diff options
| author | pinskia <pinskia@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-11-27 21:31:36 +0000 |
|---|---|---|
| committer | pinskia <pinskia@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-11-27 21:31:36 +0000 |
| commit | 212f6d6d5ed26eb3192806ee6bfe9ee11ff65348 (patch) | |
| tree | b7fdf4f01178be8199203636f4b7c9cb41de7ae9 /gcc/fold-const.c | |
| parent | 065b42aa8a350788ab6c21c754bbbe9b63a97467 (diff) | |
| download | gcc-212f6d6d5ed26eb3192806ee6bfe9ee11ff65348.tar.gz | |
2005-11-27 Andrew Pinski <pinskia@physics.uc.edu>
PR middle-end/24575
* fold-const.c (negate_expr_p): Add case for signed divides if overflow
is undefined.
(negate_expr): Likewise.
2005-11-27 Andrew Pinski <pinskia@physics.uc.edu>
PR middle-end/24575
* gcc.dg/tree-ssa/divide-3.c: New test.
* gcc.dg/tree-ssa/divide-4.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@107575 138bc75d-0d04-0410-961f-82ee72b054a4
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) |