diff options
| author | saaadhu <saaadhu@138bc75d-0d04-0410-961f-82ee72b054a4> | 2018-12-17 13:26:50 +0000 |
|---|---|---|
| committer | saaadhu <saaadhu@138bc75d-0d04-0410-961f-82ee72b054a4> | 2018-12-17 13:26:50 +0000 |
| commit | 1cd07e036808bd45812796cc6fd47f9b6764eaae (patch) | |
| tree | 2293c6087d82c0a19b0f37bdc7ee1c3b1a6308b6 /gcc/combine.c | |
| parent | c51441f7f92fe9f4a0a452c1f8d283751ad463c5 (diff) | |
2018-12-17 Senthil Kumar Selvaraj <senthilkumar.selvaraj@microchip.com>
Backport from trunk
2018-12-17 Senthil Kumar Selvaraj <senthilkumar.selvaraj@microchip.com>
PR rtl-optimization/88253
* combine.c (combine_simplify_rtx): Test for side-effects before
substituting by zero.
2018-12-17 Senthil Kumar Selvaraj <senthilkumar.selvaraj@microchip.com>
Backport from trunk
2018-12-17 Senthil Kumar Selvaraj <senthilkumar.selvaraj@microchip.com>
PR rtl-optimization/88253
* gcc.target/avr/pr88253.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-7-branch@267201 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index bc023d2f994..56f7f491234 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5807,8 +5807,9 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest, && GET_MODE_PRECISION (mode) < GET_MODE_PRECISION (op0_mode) && subreg_lowpart_offset (mode, op0_mode) == SUBREG_BYTE (x) && HWI_COMPUTABLE_MODE_P (op0_mode) - && (nonzero_bits (SUBREG_REG (x), op0_mode) - & GET_MODE_MASK (mode)) == 0) + && ((nonzero_bits (SUBREG_REG (x), op0_mode) + & GET_MODE_MASK (mode)) == 0) + && !side_effects_p (SUBREG_REG (x))) return CONST0_RTX (mode); } |