on 08/10/2012 10:52 malc said the following: > On Mon, 8 Oct 2012, Andriy Gapon wrote: > >> >> I am running Qemu (plain, no kvm, etc) on an AMD 10h machine that >> provides popcnt instruction. Qemu advertises availability of pocnt >> to a guest as well. What I see in the guest that popcnt >> 0x20(%r12),%r8 instruction actually placed its result into %rax. >> With %rdi and %rax operands the instruction worked fine though. >> >> > > Does following work?
It does! Thank you very much. > diff --git a/target-i386/translate.c b/target-i386/translate.c > index e896abf..c36cc3e 100644 > --- a/target-i386/translate.c > +++ b/target-i386/translate.c > @@ -7818,7 +7818,7 @@ static target_ulong disas_insn(DisasContext *s, > target_ulong pc_start) > goto illegal_op; > > modrm = cpu_ldub_code(cpu_single_env, s->pc++); > - reg = ((modrm >> 3) & 7); > + reg = ((modrm >> 3) & 7) | rex_r; > > if (s->prefix & PREFIX_DATA) > ot = OT_WORD; > -- Andriy Gapon
