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| author | Ian Lance Taylor <iant@golang.org> | 2021-09-17 08:46:39 -0700 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2021-09-17 08:46:39 -0700 |
| commit | a0791d0ed4f147ef347e83f4aedc7ad03f1a2008 (patch) | |
| tree | 7b3526910798e4cff7a7200d684383046bac6225 /gcc/combine.c | |
| parent | e252b51ccde010cbd2a146485d8045103cd99533 (diff) | |
| parent | 89be17a1b231ade643f28fbe616d53377e069da8 (diff) | |
| download | gcc-a0791d0ed4f147ef347e83f4aedc7ad03f1a2008.zip gcc-a0791d0ed4f147ef347e83f4aedc7ad03f1a2008.tar.gz gcc-a0791d0ed4f147ef347e83f4aedc7ad03f1a2008.tar.bz2 | |
Merge from trunk revision 89be17a1b231ade643f28fbe616d53377e069da8.
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 290a366..892c834 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -3063,6 +3063,16 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0, return 0; } + /* We cannot safely duplicate volatile references in any case. */ + + if ((added_sets_2 && volatile_refs_p (PATTERN (i2))) + || (added_sets_1 && volatile_refs_p (PATTERN (i1))) + || (added_sets_0 && volatile_refs_p (PATTERN (i0)))) + { + undo_all (); + return 0; + } + /* Count how many auto_inc expressions there were in the original insns; we need to have the same number in the resulting patterns. */ |