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PR target/105930: Split *xordi3_doubleword after reload on x86. 

This is a backport of the fix for PR target/105930 from mainline to the
gcc12 release branch.

2022-07-09  Roger Sayle  <roger@nextmovesoftware.com>
	    Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog
	PR target/105930
	* config/i386/i386.md (*<any_or>di3_doubleword): Split after
	reload.  Use rtx_equal_p to avoid creating memory-to-memory moves,
	and emit NOTE_INSN_DELETED if operand[2] is zero (i.e. with -O0).
This commit is contained in:
Roger Sayle 2022-07-09 12:38:12 +01:00
parent 3fbb94b3a4
commit 3ce205f62d
1 changed files with 14 additions and 8 deletions
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22
gcc/config/i386/i386.md
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@ -10400,22 +10400,25 @@
"ix86_expand_binary_operator (<CODE>, <MODE>mode, operands); DONE;")
(define_insn_and_split "*<code>di3_doubleword"
[(set (match_operand:DI 0 "nonimmediate_operand")
[(set (match_operand:DI 0 "nonimmediate_operand" "=ro,r")
(any_or:DI
(match_operand:DI 1 "nonimmediate_operand")
(match_operand:DI 2 "x86_64_szext_general_operand")))
(match_operand:DI 1 "nonimmediate_operand" "0,0")
(match_operand:DI 2 "x86_64_szext_general_operand" "re,o")))
(clobber (reg:CC FLAGS_REG))]
"!TARGET_64BIT
&& ix86_binary_operator_ok (<CODE>, DImode, operands)
&& ix86_pre_reload_split ()"
&& ix86_binary_operator_ok (<CODE>, DImode, operands)"
"#"
"&& 1"
"&& reload_completed"
[(const_int 0)]
{
/* This insn may disappear completely when operands[2] == const0_rtx
and operands[0] == operands[1], which requires a NOTE_INSN_DELETED. */
bool emit_insn_deleted_note_p = false;
split_double_mode (DImode, &operands[0], 3, &operands[0], &operands[3]);
if (operands[2] == const0_rtx)
emit_move_insn (operands[0], operands[1]);
emit_insn_deleted_note_p = true;
else if (operands[2] == constm1_rtx)
{
if (<CODE> == IOR)
@ -10427,7 +10430,10 @@
ix86_expand_binary_operator (<CODE>, SImode, &operands[0]);
if (operands[5] == const0_rtx)
emit_move_insn (operands[3], operands[4]);
{
if (emit_insn_deleted_note_p)
emit_note (NOTE_INSN_DELETED);
}
else if (operands[5] == constm1_rtx)
{
if (<CODE> == IOR)