diff options
| author | Bandan Das <bsd@redhat.com> | 2014-04-16 20:46:11 +0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-07-11 11:14:00 +0400 |
| commit | 02357bdc8c30a60cd33dd438f851c1306c34f435 (patch) | |
| tree | d74663db7274e8e387554d0373d0c844b96ddba2 | |
| parent | 685bbf4ac406364a84a1d4237b4970dc570fd4cb (diff) | |
| download | linux-02357bdc8c30a60cd33dd438f851c1306c34f435.tar.xz | |
KVM: emulate: cleanup decode_modrm
Remove the if conditional - that will help us avoid
an "else initialize to 0" Also, rearrange operators
for slightly better code.
Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 000fc7398832..94f5f8b94ce9 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1066,19 +1066,17 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt, struct operand *op) { u8 sib; - int index_reg = 0, base_reg = 0, scale; + int index_reg, base_reg, scale; int rc = X86EMUL_CONTINUE; ulong modrm_ea = 0; - if (ctxt->rex_prefix) { - ctxt->modrm_reg = (ctxt->rex_prefix & 4) << 1; /* REX.R */ - index_reg = (ctxt->rex_prefix & 2) << 2; /* REX.X */ - ctxt->modrm_rm = base_reg = (ctxt->rex_prefix & 1) << 3; /* REG.B */ - } + ctxt->modrm_reg = ((ctxt->rex_prefix << 1) & 8); /* REX.R */ + index_reg = (ctxt->rex_prefix << 2) & 8; /* REX.X */ + base_reg = (ctxt->rex_prefix << 3) & 8; /* REX.B */ - ctxt->modrm_mod |= (ctxt->modrm & 0xc0) >> 6; + ctxt->modrm_mod = (ctxt->modrm & 0xc0) >> 6; ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3; - ctxt->modrm_rm |= (ctxt->modrm & 0x07); + ctxt->modrm_rm = base_reg | (ctxt->modrm & 0x07); ctxt->modrm_seg = VCPU_SREG_DS; if (ctxt->modrm_mod == 3 || (ctxt->d & NoMod)) { |