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| author | Kazu Hirata <kazu@cs.umass.edu> | 2005-04-17 17:57:10 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2005-04-17 17:57:10 +0000 |
| commit | 838bdb354907cc5bc648ebc97a658dc4288cbea3 (patch) | |
| tree | 6780e4789ad5be47442116df69fb1ac9b3a2fbae /gcc/tree-vrp.c | |
| parent | 30abf79348ff8927f4069bf8c48693afd658556f (diff) | |
| download | gcc-838bdb354907cc5bc648ebc97a658dc4288cbea3.zip gcc-838bdb354907cc5bc648ebc97a658dc4288cbea3.tar.gz gcc-838bdb354907cc5bc648ebc97a658dc4288cbea3.tar.bz2 | |
tree-vrp.c (maybe_add_assert_expr): Don't assert ASSERT_EXPRs for single-use variable.
* tree-vrp.c (maybe_add_assert_expr): Don't assert
ASSERT_EXPRs for single-use variable.
From-SVN: r98278
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 3bb4a6b..bb68df6 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -1446,6 +1446,14 @@ maybe_add_assert_expr (basic_block bb) { tree cond; + /* If OP is used only once, namely in this STMT, don't + bother inserting an ASSERT_EXPR for it. Such an + ASSERT_EXPR would do nothing but increase compile time. + Experiments show that with this simple check, we can save + more than 20% of ASSERT_EXPRs. */ + if (has_single_use (op)) + continue; + SET_BIT (found, SSA_NAME_VERSION (op)); cond = infer_value_range (stmt, op); |