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Fix sin, sincos missing underflows (bug 16526, bug 16538).

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Similar to various other bugs in this area, some sin and sincos
implementations do not raise the underflow exception for subnormal
arguments, when the result is tiny and inexact.  This patch forces the
exception in a similar way to previous fixes.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #16526]
	[BZ #16538]
	* sysdeps/ieee754/dbl-64/s_sin.c: Include <float.h>.
	(__sin): Force underflow exception for arguments with small
	absolute value.
	* sysdeps/ieee754/flt-32/k_sinf.c: Include <float.h>.
	(__kernel_sinf): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-128/k_sincosl.c: Include <float.h>.
	(__kernel_sincosl): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-128/k_sinl.c: Include <float.h>.
	(__kernel_sinl): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-128ibm/k_sincosl.c: Include <float.h>.
	(__kernel_sincosl): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-128ibm/k_sinl.c: Include <float.h>.
	(__kernel_sinl): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-96/k_sinl.c: Include <float.h>.
	(__kernel_sinl): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/powerpc/fpu/k_sinf.c: Include <float.h>.
	(__kernel_sinf): Force underflow exception for arguments with
	small absolute value.
	* math/auto-libm-test-in: Add more tests of sin and sincos.
	* math/auto-libm-test-out: Regenerated.
This commit is contained in:
Joseph Myers
2015-06-23 22:24:20 +00:00
parent 8b1bab5ffa
commit ad39cce0da
12 changed files with 762 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
math/auto-libm-test-in
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@@ -2317,6 +2317,10 @@ sin 0x1.2001469775ce6p32
sin -0x3.3de320f6be87ep+1020
sin 0xe.9f1e5bc3bb88p+112
sin 0x4.7857dp+68
sin min
sin -min
sin min_subnorm
sin -min_subnorm
sincos 0
sincos -0
@@ -2339,6 +2343,10 @@ sincos 0x1p+28
sincos -0x3.3de320f6be87ep+1020
sincos 0xe.9f1e5bc3bb88p+112
sincos 0x4.7857dp+68
sincos min
sincos -min
sincos min_subnorm
sincos -min_subnorm
sinh 0
sinh -0