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glibc/sysdeps/x86_64
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Joseph Myers 0a2546cdaa Fix x86, x86_64 fmax, fmin sNaN handling, add tests (bug 20947). 
Various fmax and fmin function implementations mishandle sNaN
arguments:

(a) When both arguments are NaNs, the return value should be a qNaN,
but sometimes it is an sNaN if at least one argument is an sNaN.

(b) Under TS 18661-1 semantics, if either argument is an sNaN then the
result should be a qNaN (whereas if one argument is a qNaN and the
other is not a NaN, the result should be the non-NaN argument).
Various implementations treat sNaNs like qNaNs here.

This patch fixes the x86 and x86_64 versions (ignoring float and
double for 32-bit x86 given the inability to reliably avoid the sNaN
turning into a qNaN before it gets to the called function).  Tests of
sNaN inputs to these functions are added.

Note on architecture versions I haven't changed for this issue:
AArch64 already gets this right (it uses a hardware instruction with
the correct semantics for both quiet and signaling NaNs) and does not
need changes.  It's possible Alpha, IA64, SPARC might need changes
(this would be shown by the testsuite if so).

Tested for x86_64 and x86 (both i686 and i586 builds, to cover the
different x86 implementations).

	[BZ #20947]
	* sysdeps/i386/fpu/s_fmaxl.S (__fmaxl): Add the arguments when
	either is a signaling NaN.
	* sysdeps/i386/fpu/s_fminl.S (__fminl): Likewise.  Make code
	follow fmaxl more closely.
	* sysdeps/i386/i686/fpu/s_fmaxl.S (__fmaxl): Add the arguments
	when either is a signaling NaN.
	* sysdeps/i386/i686/fpu/s_fminl.S (__fminl): Likewise.
	* sysdeps/x86_64/fpu/s_fmax.S (__fmax): Likewise.
	* sysdeps/x86_64/fpu/s_fmaxf.S (__fmaxf): Likewise.
	* sysdeps/x86_64/fpu/s_fmaxl.S (__fmaxl): Likewise.
	* sysdeps/x86_64/fpu/s_fmin.S (__fmin): Likewise.
	* sysdeps/x86_64/fpu/s_fminf.S (__fminf): Likewise.
	* sysdeps/x86_64/fpu/s_fminl.S (__fminl): Likewise.
	* math/libm-test.inc (fmax_test_data): Add tests of sNaN inputs.
	(fmin_test_data): Likewise.
2016-12-15 23:52:18 +00:00
..
64 Move architecture shlib-versions files to Linux-specific directories. 2014-07-17 14:31:12 +00:00
fpu Fix x86, x86_64 fmax, fmin sNaN handling, add tests (bug 20947). 2016-12-15 23:52:18 +00:00
multiarch Require binutils 2.24 to build x86-64 glibc [BZ #20139] 2016-07-01 06:03:05 -07:00
nptl Remove cached PID/TID in clone 2016-11-24 19:38:51 -02:00
x32 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
____longjmp_chk.S ____longjmp_chk is now OS-specific. 2009-07-30 21:42:27 -07:00
__longjmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
_mcount.S 2016-03-03 Paul Pluzhnikov <ppluzhnikov@google.com> 2016-03-03 09:53:49 -08:00
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
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
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 Make an empty file. 2007-10-16 05:59:15 +00:00
configure Require binutils 2.24 to build x86-64 glibc [BZ #20139] 2016-07-01 06:03:05 -07:00
configure.ac Require binutils 2.24 to build x86-64 glibc [BZ #20139] 2016-07-01 06:03:05 -07:00
crti.S Replace PREINIT_FUNCTION@PLT with *%rax in call 2016-03-04 16:15:41 -08:00
crtn.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-irel.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-machine.h Check IFUNC definition in unrelocated shared library [BZ #20019] 2016-10-28 09:12:15 -07:00
dl-procinfo.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-runtime.c * elf/dl-runtime.c (reloc_offset): Define. 2009-03-15 00:26:14 +00:00
dl-tls.h elf: Consolidate machine-agnostic DTV definitions in <dl-dtv.h> 2016-06-20 14:31:40 +02:00
dl-tlsdesc.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-tlsdesc.S x86-64: Properly align stack in _dl_tlsdesc_dynamic [BZ #20309] 2016-07-12 06:30:08 -07:00
dl-trampoline.h X86-64: Add _dl_runtime_resolve_avx[512]_{opt|slow} [BZ #20508] 2016-09-06 08:51:07 -07:00
