh.c (__ieee754_sinh): Likewise.
	* sysdeps/ieee754/flt-32/e_coshf.c (__ieee754_coshf): Likewise.
	* sysdeps/ieee754/flt-32/e_lgammaf_r.c (__ieee754_lgammaf_r):
	Likewise.
	* sysdeps/ieee754/flt-32/e_sinhf.c (__ieee754_sinhf): Likewise.
2015-09-18 20:00:48 +00:00
..
bits Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
dbl-64 Avoid excess range overflowing results from cosh, sinh, lgamma (bug 18980). 2015-09-18 20:00:48 +00:00
flt-32 Avoid excess range overflowing results from cosh, sinh, lgamma (bug 18980). 2015-09-18 20:00:48 +00:00
ldbl-64-128 Make scalbn set errno (bug 6803). 2015-09-16 21:11:00 +00:00
ldbl-96 Since we now inline isinf, isnan and isfinite in math.h, replace uses of __isinf_ns(l/f) 2015-09-18 20:51:52 +01:00
ldbl-128 Since we now inline isinf, isnan and isfinite in math.h, replace uses of __isinf_ns(l/f) 2015-09-18 20:51:52 +01:00
ldbl-128ibm Since we now inline isinf, isnan and isfinite in math.h, replace uses of __isinf_ns(l/f) 2015-09-18 20:51:52 +01:00
ldbl-opt Make scalbn set errno (bug 6803). 2015-09-16 21:11:00 +00:00
ieee754.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
k_standard.c Add comment to CSTR macro in k_standard.c. 2015-02-27 01:12:19 +00:00
k_standardf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
k_standardl.c Fix spurious "inexact" exceptions from __kernel_standard_l (bug 18245, bug 18583). 2015-06-23 17:26:46 +00:00
Makefile Avoid -Wno-write-strings for k_standard.c. 2015-02-26 22:50:54 +00:00
s_lib_version.c
s_matherr.c
s_signgam.c