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| author | Richard Biener <rguenther@suse.de> | 2024-05-07 10:14:19 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2024-05-07 10:15:20 +0200 |
| commit | 9dbff9c05520a74e6cd337578f27b56c941f64f3 (patch) | |
| tree | 91760840adbc10b5d0ddfe75c1b02d54e3f204cb | |
| parent | cb478e0a6f3a296e1c234a85fc0d45d633a0ff93 (diff) | |
| download | gcc-9dbff9c05520a74e6cd337578f27b56c941f64f3.zip gcc-9dbff9c05520a74e6cd337578f27b56c941f64f3.tar.gz gcc-9dbff9c05520a74e6cd337578f27b56c941f64f3.tar.bz2 | |
Revert "Revert "combine: Don't combine if I2 does not change""
This reverts commit 109f1b28fc94c93096506e3df0c25e331cef19d0.
| -rw-r--r-- | gcc/combine.cc | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/combine.cc b/gcc/combine.cc index 92b8d98..71c9abc 100644 --- a/gcc/combine.cc +++ b/gcc/combine.cc @@ -4196,6 +4196,17 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0, adjust_for_new_dest (i3); } + /* If I2 didn't change, this is not a combination (but a simplification or + canonicalisation with context), which should not be done here. Doing + it here explodes the algorithm. Don't. */ + if (rtx_equal_p (newi2pat, PATTERN (i2))) + { + if (dump_file) + fprintf (dump_file, "i2 didn't change, not doing this\n"); + undo_all (); + return 0; + } + /* We now know that we can do this combination. Merge the insns and update the status of registers and LOG_LINKS. */ |