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KVM: x86 emulator: simplify sib decoding

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Instead of using sparse switches, use simpler if/else sequences.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-06-15 21:23:17 -07:00
parent 8684c0af0b
commit dc71d0f162
1 changed files with 4 additions and 16 deletions
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20
arch/x86/kvm/x86_emulate.c
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@ -748,24 +748,12 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
base_reg |= sib & 7;
scale = sib >> 6;
switch (base_reg) {
case 5:
case 13:
if (c->modrm_mod != 0)
c->modrm_ea += c->regs[base_reg];
else
c->modrm_ea +=
insn_fetch(s32, 4, c->eip);
break;
default:
if ((base_reg & 7) == 5 && c->modrm_mod == 0)
c->modrm_ea += insn_fetch(s32, 4, c->eip);
else
c->modrm_ea += c->regs[base_reg];
}
switch (index_reg) {
case 4:
break;
default:
if (index_reg != 4)
c->modrm_ea += c->regs[index_reg] << scale;
}
break;
case 5:
case 13: