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[Bug libc/12460] New: AVX audit test failures with gcc 4.6


http://sourceware.org/bugzilla/show_bug.cgi?id=12460

           Summary: AVX audit test failures with gcc 4.6
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: hjl.tools@gmail.com


On Linux/x86-64, gcc 4.6.0 gave:

/bin/sh: line 1:  9941 Illegal instruction    
GCONV_PATH=/export/build/gnu/glibc/build-x86_64-linux/iconvdata LC_ALL=C
LD_AUDIT=/export/build/gnu/glibc/build-x86_64-linux/elf/tst-auditmod4b.so
/export/build/gnu/glibc/build-x86_64-linux/elf/ld-linux-x86-64.so.2
--library-path
/export/build/gnu/glibc/build-x86_64-linux:/export/build/gnu/glibc/build-x86_64-linux/math:/export/build/gnu/glibc/build-x86_64-linux/elf:/export/build/gnu/glibc/build-x86_64-linux/dlfcn:/export/build/gnu/glibc/build-x86_64-linux/nss:/export/build/gnu/glibc/build-x86_64-linux/nis:/export/build/gnu/glibc/build-x86_64-linux/rt:/export/build/gnu/glibc/build-x86_64-linux/resolv:/export/build/gnu/glibc/build-x86_64-linux/crypt:/export/build/gnu/glibc/build-x86_64-linux/nptl
/export/build/gnu/glibc/build-x86_64-linux/elf/tst-audit4 >
/export/build/gnu/glibc/build-x86_64-linux/elf/tst-audit4.out
/bin/sh: line 1:  9952 Illegal instruction    
GCONV_PATH=/export/build/gnu/glibc/build-x86_64-linux/iconvdata LC_ALL=C
LD_AUDIT=/export/build/gnu/glibc/build-x86_64-linux/elf/tst-auditmod7b.so
/export/build/gnu/glibc/build-x86_64-linux/elf/ld-linux-x86-64.so.2
--library-path
/export/build/gnu/glibc/build-x86_64-linux:/export/build/gnu/glibc/build-x86_64-linux/math:/export/build/gnu/glibc/build-x86_64-linux/elf:/export/build/gnu/glibc/build-x86_64-linux/dlfcn:/export/build/gnu/glibc/build-x86_64-linux/nss:/export/build/gnu/glibc/build-x86_64-linux/nis:/export/build/gnu/glibc/build-x86_64-linux/rt:/export/build/gnu/glibc/build-x86_64-linux/resolv:/export/build/gnu/glibc/build-x86_64-linux/crypt:/export/build/gnu/glibc/build-x86_64-linux/nptl
/export/build/gnu/glibc/build-x86_64-linux/elf/tst-audit7 >
/export/build/gnu/glibc/build-x86_64-linux/elf/tst-audit7.out
/bin/sh: line 1:  9951 Illegal instruction    
GCONV_PATH=/export/build/gnu/glibc/build-x86_64-linux/iconvdata LC_ALL=C
LD_AUDIT=/export/build/gnu/glibc/build-x86_64-linux/elf/tst-auditmod6b.so:/export/build/gnu/glibc/build-x86_64-linux/elf/tst-auditmod6c.so
/export/build/gnu/glibc/build-x86_64-linux/elf/ld-linux-x86-64.so.2
--library-path
/export/build/gnu/glibc/build-x86_64-linux:/export/build/gnu/glibc/build-x86_64-linux/math:/export/build/gnu/glibc/build-x86_64-linux/elf:/export/build/gnu/glibc/build-x86_64-linux/dlfcn:/export/build/gnu/glibc/build-x86_64-linux/nss:/export/build/gnu/glibc/build-x86_64-linux/nis:/export/build/gnu/glibc/build-x86_64-linux/rt:/export/build/gnu/glibc/build-x86_64-linux/resolv:/export/build/gnu/glibc/build-x86_64-linux/crypt:/export/build/gnu/glibc/build-x86_64-linux/nptl
/export/build/gnu/glibc/build-x86_64-linux/elf/tst-audit6 >
/export/build/gnu/glibc/build-x86_64-linux/elf/tst-audit6.out

Gcc 4.5 is OK.  This is caused by the vzeroupper optimization in
gcc 4.6. Gcc will add vzeroupper before function return even if AVX
isn't supported. Due to nature of special codes in AVX audit tests,
we can't use __builtin_ia32_vzeroupper in AVX audit tests.  We need
to add -mno-vzeroupper for those tests if needed.

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