Only read the in-reg of a Cmp8Bit, if there is a register.

[libfirm] / ir / be / ia32 / ia32_emitter.c

diff --git a/ir/be/ia32/ia32_emitter.c b/ir/be/ia32/ia32_emitter.c
index b649b15..73e3882 100644 (file)
--- a/ir/be/ia32/ia32_emitter.c
+++ b/ir/be/ia32/ia32_emitter.c
@@ -2776,21 +2776,24 @@ SHIFT(sar, 7)
 
 static void bemit_cmp8bit(const ir_node *node)
 {
-       const arch_register_t *out   = get_in_reg(node, n_ia32_Cmp_left);
-       ir_node               *right = get_irn_n(node, n_ia32_binary_right);
+       ir_node *right = get_irn_n(node, n_ia32_binary_right);
        if (is_ia32_Immediate(right)) {
-               if (get_ia32_op_type(node) != ia32_Normal) {
-                       bemit8(0x80);
-                       bemit_mod_am(7, node);
-               } else if (out->index == REG_EAX) {
-                       bemit8(0x3C);
+               if (get_ia32_op_type(node) == ia32_Normal) {
+                       const arch_register_t *out = get_in_reg(node, n_ia32_Cmp_left);
+                       if (out->index == REG_EAX) {
+                               bemit8(0x3C);
+                       } else {
+                               bemit8(0x80);
+                               bemit_modru(out, 7);
+                       }
                } else {
                        bemit8(0x80);
-                       bemit_modru(out, 7);
+                       bemit_mod_am(7, node);
                }
                bemit8(get_ia32_immediate_attr_const(right)->offset);
        } else {
                bemit8(0x3A);
+               const arch_register_t *out = get_in_reg(node, n_ia32_Cmp_left);
                if (get_ia32_op_type(node) == ia32_Normal) {
                        const arch_register_t *in = get_in_reg(node, n_ia32_Cmp_right);
                        bemit_modrr(out, in);