[gcc r12-2173] Further improvements to H8 variable shift patterns

[gcc r12-2173] Further improvements to H8 variable shift patterns

[Jeff Law]

https://gcc.gnu.org/g:b14ac7b29c9a05c94f62fe065c219bbaa83653db

commit r12-2173-gb14ac7b29c9a05c94f62fe065c219bbaa83653db
Author: Jeff Law <jeffreyalaw@gmail.com>
Date:   Thu Jul 8 17:09:36 2021 -0400

    Further improvements to H8 variable shift patterns
    
    gcc/
    
            * config/h8300/shiftrotate.md (variable shifts): Expose condition
            code handling for the test before the loop.

Diff:
---
 gcc/config/h8300/shiftrotate.md | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/gcc/config/h8300/shiftrotate.md b/gcc/config/h8300/shiftrotate.md
index 485303cb906..d3aa6bea064 100644
--- a/gcc/config/h8300/shiftrotate.md
+++ b/gcc/config/h8300/shiftrotate.md
@@ -377,8 +377,10 @@
    (clobber (reg:CC CC_REG))]
   "epilogue_completed
    && find_regno_note (insn, REG_DEAD, REGNO (operands[1]))"
-  [(set (pc)
-        (if_then_else (le (match_dup 1) (const_int 0))
+  [(set (reg:CCZN CC_REG)
+        (compare:CCZN (match_dup 1) (const_int 0)))
+   (set (pc)
+        (if_then_else (le (reg:CCZN CC_REG)  (const_int 0))
 		      (label_ref (match_dup 5))
 		      (pc)))
    (match_dup 4)
@@ -411,10 +413,12 @@
    (clobber (reg:CC CC_REG))]
   "epilogue_completed
    && !find_regno_note (insn, REG_DEAD, REGNO (operands[1]))"
-  [(set (match_dup 3)
-	(match_dup 1))
+  [(parallel
+     [(set (reg:CCZN CC_REG)
+	   (compare:CCZN (match_dup 1) (const_int 0)))
+      (set (match_dup 3) (match_dup 1))])
    (set (pc)
-        (if_then_else (le (match_dup 3) (const_int 0))
+        (if_then_else (le (reg:CCZN CC_REG) (const_int 0))
 		      (label_ref (match_dup 5))
 		      (pc)))
    (match_dup 4)