https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105627
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2022-05-18
Status|UNCONFIRMED |NEW
CC| |jakub at gcc dot gnu.org,
| |linkw at gcc dot gnu.org,
| |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This diverges in the swaps rs6000-specific pass.
With:
-Og -fcompare-debug pr105627.c -fdump-tree-all -da --param
min-nondebug-insn-uid=10000
one can see:
@@ -173,17 +173,17 @@ Relevant insns with their flag settings
10359 10355 store swappable special:store
10360 10356 store swappable special:store
10361 10357 store swappable special:store
- 10363 0 load swap
+ 10363 10371 load swap
10364 10363 swap
10365 10363 swappable
10366 10363 swap
10367 10363 store swap
- 10371 0 load swap
+ 10371 10379 load swap
10372 10371 swap
10373 10371 swappable
10374 10371 swap
10375 10371 store swap
- 10379 0 load swap
+ 10379 10387 load swap
10380 10379 swap
10381 10379 swappable
10382 10379 swap
...
@@ -456,18 +456,6 @@ deferring rescan insn with uid = 10415.
Replacing store 10415 with permuted store
deferring rescan insn with uid = 10416.
Replacing store 10416 with permuted store
-deferring rescan insn with uid = 10432.
-deferring rescan insn with uid = 10432.
-Replacing swap 10018 with copy 10432
-deferring deletion of insn with uid = 10018.
-deferring rescan insn with uid = 10433.
-deferring rescan insn with uid = 10433.
-Replacing swap 10364 with copy 10433
-deferring deletion of insn with uid = 10364.
-deferring rescan insn with uid = 10434.
-deferring rescan insn with uid = 10434.
-Replacing swap 10366 with copy 10434
-deferring deletion of insn with uid = 10366.
starting the processing of deferred insns
verify found no changes in insn with uid = 10354.
verify found no changes in insn with uid = 10355.
etc. changes. DEBUG_INSNs shouldn't influence optimization decisions, but of
course might need to be adjusted or reset in some cases.
