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Diffstat (limited to 'results/classifier/qwen3:32b/output/instruction/1605123')
| -rw-r--r-- | results/classifier/qwen3:32b/output/instruction/1605123 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/results/classifier/qwen3:32b/output/instruction/1605123 b/results/classifier/qwen3:32b/output/instruction/1605123 new file mode 100644 index 00000000..f79f6cad --- /dev/null +++ b/results/classifier/qwen3:32b/output/instruction/1605123 @@ -0,0 +1,31 @@ + + + +PEXT returns wrong values, seemingly switches arguments + +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. + +$ qemu-x86_64 --version +qemu-x86_64 version 2.6.50 (v2.6.0-2095-ge66b05e-dirty), Copyright (c) 2003-2008 Fabrice Bellard + +$ uname -a +Linux lenard-hp 4.3.0-1-amd64 #1 SMP Debian 4.3.5-1 (2016-02-06) x86_64 GNU/Linux + +I compiled the attached file with the command line "gcc -o main -g -mbmi2 main.c". + +$ gcc --version +gcc (Debian 5.4.0-6) 5.4.0 20160609 + +Best regards, +Lénárd Szolnoki \ No newline at end of file |