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| author | Alan Wu <XrXr@users.noreply.github.com> | 2021-03-03 18:06:49 -0500 |
|---|---|---|
| committer | Alan Wu <XrXr@users.noreply.github.com> | 2021-10-20 18:19:30 -0400 |
| commit | eccf4bcd91c2f10b156f07187267040f866e6a0f (patch) | |
| tree | 1a92de2dc774b2af96aad076da0e6e98852e0124 /ujit_asm.c | |
| parent | 8302eb57b0492a5ebd021536f0f3a00b95694bf8 (diff) | |
| download | ruby-eccf4bcd91c2f10b156f07187267040f866e6a0f.tar.gz | |
uJIT: support 64 bit operands for TEST. Use it to check for zero
It's one byte shorter than `cmp reg64, 0`. To illustrate:
```
48 83 f9 00 cmp rcx, 0x0
48 85 c9 test rcx, rcx
```
Diffstat (limited to 'ujit_asm.c')
| -rw-r--r-- | ujit_asm.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/ujit_asm.c b/ujit_asm.c index 3eea61cf69..939f238b0e 100644 --- a/ujit_asm.c +++ b/ujit_asm.c @@ -1609,10 +1609,8 @@ void test(codeblock_t* cb, x86opnd_t rm_opnd, x86opnd_t test_opnd) } else { - // For now, 32-bit operands only assert (test_opnd.num_bits == rm_opnd.num_bits); - assert (test_opnd.num_bits == 32); - cb_write_rm(cb, false, false, test_opnd, rm_opnd, 0xFF, 1, 0x85); + cb_write_rm(cb, false, rm_opnd.num_bits == 64, test_opnd, rm_opnd, 0xFF, 1, 0x85); } } |