During machine reorg we optimize backward jumps and transform insns as
e.g.
(jump_insn 118 117 119 (set (pc)
(if_then_else (ne (reg:CCRAW 33 %cc)
(const_int 8 [0x8]))
(label_ref 134)
(pc))) "dec_math_1.f90":204:8 discrim 1 2161 {*cjump_64}
(expr_list:REG_DEAD (reg:CCRAW 33 %cc)
(int_list:REG_BR_PROB 719407028 (nil)))
-> 134)
into
(jump_insn 118 117 432 (set (pc)
(if_then_else (ne (reg:CCRAW 33 %cc)
(const_int 8 [0x8]))
(pc)
(label_ref 433))) "dec_math_1.f90":204:8 discrim 1 -1
(expr_list:REG_DEAD (reg:CCRAW 33 %cc)
(int_list:REG_BR_PROB 719407028 (nil)))
-> 433)
The latter is not recognized anymore since *icjump_64 only matches
CC_REGNUM against zero. Fixed by aligning *cjump_64 and *icjump_64.
gcc/ChangeLog:
* config/s390/s390.md (*icjump_64): Allow raw CC comparisons,
i.e., any constant integer between 0 and 15 for CC comparisons.
---
Bootstrap and regtest or still running. Assuming no regressions, ok
for {mainline,11,12,13,14}? Would be great to see this in 14.2 RC :)
gcc/config/s390/s390.md | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/config/s390/s390.md b/gcc/config/s390/s390.md
index f5d7003dfad..d3931b09417 100644
--- a/gcc/config/s390/s390.md
+++ b/gcc/config/s390/s390.md
@@ -9556,7 +9556,8 @@
(define_insn "*icjump_64"
[(set (pc)
(if_then_else
- (match_operator 1 "s390_comparison" [(reg CC_REGNUM) (const_int 0)])
+ (match_operator 1 "s390_comparison" [(reg CC_REGNUM)
+ (match_operand 2
"const_int_operand" "")])
(pc)
(label_ref (match_operand 0 "" ""))))]
""
--
2.45.2
