[Bug target/85100] __builtin_cpu_supports avx does not verify OS supports it

Mon, 02 Apr 2018 05:04:15 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85100

--- Comment #10 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr  2 12:03:16 2018
New Revision: 259006

URL: https://gcc.gnu.org/viewcvs?rev=259006&root=gcc&view=rev
Log:
i386: Enable AVX/AVX512 features only if supported by OSXSAVE

Enable AVX and AVX512 features only if their states are supported by
OSXSAVE.

        Backport from mainline
        PR target/85100
        * config/i386/cpuinfo.c (XCR_XFEATURE_ENABLED_MASK): New.
        (XSTATE_FP): Likewise.
        (XSTATE_SSE): Likewise.
        (XSTATE_YMM): Likewise.
        (XSTATE_OPMASK): Likewise.
        (XSTATE_ZMM): Likewise.
        (XSTATE_HI_ZMM): Likewise.
        (XCR_AVX_ENABLED_MASK): Likewise.
        (XCR_AVX512F_ENABLED_MASK): Likewise.
        (get_available_features): Enable AVX and AVX512 features only
        if their states are supported by OSXSAVE.

Modified:
    branches/gcc-7-branch/libgcc/ChangeLog
    branches/gcc-7-branch/libgcc/config/i386/cpuinfo.c

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