KVM: x86 emulator: simplify two-byte opcode check

Two-byte opcode always start with 0x0F and the decode flags of opcode 0xF0 is always 0, so remove dup check. Signed-off-by: Wei Yongjun <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
Baughn · Oct 24, 2010 · d3ad624 · d3ad624
1 parent a58ddea
commit d3ad624
Showing 1 changed file with 5 additions and 7 deletions.
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
@@ -2375,13 +2375,11 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt)
 
 	/* Opcode byte(s). */
 	opcode = opcode_table[c->b];
-	if (opcode.flags == 0) {
-		/* Two-byte opcode? */
-		if (c->b == 0x0f) {
-			c->twobyte = 1;
-			c->b = insn_fetch(u8, 1, c->eip);
-			opcode = twobyte_table[c->b];
-		}
+	/* Two-byte opcode? */
+	if (c->b == 0x0f) {
+		c->twobyte = 1;
+		c->b = insn_fetch(u8, 1, c->eip);
+		opcode = twobyte_table[c->b];
 	}
 	c->d = opcode.flags;