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| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-12-18 17:17:14 +0000 |
|---|---|---|
| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-12-18 17:17:14 +0000 |
| commit | 40c562ee23d8f14dbb39ea5beb6a39ff8e99c370 (patch) | |
| tree | 1f9cb33de6c2b56bbe4cfc7761ac15dc58e0038a /gcc/cse.c | |
| parent | f69e6a990b5fa6d2f01c82fd210b8cd538def834 (diff) | |
| download | gcc-40c562ee23d8f14dbb39ea5beb6a39ff8e99c370.tar.gz | |
[PATCH] [PR rtl-optimization/49847] Fix ICE in CSE due to cc0-setter and cc0-user in different blocks
PR rtl-optimization/49847
* cse.c (record_jump_equiv): Handle fold_rtx returning NULL_RTX.
PR rtl-optimization/49847
* g++.dg/pr49847-2.C: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@231821 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index cb78a95c0b8..4232028f54f 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -3874,6 +3874,13 @@ record_jump_equiv (rtx_insn *insn, bool taken) op0 = fold_rtx (XEXP (XEXP (SET_SRC (set), 0), 0), insn); op1 = fold_rtx (XEXP (XEXP (SET_SRC (set), 0), 1), insn); + /* On a cc0 target the cc0-setter and cc0-user may end up in different + blocks. When that happens the tracking of the cc0-setter via + PREV_INSN_CC0 is spoiled. That means that fold_rtx may return + NULL_RTX. In those cases, there's nothing to record. */ + if (op0 == NULL_RTX || op1 == NULL_RTX) + return; + code = find_comparison_args (code, &op0, &op1, &mode0, &mode1); if (! cond_known_true) { |