diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 556228f77b8..5ec7ee3afce 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -2917,6 +2917,18 @@ try_combine (rtx i3, rtx i2, rtx i1, rtx i0, int *new_direct_jump_p) else added_sets_0 = 0; + /* We are about to copy insns for the case where they need to be kept + around. Check that they can be copied in the merged instruction. */ + + if (targetm.cannot_copy_insn_p + && ((added_sets_2 && targetm.cannot_copy_insn_p (i2)) + || (i1 && added_sets_1 && targetm.cannot_copy_insn_p (i1)) + || (i0 && added_sets_0 && targetm.cannot_copy_insn_p (i0)))) + { + undo_all (); + return 0; + } + /* If the set in I2 needs to be kept around, we must make a copy of PATTERN (I2), so that when we substitute I1SRC for I1DEST in PATTERN (I2), we are only substituting for the original I1DEST, not into |