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| author | Kazu Hirata <kazu@cs.umass.edu> | 2005-04-14 13:34:57 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2005-04-14 13:34:57 +0000 |
| commit | a0ce797889cd14d04b87cdacb089fcee6f73415e (patch) | |
| tree | 970b0e0064b90ed58896a85a06254562b80eb47c /gcc | |
| parent | c44001c64356db774cbdc4c47d6ce7120b683f6c (diff) | |
| download | gcc-a0ce797889cd14d04b87cdacb089fcee6f73415e.zip gcc-a0ce797889cd14d04b87cdacb089fcee6f73415e.tar.gz gcc-a0ce797889cd14d04b87cdacb089fcee6f73415e.tar.bz2 | |
re PR tree-optimization/20657 ([tcb] VRP does not get rid of a redundant "if" statement.)
gcc/
PR tree-optimization/20657
* tree-vrp.c (extract_range_from_expr): Notice INTEGER_CST to
create an appropriate range from it.
testsuite/
PR tree-optimization/20657
* gcc.dg/tree-ssa/pr20657.c: New.
From-SVN: r98134
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/pr20657.c | 17 | ||||
| -rw-r--r-- | gcc/tree-vrp.c | 2 |
4 files changed, 30 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5dc6889..3a5d50a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2005-04-14 Kazu Hirata <kazu@cs.umass.edu> + + PR tree-optimization/20657 + * tree-vrp.c (extract_range_from_expr): Notice INTEGER_CST to + create an appropriate range from it. + 2005-04-14 Uros Bizjak <uros@kss-loka.si> * reg-stack.c (subst_stack_regs_pat): Handle <UNSPEC_FIST_FLOOR> and diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d773106..83d08f5 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2005-04-14 Kazu Hirata <kazu@cs.umass.edu> + + PR tree-optimization/20657 + * gcc.dg/tree-ssa/pr20657.c: New. + 2005-04-14 Uros Bizjak <uros@kss-loka.si> * gcc.dg/builtins-53.c: Also check (int)trunc* and diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr20657.c b/gcc/testsuite/gcc.dg/tree-ssa/pr20657.c new file mode 100644 index 0000000..ac89847 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr20657.c @@ -0,0 +1,17 @@ +/* PR tree-optimization/20657 + VRP did not pick up a conditional equivalence from the first "if" + statement, which was needed to eliminate the second "if" statement. */ + +/* { dg-do compile } */ +/* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-vrp-details" } */ + +int +foo (int a) +{ + if (a == 0) + if (a == 0) + return 1; + return 0; +} + +/* { dg-final { scan-tree-dump-times "Folding predicate" 1 "vrp"} } */ diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index e8f52bb..014f195 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -830,6 +830,8 @@ extract_range_from_expr (value_range *vr, tree expr) extract_range_from_unary_expr (vr, expr); else if (expr_computes_nonzero (expr)) set_value_range_to_nonnull (vr, TREE_TYPE (expr)); + else if (TREE_CODE (expr) == INTEGER_CST) + set_value_range (vr, VR_RANGE, expr, expr); else set_value_range (vr, VR_VARYING, NULL_TREE, NULL_TREE); } |