This code used to handle register replacement issues with SUBREG before
simplify_replace_rtx was introduced. This should not be needed anymore as
new_val has the correct mode and that should be preserved by
simplify_replace_rtx.
gcc/ChangeLog:
* ifcvt.cc (noce_convert_multiple_sets_1): Remove old code.
Signed-off-by: Manolis Tsamis <manolis.tsa...@vrull.eu>
---
(no changes since v1)
gcc/ifcvt.cc | 38 --------------------------------------
1 file changed, 38 deletions(-)
diff --git a/gcc/ifcvt.cc b/gcc/ifcvt.cc
index ecc0cbabef9..3b4b873612c 100644
--- a/gcc/ifcvt.cc
+++ b/gcc/ifcvt.cc
@@ -3449,44 +3449,6 @@ noce_convert_multiple_sets_1 (struct noce_if_info
*if_info,
if (if_info->then_else_reversed)
std::swap (old_val, new_val);
-
- /* We allow simple lowpart register subreg SET sources in
- bb_ok_for_noce_convert_multiple_sets. Be careful when processing
- sequences like:
- (set (reg:SI r1) (reg:SI r2))
- (set (reg:HI r3) (subreg:HI (r1)))
- For the second insn new_val or old_val (r1 in this example) will be
- taken from the temporaries and have the wider mode which will not
- match with the mode of the other source of the conditional move, so
- we'll end up trying to emit r4:HI = cond ? (r1:SI) : (r3:HI).
- Wrap the two cmove operands into subregs if appropriate to prevent
- that. */
-
- if (!CONSTANT_P (new_val)
- && GET_MODE (new_val) != GET_MODE (temp))
- {
- machine_mode src_mode = GET_MODE (new_val);
- machine_mode dst_mode = GET_MODE (temp);
- if (!partial_subreg_p (dst_mode, src_mode))
- {
- end_sequence ();
- return false;
- }
- new_val = lowpart_subreg (dst_mode, new_val, src_mode);
- }
- if (!CONSTANT_P (old_val)
- && GET_MODE (old_val) != GET_MODE (temp))
- {
- machine_mode src_mode = GET_MODE (old_val);
- machine_mode dst_mode = GET_MODE (temp);
- if (!partial_subreg_p (dst_mode, src_mode))
- {
- end_sequence ();
- return false;
- }
- old_val = lowpart_subreg (dst_mode, old_val, src_mode);
- }
-
/* We have identified swap-style idioms before. A normal
set will need to be a cmov while the first instruction of a swap-style
idiom can be a regular move. This helps with costing. */
--
2.34.1
