diff options
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/pr66894.c | 21 | ||||
| -rw-r--r-- | gcc/tree-vrp.c | 6 |
4 files changed, 34 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e945a28..1d5434c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2015-07-16 Richard Biener <rguenther@suse.de> + + PR tree-optimization/66894 + * tree-vrp.c (register_edge_assert_for_2): Fix bad assumption + about deriving NE_EXPR from truncated values. + 2015-07-16 Martin Liska <mliska@suse.cz> * alloc-pool.h diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 8bc9341..9bace80 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,5 +1,10 @@ 2015-07-16 Richard Biener <rguenther@suse.de> + PR tree-optimization/66894 + * gcc.dg/torture/pr66894.c: New testcase. + +2015-07-16 Richard Biener <rguenther@suse.de> + * gcc.dg/tree-ssa/pr21031.c: Adjust. 2015-07-16 Uros Bizjak <ubizjak@gmail.com> diff --git a/gcc/testsuite/gcc.dg/torture/pr66894.c b/gcc/testsuite/gcc.dg/torture/pr66894.c new file mode 100644 index 0000000..b544940 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr66894.c @@ -0,0 +1,21 @@ +/* { dg-do run } */ + +short a, b; + +int +main () +{ + for (; a != 1; a += 3) + { + int c = 0; + for (; c < 2; c++) + if (a) + { + char d = a; + b = d ? 1 / d : 0; + } + else + break; + } + return 0; +} diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 795b027..d962683 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -5382,13 +5382,11 @@ register_edge_assert_for_2 (tree name, edge e, gimple_stmt_iterator bsi, } else if (CONVERT_EXPR_CODE_P (code)) { - /* For truncating conversions require that the constant - fits in the truncated type if we are going to record + /* For truncating conversions we cannot record an inequality. */ if (comp_code == NE_EXPR && (TYPE_PRECISION (TREE_TYPE (name2)) - < TYPE_PRECISION (TREE_TYPE (name))) - && ! int_fits_type_p (val, TREE_TYPE (name2))) + < TYPE_PRECISION (TREE_TYPE (name)))) continue; cst = fold_convert (TREE_TYPE (name2), val); } |