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x86/x64: Fix instruction length decoder.

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Thanks to Peter Cawley.
This commit is contained in:
Mike Pall 2016-05-06 12:08:00 +02:00
parent 7b26e9c998
commit f05280e415
1 changed files with 3 additions and 3 deletions
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6
src/lj_asm_x86.h
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@ -2836,9 +2836,9 @@ static uint32_t asm_x86_inslen(const uint8_t* p)
case 4: result -= (prefixes & 2); /* fallthrough */
case 5: return result + (x & 15);
case 6: /* Group 3. */
if (p[1] & 0x38) return result + 2;
if ((prefixes & 2) && (x == 0x66)) return result + 4;
return result + (x & 15);
if (p[1] & 0x38) x = 2;
else if ((prefixes & 2) && (x == 0x66)) x = 4;
goto mrm;
case 7: /* VEX c4/c5. */
if (LJ_32 && p[1] < 0xc0) {
x = 2;