diff options
Diffstat (limited to 'gcc/tree-chrec.c')
| -rw-r--r-- | gcc/tree-chrec.c | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/gcc/tree-chrec.c b/gcc/tree-chrec.c index 924df04..896ff35 100644 --- a/gcc/tree-chrec.c +++ b/gcc/tree-chrec.c @@ -295,8 +295,23 @@ chrec_fold_plus_1 (enum tree_code code, tree type, return chrec_fold_plus_poly_poly (code, type, op0, op1); CASE_CONVERT: - if (tree_contains_chrecs (op1, NULL)) - return chrec_dont_know; + { + /* We can strip sign-conversions to signed by performing the + operation in unsigned. */ + tree optype = TREE_TYPE (TREE_OPERAND (op1, 0)); + if (INTEGRAL_TYPE_P (type) + && INTEGRAL_TYPE_P (optype) + && tree_nop_conversion_p (type, optype) + && TYPE_UNSIGNED (optype)) + return chrec_convert (type, + chrec_fold_plus_1 (code, optype, + chrec_convert (optype, + op0, NULL), + TREE_OPERAND (op1, 0)), + NULL); + if (tree_contains_chrecs (op1, NULL)) + return chrec_dont_know; + } /* FALLTHRU */ default: @@ -313,8 +328,23 @@ chrec_fold_plus_1 (enum tree_code code, tree type, } CASE_CONVERT: - if (tree_contains_chrecs (op0, NULL)) - return chrec_dont_know; + { + /* We can strip sign-conversions to signed by performing the + operation in unsigned. */ + tree optype = TREE_TYPE (TREE_OPERAND (op0, 0)); + if (INTEGRAL_TYPE_P (type) + && INTEGRAL_TYPE_P (optype) + && tree_nop_conversion_p (type, optype) + && TYPE_UNSIGNED (optype)) + return chrec_convert (type, + chrec_fold_plus_1 (code, optype, + TREE_OPERAND (op0, 0), + chrec_convert (optype, + op1, NULL)), + NULL); + if (tree_contains_chrecs (op0, NULL)) + return chrec_dont_know; + } /* FALLTHRU */ default: |