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From: Jeff Law <law@gcc.gnu.org>
To: gcc-cvs@gcc.gnu.org
Subject: [gcc r12-2042] Remove redundant compare in shift loop on H8
Date: Mon, 5 Jul 2021 21:25:49 +0000 (GMT) [thread overview]
Message-ID: <20210705212549.160C33850409@sourceware.org> (raw)
https://gcc.gnu.org/g:1562c7987be115311a75b1074c3768a1b006adb6
commit r12-2042-g1562c7987be115311a75b1074c3768a1b006adb6
Author: Jeff Law <jeffreyalaw@gmail.com>
Date: Mon Jul 5 17:23:43 2021 -0400
Remove redundant compare in shift loop on H8
gcc/ChangeLog
* config/h8300/shiftrotate.md (shift-by-variable patterns): Update to
generate condition code aware RTL directly.
Diff:
---
gcc/config/h8300/shiftrotate.md | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/gcc/config/h8300/shiftrotate.md b/gcc/config/h8300/shiftrotate.md
index 0476324bf22..485303cb906 100644
--- a/gcc/config/h8300/shiftrotate.md
+++ b/gcc/config/h8300/shiftrotate.md
@@ -385,10 +385,15 @@
(parallel
[(set (match_dup 0)
(match_op_dup 2 [(match_dup 0) (const_int 1)]))
- (clobber (scratch:QI))])
- (set (match_dup 1) (plus:QI (match_dup 1) (const_int -1)))
+ (clobber (reg:CC CC_REG))])
+ (parallel
+ [(set (reg:CCZN CC_REG)
+ (compare:CCZN
+ (plus:QI (match_dup 1) (const_int -1))
+ (const_int 0)))
+ (set (match_dup 1) (plus:QI (match_dup 1) (const_int -1)))])
(set (pc)
- (if_then_else (ne (match_dup 1) (const_int 0))
+ (if_then_else (ne (reg:CCZN CC_REG) (const_int 0))
(label_ref (match_dup 4))
(pc)))
(match_dup 5)]
@@ -416,10 +421,15 @@
(parallel
[(set (match_dup 0)
(match_op_dup 2 [(match_dup 0) (const_int 1)]))
- (clobber (scratch:QI))])
- (set (match_dup 3) (plus:QI (match_dup 3) (const_int -1)))
+ (clobber (reg:CC CC_REG))])
+ (parallel
+ [(set (reg:CCZN CC_REG)
+ (compare:CCZN
+ (plus:QI (match_dup 3) (const_int -1))
+ (const_int 0)))
+ (set (match_dup 3) (plus:QI (match_dup 3) (const_int -1)))])
(set (pc)
- (if_then_else (ne (match_dup 3) (const_int 0))
+ (if_then_else (ne (reg:CCZN CC_REG) (const_int 0))
(label_ref (match_dup 4))
(pc)))
(match_dup 5)]
reply other threads:[~2021-07-05 21:25 UTC|newest]
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