diff options
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 63f12949ab7..45863ee77e3 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -991,6 +991,16 @@ negate_expr_p (tree t) || negate_expr_p (TREE_OPERAND (t, 0)); break; + case TRUNC_DIV_EXPR: + case ROUND_DIV_EXPR: + case FLOOR_DIV_EXPR: + case CEIL_DIV_EXPR: + case EXACT_DIV_EXPR: + if (TYPE_UNSIGNED (TREE_TYPE (t)) || flag_wrapv) + break; + return negate_expr_p (TREE_OPERAND (t, 1)) + || negate_expr_p (TREE_OPERAND (t, 0)); + case NOP_EXPR: /* Negate -((double)float) as (double)(-float). */ if (TREE_CODE (type) == REAL_TYPE) @@ -1132,6 +1142,28 @@ negate_expr (tree t) } break; + case TRUNC_DIV_EXPR: + case ROUND_DIV_EXPR: + case FLOOR_DIV_EXPR: + case CEIL_DIV_EXPR: + case EXACT_DIV_EXPR: + if (!TYPE_UNSIGNED (TREE_TYPE (t)) && !flag_wrapv) + { + tem = TREE_OPERAND (t, 1); + if (negate_expr_p (tem)) + return fold_convert (type, + fold_build2 (TREE_CODE (t), TREE_TYPE (t), + TREE_OPERAND (t, 0), + negate_expr (tem))); + tem = TREE_OPERAND (t, 0); + if (negate_expr_p (tem)) + return fold_convert (type, + fold_build2 (TREE_CODE (t), TREE_TYPE (t), + negate_expr (tem), + TREE_OPERAND (t, 1))); + } + break; + case NOP_EXPR: /* Convert -((double)float) into (double)(-float). */ if (TREE_CODE (type) == REAL_TYPE) |