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glibc/sysdeps/i386
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Joseph Myers 228a78c21b Fix i386 fdim double rounding (bug 20255). 
fdim suffers from double rounding on i386 because subtracting two
double values can produce an inexact long double value exactly half
way between two double values.  This patch fixes this by creating an
i386-specific version of fdim - C, based on the generic version,
unlike the previous .S version - which sets the x87 precision control
to double precision for the subtraction and then restores it
afterwards.  As noted in the comment added, there are no issues of
double rounding for subnormals (a case that setting precision control
does not address) because subtraction cannot produce an inexact result
in the subnormal range.

Tested for x86_64 and x86.

	[BZ #20255]
	* sysdeps/i386/fpu/s_fdim.c: New file.  Based on math/s_fdim.c.
	* math/libm-test.inc (fdim_test_data): Add another test.
2016-06-14 16:41:50 +00:00
..
fpu Fix i386 fdim double rounding (bug 20255). 2016-06-14 16:41:50 +00:00
i586 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
i686 Use generic fdim on more architectures (bug 6796, bug 20255, bug 20256). 2016-06-14 16:04:19 +00:00
i786
nptl Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sys Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
____longjmp_chk.S
__longjmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
abort-instr.h
add_n.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
addmul_1.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
asm-syntax.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
atomic-machine.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
backtrace.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
bcopy.S
bsd-_setjmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
bsd-setjmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
bzero.S
cacheinfo.c Move sysdeps/x86_64/cacheinfo.c to sysdeps/x86 2016-05-08 08:49:18 -07:00
configure configure: fix test == usage 2016-04-09 20:05:13 -04:00
configure.ac configure: fix test == usage 2016-04-09 20:05:13 -04:00
crti.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-machine.h Call init_cpu_features only if SHARED is defined 2016-05-13 08:29:33 -07:00
dl-procinfo.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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i386-mcount.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Implies
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jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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link-defines.sym
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machine-gmon.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Makefile When disabling SSE, make sure -fpmath is not set to use SSE either 2016-04-09 22:14:24 -04:00
memchr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
memcmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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memcpy.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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memmove.S
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memusage.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
mp_clz_tab.c
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preconfigure
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setjmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
stackguard-macros.h
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strcspn.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
string-inlines.c Improve generic strcspn performance 2016-04-01 10:44:40 -03:00
strlen.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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strtok_r.S
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sysdep.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tls-macros.h
tlsdesc.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tlsdesc.sym
tst-audit3.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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tst-ld-sse-use.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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