dl-trampoline.S X86-64: Add _dl_runtime_resolve_avx[512]_{opt|slow} [BZ #20508] 2016-09-06 08:51:07 -07:00
ffs.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ffsll.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
hp-timing.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
htonl.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ifuncmain8.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ifuncmod8.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Implies Use x86-64 bits/byteswap.h for both i386 and x86_64 2012-05-30 14:13:18 -07:00
jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
l10nflist.c Minor optimization of popcount in l10nflist 2011-08-11 14:07:04 -04:00
ldbl2mpn.c [BZ #4586] 2007-06-08 02:50:59 +00:00
ldsodefs.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
link-defines.sym Replace __int128 with __int128_t 2014-05-30 10:50:21 -07:00
locale-defines.sym Implement optimized strcaecmp for x86-64. 2010-07-30 00:14:04 -07:00
localplt.data ld.so: Remove __libc_memalign 2016-11-30 16:23:58 +01:00
lshift.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
machine-gmon.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Makefile Register extra test objects 2016-04-13 17:07:13 +02:00
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
memcopy.h X86-64: Add dummy memcopy.h and wordcopy.c 2016-06-09 04:38:34 -07:00
memcpy_chk.S x86_64: fix static build of __memcpy_chk for compilers defaulting to PIC/PIE 2016-11-24 16:56:26 +01:00
memcpy.S X86-64: Remove previous default/SSE2/AVX2 memcpy/memmove 2016-06-08 13:58:08 -07:00
memmove_chk.S X86-64: Remove previous default/SSE2/AVX2 memcpy/memmove 2016-06-08 13:58:08 -07:00
memmove.S X86-64: Remove previous default/SSE2/AVX2 memcpy/memmove 2016-06-08 13:58:08 -07:00
mempcpy_chk.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
mempcpy.S X86-64: Remove previous default/SSE2/AVX2 memcpy/memmove 2016-06-08 13:58:08 -07:00
memrchr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
memset_chk.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
memset.S X86-64: Remove the previous SSE2/AVX2 memsets 2016-06-08 13:56:14 -07:00
memusage.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
mp_clz_tab.c * sysdeps/x86_64/mp_clz_tab.c: New file. 2009-04-15 04:30:41 +00:00
mul_1.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
preconfigure rename configure.in to configure.ac 2013-10-30 17:32:08 +10:00
preconfigure.ac rename configure.in to configure.ac 2013-10-30 17:32:08 +10:00
rawmemchr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
rshift.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sched_cpucount.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setjmp.S Call x86-64 __mcount_internal/__sigjmp_save directly 2016-03-01 16:58:07 -08:00
stack-aliasing.h Clean up stack-coloring macros. 2014-06-20 19:50:16 -07:00
stackguard-macros.h BZ #15754: CVE-2013-4788 2013-09-23 00:52:09 -04:00
stackinfo.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
start.S Always indirect branch to __libc_start_main via GOT 2016-06-09 04:43:31 -07:00
stpcpy.S
strcasecmp_l-nonascii.c Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
strcasecmp_l.S Implement optimized strcaecmp for x86-64. 2010-07-30 00:14:04 -07:00
strcasecmp.S Implement optimized strcaecmp for x86-64. 2010-07-30 00:14:04 -07:00
strcat.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strchr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strchrnul.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strcmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strcpy.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strcspn.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strlen.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strncase_l-nonascii.c Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
strncase_l.S Add optimized strncasecmp versions for x86-64. 2010-08-14 22:04:01 -07:00
