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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2015-01-22 01:35:44 +0100 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2015-01-22 01:35:44 +0100 |
| commit | c8b90a13c729f6fb33a97c4f4cd8116e5ef7fdf1 (patch) | |
| tree | c47c1b96b38857c0eb607f3b89455c8b7cd40939 /gcc/combine.c | |
| parent | a393438f272e85f4ec2b69dce9e82448312d4bce (diff) | |
| download | gcc-c8b90a13c729f6fb33a97c4f4cd8116e5ef7fdf1.zip gcc-c8b90a13c729f6fb33a97c4f4cd8116e5ef7fdf1.tar.gz gcc-c8b90a13c729f6fb33a97c4f4cd8116e5ef7fdf1.tar.bz2 | |
re PR rtl-optimization/64682 (wrong code at -O2 and -O3 on x86_64-linux-gnu)
PR rtl-optimization/64682
* combine.c (distribute_notes): When moving a death note for
a register that is set in the new I2, make sure to put it
before that new I2.
PR rtl-optimization/64682
* gcc.c-torture/execute/pr64682.c: New file.
From-SVN: r219981
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 597aa80..5c763b4 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -13684,6 +13684,11 @@ distribute_notes (rtx notes, rtx_insn *from_insn, rtx_insn *i3, rtx_insn *i2, || rtx_equal_p (XEXP (note, 0), elim_i0)) break; tem_insn = i3; + /* If the new I2 sets the same register that is marked dead + in the note, the note now should not be put on I2, as the + note refers to a previous incarnation of the reg. */ + if (i2 != 0 && reg_set_p (XEXP (note, 0), PATTERN (i2))) + tem_insn = i2; } if (place == 0) |