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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-08 13:28:15 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-08 13:28:28 +0200 |
| commit | 5aa276efcbd67f4300ca1a7f809c6e00aadb03da (patch) | |
| tree | 9b8f0e074014cda8d42f5a97a95bc25082d8b764 /results/classifier/zero-shot-user-mode/instruction/1841990 | |
| parent | 1a3c4faf4e0a25ed0b86e8739d5319a634cb9112 (diff) | |
| download | emulator-bug-study-5aa276efcbd67f4300ca1a7f809c6e00aadb03da.tar.gz emulator-bug-study-5aa276efcbd67f4300ca1a7f809c6e00aadb03da.zip | |
restructure results
Diffstat (limited to 'results/classifier/zero-shot-user-mode/instruction/1841990')
| -rw-r--r-- | results/classifier/zero-shot-user-mode/instruction/1841990 | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/results/classifier/zero-shot-user-mode/instruction/1841990 b/results/classifier/zero-shot-user-mode/instruction/1841990 new file mode 100644 index 00000000..d309686e --- /dev/null +++ b/results/classifier/zero-shot-user-mode/instruction/1841990 @@ -0,0 +1,44 @@ +instruction: 0.753 +syscall: 0.136 +runtime: 0.111 + + + +instruction 'denbcdq' misbehaving + +Instruction 'denbcdq' appears to have no effect. Test case attached. + +On ppc64le native: +-- +gcc -g -O -mcpu=power9 bcdcfsq.c test-denbcdq.c -o test-denbcdq +$ ./test-denbcdq +0x00000000000000000000000000000000 +0x0000000000000000000000000000000c +0x22080000000000000000000000000000 +$ ./test-denbcdq 1 +0x00000000000000000000000000000001 +0x0000000000000000000000000000001c +0x22080000000000000000000000000001 +$ ./test-denbcdq $(seq 0 99) +0x00000000000000000000000000000064 +0x0000000000000000000000000000100c +0x22080000000000000000000000000080 +-- + +With "qemu-ppc64le -cpu power9" +-- +$ qemu-ppc64le -cpu power9 -L [...] ./test-denbcdq +0x00000000000000000000000000000000 +0x0000000000000000000000000000000c +0x0000000000000000000000000000000c +$ qemu-ppc64le -cpu power9 -L [...] ./test-denbcdq 1 +0x00000000000000000000000000000001 +0x0000000000000000000000000000001c +0x0000000000000000000000000000001c +$ qemu-ppc64le -cpu power9 -L [...] ./test-denbcdq $(seq 100) +0x00000000000000000000000000000064 +0x0000000000000000000000000000100c +0x0000000000000000000000000000100c +-- + +I started looking at the code, but I got confused rather quickly. Could be related to endianness? I think denbcdq arrived on the scene before little-endian was a big deal. Maybe something to do with utilizing implicit floating-point register pairs... I don't think the right data is getting to helper_denbcdq, which would point back to the gen_fprp_ptr uses in dfp-impl.inc.c (GEN_DFP_T_FPR_I32_Rc). (Maybe?)
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