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Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index ec06954..9c1a463 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -7466,7 +7466,11 @@ fold_plusminus_mult_expr (enum tree_code code, tree type, tree arg0, tree arg1) else maybe_same = arg11; - if (exact_log2 (abs (int11)) > 0 && int01 % int11 == 0) + if (exact_log2 (abs (int11)) > 0 && int01 % int11 == 0 + /* The remainder should not be a constant, otherwise we + end up folding i * 4 + 2 to (i * 2 + 1) * 2 which has + increased the number of multiplications necessary. */ + && TREE_CODE (arg10) != INTEGER_CST) { alt0 = fold_build2 (MULT_EXPR, TREE_TYPE (arg00), arg00, build_int_cst (TREE_TYPE (arg00), |