* [Qemu-devel] PEXT returns wrong values, seemingly switches arguments
@ 2016-07-20 10:45 Szolnoki Lénárd
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From: Szolnoki Lénárd @ 2016-07-20 10:45 UTC (permalink / raw)
To: qemu-devel; +Cc: rth
Hi,
I fiddled with BMI2 instructions and discovered that pext instructions
emulated with "qemu-x86_64 -cpu Haswell" return the wrong value. It
seemingly switches up its arguments. I suspect that the error is around the
gen_helper_pext(..) call in target-i386/translate.c. I checked helper_pext
in target-i386/int_helper.c and it works fine.
I ran my program on a CPU with BMI2 instruction set too, and it indeed
returns different values.
I didn't check pdep, it could have the same problem.
Best regards,
Lénárd Szolnoki
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2016-07-20 10:45 [Qemu-devel] PEXT returns wrong values, seemingly switches arguments Szolnoki Lénárd
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