diff options
| author | Jeff Law <law@redhat.com> | 2019-02-26 10:08:06 -0700 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2019-02-26 10:08:06 -0700 |
| commit | f73675e3c7503d6d48ea5ac29cd9b5e9d007668f (patch) | |
| tree | 27dca3a9798238978aeb505c5e6945a926edb54e /gcc | |
| parent | 067aef033f3a9ad971fc75ce0631c500de0f0423 (diff) | |
| download | gcc-f73675e3c7503d6d48ea5ac29cd9b5e9d007668f.zip gcc-f73675e3c7503d6d48ea5ac29cd9b5e9d007668f.tar.gz gcc-f73675e3c7503d6d48ea5ac29cd9b5e9d007668f.tar.bz2 | |
re PR rtl-optimization/87761 ([MIPS] New FAIL: gcc.target/mips/fix-r4000-10.c -O1 start with r265398)
PR rtl-optimization/87761
* regcprop.c (copyprop_hardreg_forward_1): Use REG_UNUSED notes to
detect obviously dead insns and delete them.
From-SVN: r269218
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/regcprop.c | 16 |
2 files changed, 22 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c4260af..92a90bc 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2019-02-26 Jeff Law <law@redhat.com> + + PR rtl-optimization/87761 + * regcprop.c (copyprop_hardreg_forward_1): Use REG_UNUSED notes to + detect obviously dead insns and delete them. + 2019-02-26 Richard Biener <rguenther@suse.de> PR tree-optimization/89505 diff --git a/gcc/regcprop.c b/gcc/regcprop.c index e6bdeb0..926df40 100644 --- a/gcc/regcprop.c +++ b/gcc/regcprop.c @@ -798,6 +798,22 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd) } } + /* Detect obviously dead sets (via REG_UNUSED notes) and remove them. */ + if (set + && INSN_P (insn) + && !may_trap_p (insn) + && find_reg_note (insn, REG_UNUSED, SET_DEST (set)) + && !side_effects_p (SET_SRC (set)) + && !side_effects_p (SET_DEST (set))) + { + bool last = insn == BB_END (bb); + delete_insn (insn); + if (last) + break; + continue; + } + + extract_constrain_insn (insn); preprocess_constraints (insn); const operand_alternative *op_alt = which_op_alt (); |