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avx2 configure: Use primitives in test

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Use the avx2 primitives during the test, thus making sure that the
compiler and assembler could actually use avx2.

This also detects the failure case on gcc 4.8.x with -save-temps
and avoids the need for the gcc version check in cutils.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <1465557378-24105-3-git-send-email-dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2016-06-10 12:16:18 +01:00 committed by Paolo Bonzini
parent fc6e1de9d8
commit 4fb8320a2e
2 changed files with 13 additions and 12 deletions
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17
configure vendored
View File

@ -1779,13 +1779,20 @@ fi
# avx2 optimization requirement check
cat > $TMPC << EOF
static void bar(void) {}
#pragma GCC push_options
#pragma GCC target("avx2")
#include <cpuid.h>
#include <immintrin.h>
static int bar(void *a) {
return _mm256_movemask_epi8(_mm256_cmpeq_epi8(*(__m256i *)a, (__m256i){0}));
}
static void *bar_ifunc(void) {return (void*) bar;}
void foo(void) __attribute__((ifunc("bar_ifunc")));
int main(void) { foo(); return 0; }
int foo(void *a) __attribute__((ifunc("bar_ifunc")));
int main(int argc, char *argv[]) { return foo(argv[0]);}
EOF
if compile_prog "-mavx2" "" ; then
if readelf --syms $TMPE |grep "IFUNC.*foo" >/dev/null 2>&1; then
if compile_object "" ; then
if readelf --syms $TMPO |grep "IFUNC.*foo" >/dev/null 2>&1; then
avx2_opt="yes"
fi
fi

8
util/cutils.c
View File

@ -256,13 +256,7 @@ static size_t buffer_find_nonzero_offset_inner(const void *buf, size_t len)
return i * sizeof(VECTYPE);
}
/*
* GCC before version 4.9 has a bug which will cause the target
* attribute work incorrectly and failed to compile in some case,
* restrict the gcc version to 4.9+ to prevent the failure.
*/
#if defined CONFIG_AVX2_OPT && QEMU_GNUC_PREREQ(4, 9)
#if defined CONFIG_AVX2_OPT
#pragma GCC push_options
#pragma GCC target("avx2")
#include <cpuid.h>