diff options
Diffstat (limited to 'gcc/tree-ssa-loop-ivopts.c')
| -rw-r--r-- | gcc/tree-ssa-loop-ivopts.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/tree-ssa-loop-ivopts.c b/gcc/tree-ssa-loop-ivopts.c index 220aae6878b..f7da1267416 100644 --- a/gcc/tree-ssa-loop-ivopts.c +++ b/gcc/tree-ssa-loop-ivopts.c @@ -3500,17 +3500,21 @@ get_shiftadd_cost (tree expr, enum machine_mode mode, comp_cost cost0, int m = exact_log2 (int_cst_value (cst)); int maxm = MIN (BITS_PER_WORD, GET_MODE_BITSIZE (mode)); int sa_cost; + bool equal_p = false; if (!(m >= 0 && m < maxm)) return false; + if (operand_equal_p (op1, mult, 0)) + equal_p = true; + sa_cost = (TREE_CODE (expr) != MINUS_EXPR ? shiftadd_cost (speed, mode, m) - : (mult == op1 + : (equal_p ? shiftsub1_cost (speed, mode, m) : shiftsub0_cost (speed, mode, m))); res = new_cost (sa_cost, 0); - res = add_costs (res, mult == op1 ? cost0 : cost1); + res = add_costs (res, equal_p ? cost0 : cost1); STRIP_NOPS (multop); if (!is_gimple_val (multop)) |