https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93402
--- Comment #9 from CVS Commits ---
The releases/gcc-8 branch has been updated by Jakub Jelinek
:
https://gcc.gnu.org/g:83799a013b4a7f555b1a168fcb5f8df25edede99
commit r8-10011-g83799a013b4a7f555b1a168fcb5f8df25edede99
Author: Jakub Jelinek
Date: Fri Feb 14 15:44:23 2020 +0100
postreload: Fix up postreload combine [PR93402]
The following testcase is miscompiled, because the postreload pass changes:
-(insn 14 13 23 2 (parallel [
-(set (reg:DI 1 dx [94])
-(plus:DI (reg:DI 1 dx [95])
-(reg:DI 5 di [92])))
-(clobber (reg:CC 17 flags))
-]) "pr93402.c":8:30 186 {*adddi_1}
- (expr_list:REG_EQUAL (plus:DI (reg:DI 5 di [92])
-(const_int [0x19debd01c7]))
-(nil)))
-(insn 23 14 25 2 (set (reg:SI 0 ax)
+(insn 23 13 25 2 (set (reg:SI 0 ax)
(const_int 0 [0])) "pr93402.c":10:1 67 {*movsi_internal}
(nil))
(insn 25 23 26 2 (use (reg:SI 0 ax)) "pr93402.c":10:1 -1
(nil))
-(insn 26 25 35 2 (use (reg:DI 1 dx)) "pr93402.c":10:1 -1
+(insn 26 25 35 2 (use (plus:DI (reg:DI 1 dx [95])
+(reg:DI 5 di [92]))) "pr93402.c":10:1 -1
(nil))
A USE insn is not a normal insn and verify_changes called from
apply_change_group is happy about any changes into it.
The following patch avoids this optimization if we were to change
the USE operand (this routine only changes a reg into (plus reg reg2)).
2020-01-23 Jakub Jelinek
PR rtl-optimization/93402
* postreload.c (reload_combine_recognize_pattern): Don't try to adjust
USE insns.
* gcc.c-torture/execute/pr93402.c: New test.
