diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index ee7b3f9..212da33 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. */ |