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| author | segher <segher@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-12-19 19:55:32 +0000 |
|---|---|---|
| committer | segher <segher@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-12-19 19:55:32 +0000 |
| commit | 99f34dd57e154e1cf3d3858219cbf16cae9db537 (patch) | |
| tree | be4cb40019eebce167073443dc4dd6793e7e4554 | |
| parent | 7ecafe6b63061bd8d3377f3960b50681feb60be2 (diff) | |
| download | gcc-99f34dd57e154e1cf3d3858219cbf16cae9db537.tar.gz | |
PR target/64268
* combine.c (try_combine): Immediately return if any of I0,I1,I2
are the same insn.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218971 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/combine.c | 5 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e5733ae9c88..a800fed4a18 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2014-12-19 Segher Boessenkool <segher@kernel.crashing.org> + + PR target/64268 + * combine.c (try_combine): Immediately return if any of I0,I1,I2 + are the same insn. + 2014-12-19 Alan Lawrence <alan.lawrence@arm.com> * config/aarch64/aarch64.c (<LOGICAL:optab>_one_cmpl<mode>3): diff --git a/gcc/combine.c b/gcc/combine.c index ee7b3f9ec5f..212da3320f3 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -2588,6 +2588,11 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0, rtx new_other_notes; int i; + /* Immediately return if any of I0,I1,I2 are the same insn (I3 can + never be). */ + if (i1 == i2 || i0 == i2 || (i0 && i0 == i1)) + return 0; + /* Only try four-insn combinations when there's high likelihood of success. Look for simple insns, such as loads of constants or binary operations involving a constant. */ |