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| author | Paolo Bonzini <pbonzini@redhat.com> | 2023-05-09 16:17:15 +0200 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2023-05-18 20:46:47 +0300 |
| commit | db8051ad59f416a91ad4121d3d11f52e2879c429 (patch) | |
| tree | bea9e74c8b66516a57ea2ddc85a7ef0cdcb61de1 /module-common.c | |
| parent | 1e029102e6b6b176d692944d9df94c6b46185912 (diff) | |
target/i386: fix operand size for VCOMI/VUCOMI instructions
Compared to other SSE instructions, VUCOMISx and VCOMISx are different:
the single and double precision versions are distinguished through a
prefix, however they use no-prefix and 0x66 for SS and SD respectively.
Scalar values usually are associated with 0xF2 and 0xF3.
Because of these, they incorrectly perform a 128-bit memory load instead
of a 32- or 64-bit load. Fix this by writing a custom decoding function.
I tested that the reproducer is fixed and the test-avx output does not
change.
Reported-by: Gabriele Svelto <gsvelto@mozilla.com>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1637
Fixes: f8d19eec0d53 ("target/i386: reimplement 0x0f 0x28-0x2f, add AVX", 2022-10-18)
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 2b55e479e6fcbb466585fd25077a50c32e10dc3a)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'module-common.c')
0 files changed, 0 insertions, 0 deletions