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author | Paolo Bonzini <bonzini@gnu.org> | 2006-01-16 18:20:32 +0000 |
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committer | Paolo Bonzini <bonzini@gcc.gnu.org> | 2006-01-16 18:20:32 +0000 |
commit | 0efa4029c4390bacd5ac9659cbb30238d0975880 (patch) | |
tree | 09fe661a6f25ff56550e333ac12b26e02d767733 /gcc/combine.c | |
parent | 61ead1351f094cfab41940ea093b88d1ec6dcde6 (diff) | |
download | gcc-0efa4029c4390bacd5ac9659cbb30238d0975880.zip gcc-0efa4029c4390bacd5ac9659cbb30238d0975880.tar.gz gcc-0efa4029c4390bacd5ac9659cbb30238d0975880.tar.bz2 |
combine.c (record_value_for_reg): Invalidate registers if INSN is null.
2005-01-16 Paolo Bonzini <bonzini@gnu.org>
* combine.c (record_value_for_reg): Invalidate registers
if INSN is null.
(record_dead_and_set_regs_1): Likewise, by passing them to
record_value_for_reg.
(record_dead_and_set_regs): Invalidate stores made by a
call. We do not combine across a call, but we still
relied on equivalences.
From-SVN: r109759
Diffstat (limited to 'gcc/combine.c')
-rw-r--r-- | gcc/combine.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 16bb99c..69b9c10 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -10927,7 +10927,7 @@ record_value_for_reg (rtx reg, rtx insn, rtx value) for (i = regno; i < endregno; i++) { reg_stat[i].last_set_label = label_tick; - if (value && reg_stat[i].last_set_table_tick == label_tick) + if (!insn || (value && reg_stat[i].last_set_table_tick == label_tick)) reg_stat[i].last_set_invalid = 1; else reg_stat[i].last_set_invalid = 0; @@ -10976,6 +10976,13 @@ record_dead_and_set_regs_1 (rtx dest, rtx setter, void *data) if (GET_CODE (dest) == SUBREG) dest = SUBREG_REG (dest); + if (!record_dead_insn) + { + if (REG_P (dest)) + record_value_for_reg (dest, NULL_RTX, NULL_RTX); + return; + } + if (REG_P (dest)) { /* If we are setting the whole register, we know its value. Otherwise @@ -11049,15 +11056,14 @@ record_dead_and_set_regs (rtx insn) last_call_cuid = mem_last_set = INSN_CUID (insn); - /* Don't bother recording what this insn does. It might set the - return value register, but we can't combine into a call - pattern anyway, so there's no point trying (and it may cause - a crash, if e.g. we wind up asking for last_set_value of a - SUBREG of the return value register). */ - return; + /* We can't combine into a call pattern. Remember, though, that + the return value register is set at this CUID. We could + still replace a register with the return value from the + wrong subroutine call! */ + note_stores (PATTERN (insn), record_dead_and_set_regs_1, NULL_RTX); } - - note_stores (PATTERN (insn), record_dead_and_set_regs_1, insn); + else + note_stores (PATTERN (insn), record_dead_and_set_regs_1, insn); } /* If a SUBREG has the promoted bit set, it is in fact a property of the |