+2005-09-17 David Edelsohn <edelsohn@gnu.org>
+
+ PR middle-end/22067
+ * expmed.c (expand_mult): Substitute simple register for op0 when
+ computing max_cost.
+
2005-09-17 Richard Henderson <rth@redhat.com>
* expr.c (emit_move_via_integer): Add force argument, pass it on
&& (unsignedp || !flag_trapv))
{
HOST_WIDE_INT coeff = 0;
+ rtx reg = gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 1);
/* synth_mult does an `unsigned int' multiply. As long as the mode is
less than or equal in size to `unsigned int' this doesn't matter.
{
/* Its safe to use -INTVAL (op1) even for INT_MIN, as the
result is interpreted as an unsigned coefficient. */
- max_cost = rtx_cost (gen_rtx_MULT (mode, op0, op1), SET)
+ max_cost = rtx_cost (gen_rtx_MULT (mode, reg, op1), SET)
- neg_cost[mode];
if (max_cost > 0
&& choose_mult_variant (mode, -INTVAL (op1), &algorithm,
build_int_cst (NULL_TREE, floor_log2 (coeff)),
target, unsignedp);
- max_cost = rtx_cost (gen_rtx_MULT (mode, op0, op1), SET);
+ max_cost = rtx_cost (gen_rtx_MULT (mode, reg, op1), SET);
if (choose_mult_variant (mode, coeff, &algorithm, &variant,
max_cost))
return expand_mult_const (mode, op0, coeff, target,