strncase.S Add optimized strncasecmp versions for x86-64. 2010-08-14 22:04:01 -07:00
strncmp.S Add SSE2 support to str{,n}cmp for x86-64. 2009-07-26 13:32:28 -07:00
strnlen.S Faster strlen on x64. 2013-03-18 07:39:12 +01:00
strpbrk.S
strrchr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strspn.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strtok_r.S Remove bounded-pointers handling from x86_64 assembly sources. 2013-02-17 21:57:26 +00:00
strtok.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sub_n.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
submul_1.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysdep.h X86_64: Don't use PLT nor GOT in static archives [BZ #20750] 2016-11-28 09:45:07 -08:00
tls-macros.h Split tls-macros.h into sysdeps directories. 2012-07-17 11:30:58 +00:00
tlsdesc.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tlsdesc.sym Introduce TLS descriptors for i386 and x86_64. 2008-05-13 05:41:30 +00:00
tst-audit3.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-audit4-aux.c tst-audit4, tst-audit10: Compile AVX/AVX-512 code separately [BZ #19269] 2016-03-07 16:00:25 +01:00
tst-audit4.c tst-audit4, tst-audit10: Compile AVX/AVX-512 code separately [BZ #19269] 2016-03-07 16:00:25 +01:00
tst-audit5.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-audit6.c Modify several tests to use test-skeleton.c 2015-07-15 15:10:23 +05:30
tst-audit7.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-audit10-aux.c Fix tst-audit10 build when -mavx512f is not supported. 2016-03-08 12:32:59 -08:00
tst-audit10.c tst-audit10: Fix compilation on compilers without bit_AVX512F [BZ #19860] 2016-03-25 11:11:42 +01:00
tst-audit.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-auditmod3a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod3b.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod4a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod4b.c Add la_symbind32 to x86-64 audit tests 2015-07-07 06:09:29 -07:00
tst-auditmod5a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod5b.c Add la_symbind32 to x86-64 audit tests 2015-07-07 06:09:29 -07:00
tst-auditmod6a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod6b.c Add la_symbind32 to x86-64 audit tests 2015-07-07 06:09:29 -07:00
tst-auditmod6c.c Add la_symbind32 to x86-64 audit tests 2015-07-07 06:09:29 -07:00
tst-auditmod7a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod7b.c Add la_symbind32 to x86-64 audit tests 2015-07-07 06:09:29 -07:00
tst-auditmod10a.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-auditmod10b.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-mallocalign1.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-quad1.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-quad1pie.c Handle R_X86_64_RELATIVE64 and R_X86_64_64 for x32 2012-05-10 17:05:06 -07:00
tst-quad2.c Handle R_X86_64_RELATIVE64 and R_X86_64_64 for x32 2012-05-10 17:05:06 -07:00
tst-quad2pie.c Handle R_X86_64_RELATIVE64 and R_X86_64_64 for x32 2012-05-10 17:05:06 -07:00
tst-quadmod1.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-quadmod1pie.S Handle R_X86_64_RELATIVE64 and R_X86_64_64 for x32 2012-05-10 17:05:06 -07:00
tst-quadmod2.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-quadmod2pie.S Handle R_X86_64_RELATIVE64 and R_X86_64_64 for x32 2012-05-10 17:05:06 -07:00
tst-split-dynreloc.c Fix dynamic linker issue with bind-now 2015-08-19 05:37:01 -07:00
tst-split-dynreloc.lds Fix dynamic linker issue with bind-now 2015-08-19 05:37:01 -07:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Versions Work around old buggy program which cannot cope with memcpy semantics. 2011-04-01 19:38:21 -04:00
wcschr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
wcscmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
wcslen.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
wcsrchr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
wordcopy.c X86-64: Add dummy memcopy.h and wordcopy.c 2016-06-09 04:38:34 -07:00