diff options
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/predict.c | 14 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr46288.c | 8 |
4 files changed, 30 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 73198e3..e62aaab 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2010-11-03 Richard Guenther <rguenther@suse.de> + + PR middle-end/46288 + * predict.c (strip_predict_hints): Simply DCE builtin expect if + the result is unused. + 2010-11-03 Jakub Jelinek <jakub@redhat.com> PR tree-optimization/46009 diff --git a/gcc/predict.c b/gcc/predict.c index eb91b87..beceb0f2 100644 --- a/gcc/predict.c +++ b/gcc/predict.c @@ -1329,9 +1329,17 @@ strip_predict_hints (void) && gimple_call_num_args (stmt) == 2) { var = gimple_call_lhs (stmt); - ass_stmt = gimple_build_assign (var, gimple_call_arg (stmt, 0)); - - gsi_replace (&bi, ass_stmt, true); + if (var) + { + ass_stmt + = gimple_build_assign (var, gimple_call_arg (stmt, 0)); + gsi_replace (&bi, ass_stmt, true); + } + else + { + gsi_remove (&bi, true); + continue; + } } } gsi_next (&bi); diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 5e266c1..61c24f9 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,5 +1,10 @@ 2010-11-03 Richard Guenther <rguenther@suse.de> + PR middle-end/46288 + * gcc.dg/pr46288.c: New testcase. + +2010-11-03 Richard Guenther <rguenther@suse.de> + PR tree-optimization/44807 * gcc.dg/torture/pr44807.c: New testcase. diff --git a/gcc/testsuite/gcc.dg/pr46288.c b/gcc/testsuite/gcc.dg/pr46288.c new file mode 100644 index 0000000..24c8874 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr46288.c @@ -0,0 +1,8 @@ +/* { dg-do compile } */ +/* { dg-options "-O -fno-tree-dce" } */ + +void foo (int i) +{ + __builtin_expect (i, i); +} + |