http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56866
--- Comment #9 from Winfried Magerl <winfried.mag...@t-online.de> 2013-04-17
18:41:06 UTC ---
Hi,
at least one confirmation. I've done some further checks about
float-errors in glibc and that FAM/FAM4 are the extension responsible
for the additional float-errors.
How to proceed?
>From my point of view and comapred with '-march=amdfam10' the
extensions XOP/FAM4/FAM are responsible for the failed tests.
Disabling it in gcc-4.8-noxop/gcc/config/i386/i386.c brings me back
to the same test-results I'm seeing with amdfam10 (excluding all
sorts of scan-*-errors).
I would propose the following patch for bdver2-support because
features which are untested and known to break code (like for example
all the additional test-errors in the gcc-testsuite) should be
disabeled:
--- gcc-4.8-noxop/gcc/config/i386/i386.c.orig 2013-04-12 20:49:09.181351855
+0200
+++ gcc-4.8-noxop/gcc/config/i386/i386.c 2013-04-12 23:15:09.112185980
+0200
@@ -2976,9 +2976,9 @@
{"bdver2", PROCESSOR_BDVER2, CPU_BDVER2,
PTA_64BIT | PTA_MMX | PTA_SSE | PTA_SSE2 | PTA_SSE3
| PTA_SSE4A | PTA_CX16 | PTA_ABM | PTA_SSSE3 | PTA_SSE4_1
- | PTA_SSE4_2 | PTA_AES | PTA_PCLMUL | PTA_AVX | PTA_FMA4
- | PTA_XOP | PTA_LWP | PTA_BMI | PTA_TBM | PTA_F16C
- | PTA_FMA | PTA_PRFCHW | PTA_FXSR | PTA_XSAVE},
+ | PTA_SSE4_2 | PTA_AES | PTA_PCLMUL | PTA_AVX
+ | PTA_LWP | PTA_BMI | PTA_TBM | PTA_F16C
+ | PTA_PRFCHW | PTA_FXSR | PTA_XSAVE},
{"bdver3", PROCESSOR_BDVER3, CPU_BDVER3,
PTA_64BIT | PTA_MMX | PTA_SSE | PTA_SSE2 | PTA_SSE3
| PTA_SSE4A | PTA_CX16 | PTA_ABM | PTA_SSSE3 | PTA_SSE4_1
just an examp,e because the features should be disabled in bdver1/3 too
(XOP/FMA4/FMA are only available in bdver1/2/3). Maybe adding the
gcc-developers from @amd.com?
regards
winfried
