diff options
Diffstat (limited to 'src/emu')
| -rw-r--r-- | src/emu/x64run66f30f.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/emu/x64run66f30f.c b/src/emu/x64run66f30f.c index dd466ad5..4e455d7c 100644 --- a/src/emu/x64run66f30f.c +++ b/src/emu/x64run66f30f.c @@ -56,6 +56,24 @@ uintptr_t Run66F30F(x64emu_t *emu, rex_t rex, uintptr_t addr) switch(opcode) { + case 0xBD: /* LZCNT Ed,Gd */ + CHECK_FLAGS(emu); + nextop = F8; + GETEW(0); + GETGW; + if(rex.w) { + tmp64u = ED->q[0]; + tmp8u = (tmp64u)?__builtin_clzl(tmp64u):64; + CONDITIONAL_SET_FLAG(tmp8u==0, F_ZF); + CONDITIONAL_SET_FLAG(tmp8u==64, F_CF); + } else { + tmp32u = EW->word[0]; + tmp8u = (tmp32u)?__builtin_clz(tmp32u<<16):16; + CONDITIONAL_SET_FLAG(tmp8u==0, F_ZF); + CONDITIONAL_SET_FLAG(tmp8u==16, F_CF); + } + GD->q[0] = tmp8u; + break; default: return 0; |