diff options
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. */ |