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| author | Richard Biener <rguenther@suse.de> | 2015-10-21 07:56:54 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2015-10-21 07:56:54 +0000 |
| commit | 33b35c280747d60086dc2cc640a3c15239ec3e8d (patch) | |
| tree | 28cdc95e77a1644adafeaae0856a3b901aa4e0cf /gcc | |
| parent | 7047bc9c1613aa243357d6db7d66683e3e9e0e4d (diff) | |
| download | gcc-33b35c280747d60086dc2cc640a3c15239ec3e8d.zip gcc-33b35c280747d60086dc2cc640a3c15239ec3e8d.tar.gz gcc-33b35c280747d60086dc2cc640a3c15239ec3e8d.tar.bz2 | |
re PR tree-optimization/68026 (Regression in GCC-6.0.0's optimizer)
2015-10-21 Richard Biener <rguenther@suse.de>
PR tree-optimization/68026
* tree-ssa-ccp.c (get_value_for_expr): Zero-extend mask for
unsigned VARYING values.
* gcc.dg/tree-ssa/ssa-ccp-39.c: New testcase.
From-SVN: r229117
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-39.c | 19 | ||||
| -rw-r--r-- | gcc/tree-ssa-ccp.c | 5 |
4 files changed, 35 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2b15977..20c272d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2015-10-21 Richard Biener <rguenther@suse.de> + + PR tree-optimization/68026 + * tree-ssa-ccp.c (get_value_for_expr): Zero-extend mask for + unsigned VARYING values. + 2015-10-21 Maxim Ostapenko <m.ostapenko@partner.samsung.com> * asan.c (asan_emit_stack_protection): Don't pass local stack to diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index df80435..1809ddf 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2015-10-21 Richard Biener <rguenther@suse.de> + + PR tree-optimization/68026 + * gcc.dg/tree-ssa/ssa-ccp-39.c: New testcase. + 2015-10-21 Maxim Ostapenko <m.ostapenko@partner.samsung.com> * c-c++-common/ubsan/float-cast-overflow-10.c: Adjust test. diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-39.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-39.c new file mode 100644 index 0000000..21af559 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-39.c @@ -0,0 +1,19 @@ +/* { dg-do run } */ +/* { dg-options "-O -fdump-tree-ccp1" } */ + +int main (void) +{ + volatile int x1 = 1; + volatile int x2 = 1; + int x3 = 2; + int t = 1; + + t = 3<=(x2|1|x3|x1-1U); + + if (t == 1) {} + else { __builtin_abort(); } + + return 0; +} + +/* { dg-final { scan-tree-dump-not "abort" "ccp1" } } */ diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c index ed5fe1e..2c69178 100644 --- a/gcc/tree-ssa-ccp.c +++ b/gcc/tree-ssa-ccp.c @@ -629,6 +629,11 @@ get_value_for_expr (tree expr, bool for_bits_p) val.mask = -1; val.value = NULL_TREE; } + + if (val.lattice_val == VARYING + && TYPE_UNSIGNED (TREE_TYPE (expr))) + val.mask = wi::zext (val.mask, TYPE_PRECISION (TREE_TYPE (expr))); + return val; } |