glibc/sysdeps/powerpc
Joseph Myers f4015c8a86 Use generic fdim on more architectures (bug 6796, bug 20255, bug 20256).
Some architectures have their own versions of fdim functions, which
are missing errno setting (bug 6796) and may also return sNaN instead
of qNaN for sNaN input, in the case of the x86 / x86_64 long double
versions (bug 20256).

These versions are not actually doing anything that a compiler
couldn't generate, just straightforward comparisons / arithmetic (and,
in the x86 / x86_64 case, testing for NaNs with fxam, which isn't
actually needed once you use an unordered comparison and let the NaNs
pass through the same subtraction as non-NaN inputs).  This patch
removes the x86 / x86_64 / powerpc versions, so that those
architectures use the generic C versions, which correctly handle
setting errno and deal properly with sNaN inputs.  This seems better
than dealing with setting errno in lots of .S versions.

The i386 versions also return results with excess range and precision,
which is not appropriate for a function exactly defined by reference
to IEEE operations.  For errno setting to work correctly on overflow,
it's necessary to remove excess range with math_narrow_eval, which
this patch duly does in the float and double versions so that the
tests can reliably pass on x86.  For float, this avoids any double
rounding issues as the long double precision is more than twice that
of float.  For double, double rounding issues will need to be
addressed separately, so this patch does not fully fix bug 20255.

Tested for x86_64, x86 and powerpc.

	[BZ #6796]
	[BZ #20255]
	[BZ #20256]
	* math/s_fdim.c: Include <math_private.h>.
	(__fdim): Use math_narrow_eval on result.
	* math/s_fdimf.c: Include <math_private.h>.
	(__fdimf): Use math_narrow_eval on result.
	* sysdeps/i386/fpu/s_fdim.S: Remove file.
	* sysdeps/i386/fpu/s_fdimf.S: Likewise.
	* sysdeps/i386/fpu/s_fdiml.S: Likewise.
	* sysdeps/i386/i686/fpu/s_fdim.S: Likewise.
	* sysdeps/i386/i686/fpu/s_fdimf.S: Likewise.
	* sysdeps/i386/i686/fpu/s_fdiml.S: Likewise.
	* sysdeps/powerpc/fpu/s_fdim.c: Likewise.
	* sysdeps/powerpc/fpu/s_fdimf.c: Likewise.
	* sysdeps/powerpc/powerpc32/fpu/s_fdim.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_fdim.c: Likewise.
	* sysdeps/x86_64/fpu/s_fdiml.S: Likewise.
	* math/libm-test.inc (fdim_test_data): Expect errno setting on
	overflow.  Add sNaN tests.
2016-06-14 16:04:19 +00:00
..
bits powerpc: Remove uses of operand modifier (%s) in inline asm 2016-03-08 15:30:28 -03:00
fpu Use generic fdim on more architectures (bug 6796, bug 20255, bug 20256). 2016-06-14 16:04:19 +00:00
nofpu Fix ulps regeneration for *-finite tests. 2016-01-19 21:42:58 +00:00
nptl powerpc: Enforce compiler barriers on hardware transactions 2016-01-08 17:47:33 -02:00
power4 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
power5+/fpu Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
power6 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
power7/fpu Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
powerpc32 Use generic fdim on more architectures (bug 6796, bug 20255, bug 20256). 2016-06-14 16:04:19 +00:00
powerpc64 Use generic fdim on more architectures (bug 6796, bug 20255, bug 20256). 2016-06-14 16:04:19 +00:00
soft-fp soft-fp: support after-rounding tininess detection. 2014-02-12 18:27:12 +00:00
sys/platform Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
abort-instr.h Update. 2002-09-15 18:31:23 +00:00
atomic-machine.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-procinfo.c powerpc: Fix dl-procinfo HWCAP 2016-03-08 15:30:06 -03:00
dl-procinfo.h powerpc: Fix dl-procinfo HWCAP 2016-03-08 15:30:06 -03:00
dl-tls.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-tls.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ffs.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
fpu_control.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
gccframe.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
hwcapinfo.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
hwcapinfo.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ifunc-sel.h Move sysdeps/powerpc/elf files 2012-03-28 09:25:31 +02:00
Implies PowerPC: unify math_ldbl.h implementations 2013-03-08 11:07:15 -03:00
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
ldsodefs.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
libc-tls.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
locale-defines.sym powerpc: strcasestr optmization for power8 2016-04-22 19:23:13 +05:30
longjmp.c 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 powerpc: Add hwcap/hwcap2/platform data to TCB. 2015-12-03 13:56:13 -02:00
math-tests.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
memusage.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
mp_clz_tab.c Update. 2002-03-14 20:48:50 +00:00
novmx-longjmp.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
novmx-sigjmp.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
novmxsetjmp.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
preconfigure Move base_machine and machine settings from configure.ac to sysdeps preconfigure fragments. 2014-06-25 17:52:56 +00:00
rtld-global-offsets.sym PowerPC: Define AT_HWCAP2 bits and AT_HWCAP2 handling for POWER8. 2013-06-28 16:52:49 -05:00
sched_cpucount.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigjmp.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sotruss-lib.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
stackinfo.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strcat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysdep.h powerpc: Enforce compiler barriers on hardware transactions 2016-01-08 17:47:33 -02:00
test-arith.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
test-arithf.c Update. 1997-08-10 18:37:15 +00:00
test-get_hwcap-static.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
test-get_hwcap.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
test-gettimebase.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tls-macros.h Split tls-macros.h in sysdeps directories. 2012-07-19 17:04:04 -03:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-tlsopt-powerpc.c powerpc __tls_get_addr call optimization 2015-03-25 15:53:47 +10:30
Versions powerpc: Add hwcap/hwcap2/platform data to TCB. 2015-12-03 13:56:13 -02:00