- do not use imul mem, imm32 on newer AMD cpu's

[libfirm] / ir / be / ia32 / ia32_transform.c

diff --git a/ir/be/ia32/ia32_transform.c b/ir/be/ia32/ia32_transform.c
index 41ae349..74c29cd 100644 (file)
--- a/ir/be/ia32/ia32_transform.c
+++ b/ir/be/ia32/ia32_transform.c
@@ -1152,6 +1152,7 @@ static ir_node *gen_Mul(ir_node *node) {
        ir_node *op1  = get_Mul_left(node);
        ir_node *op2  = get_Mul_right(node);
        ir_mode *mode = get_irn_mode(node);
+       unsigned flags;
 
        if (mode_is_float(mode)) {
                if (ia32_cg_config.use_sse2)
@@ -1165,9 +1166,10 @@ static ir_node *gen_Mul(ir_node *node) {
        /* for the lower 32bit of the result it doesn't matter whether we use
         * signed or unsigned multiplication so we use IMul as it has fewer
         * constraints */
-       return gen_binop(node, op1, op2, new_rd_ia32_IMul,
-                        match_commutative | match_am | match_mode_neutral |
-                        match_immediate | match_am_and_immediates);
+       flags = match_commutative | match_am | match_mode_neutral | match_immediate;
+       if (ia32_cg_config.use_imul_mem_imm32)
+               flags |= match_am_and_immediates;
+       return gen_binop(node, op1, op2, new_rd_ia32_IMul, flags);
 }
 
 /**