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| author | Zdenek Dvorak <dvorakz@suse.cz> | 2007-06-07 17:34:40 +0200 |
|---|---|---|
| committer | Zdenek Dvorak <rakdver@gcc.gnu.org> | 2007-06-07 15:34:40 +0000 |
| commit | 1b0cfaa6a890d6cea3ce6a98a707219cac2aedd6 (patch) | |
| tree | 2586a430ab0f0ff3785d02bffe3655a97c934318 /gcc/tree-predcom.c | |
| parent | 554a540059995075ef1f631dbbfc7ef975ede43f (diff) | |
| download | gcc-1b0cfaa6a890d6cea3ce6a98a707219cac2aedd6.zip gcc-1b0cfaa6a890d6cea3ce6a98a707219cac2aedd6.tar.gz gcc-1b0cfaa6a890d6cea3ce6a98a707219cac2aedd6.tar.bz2 | |
re PR tree-optimization/32220 (internal compiler error: in eliminate_temp_copies, at tree-predcom.c:1937)
PR tree-optimization/32220
* tree-predcom.c (eliminate_temp_copies): Handle the case that loop
phi node is reached before defining statement.
* gfortran.dg/predcom-2.f: New testcase.
From-SVN: r125531
Diffstat (limited to 'gcc/tree-predcom.c')
| -rw-r--r-- | gcc/tree-predcom.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/tree-predcom.c b/gcc/tree-predcom.c index 5c90fb1..4e54713 100644 --- a/gcc/tree-predcom.c +++ b/gcc/tree-predcom.c @@ -1932,7 +1932,13 @@ eliminate_temp_copies (struct loop *loop, bitmap tmp_vars) /* Base all the ssa names in the ud and du chain of NAME on VAR. */ stmt = SSA_NAME_DEF_STMT (use); - while (TREE_CODE (stmt) == PHI_NODE) + while (TREE_CODE (stmt) == PHI_NODE + /* In case we could not unroll the loop enough to eliminate + all copies, we may reach the loop header before the defining + statement (in that case, some register copies will be present + in loop latch in the final code, corresponding to the newly + created looparound phi nodes). */ + && bb_for_stmt (stmt) != loop->header) { gcc_assert (single_pred_p (bb_for_stmt (stmt))); use = PHI_ARG_DEF (stmt, 0); |