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* regcprop.c (copyprop_hardreg_forward_1): Remove noop moves.

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From-SVN: r240365
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Jan Hubicka 2016-09-22 16:34:09 +02:00 committed by Jan Hubicka
parent 2dbe56bdfb
commit d6da226a1e
2 changed files with 27 additions and 1 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2016-09-22 Jan Hubicka <hubicka@ucw.cz>
* regcprop.c (copyprop_hardreg_forward_1): Remove noop moves.
2016-09-22 Trevor Saunders <tbsaunde+gcc@tbsaunde.org> 2016-09-22 Trevor Saunders <tbsaunde+gcc@tbsaunde.org>
* emit-rtl.c (next_cc0_user): Make argument type rtx_insn *. * emit-rtl.c (next_cc0_user): Make argument type rtx_insn *.

24
gcc/regcprop.c
View File

@ -771,6 +771,26 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd)
} }
set = single_set (insn); set = single_set (insn);
/* Detect noop sets and remove them before processing side effects. */
if (set && REG_P (SET_DEST (set)) && REG_P (SET_SRC (set)))
{
unsigned int regno = REGNO (SET_SRC (set));
rtx r1 = find_oldest_value_reg (REGNO_REG_CLASS (regno),
SET_DEST (set), vd);
rtx r2 = find_oldest_value_reg (REGNO_REG_CLASS (regno),
SET_SRC (set), vd);
if (rtx_equal_p (r1 ? r1 : SET_DEST (set), r2 ? r2 : SET_SRC (set)))
{
bool last = insn == BB_END (bb);
fprintf (stderr, "Bingo\n");
delete_insn (insn);
if (last)
break;
continue;
}
}
extract_constrain_insn (insn); extract_constrain_insn (insn);
preprocess_constraints (insn); preprocess_constraints (insn);
const operand_alternative *op_alt = which_op_alt (); const operand_alternative *op_alt = which_op_alt ();
@ -860,7 +880,9 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd)
register in the same class. */ register in the same class. */
if (REG_P (SET_DEST (set))) if (REG_P (SET_DEST (set)))
{ {
new_rtx = find_oldest_value_reg (REGNO_REG_CLASS (regno), src, vd); new_rtx = find_oldest_value_reg (REGNO_REG_CLASS (regno),
src, vd);
if (new_rtx && validate_change (insn, &SET_SRC (set), new_rtx, 0)) if (new_rtx && validate_change (insn, &SET_SRC (set), new_rtx, 0))
{ {
if (dump_file) if (dump_file)