https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #16 from iii at gcc dot gnu.org ---
Author: iii
Date: Mon Dec 3 09:49:02 2018
New Revision: 266734
URL: https://gcc.gnu.org/viewcvs?rev=266734&root=gcc&view=rev
Log:
Repeat jump threading after combine
Consider the following RTL:
(
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #15 from iii at gcc dot gnu.org ---
Author: iii
Date: Mon Sep 24 14:21:03 2018
New Revision: 264535
URL: https://gcc.gnu.org/viewcvs?rev=264535&root=gcc&view=rev
Log:
S/390: Fix conditional returns on z196+
S/390 epilogue ends with (
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #14 from Andreas Krebbel ---
Author: krebbel
Date: Thu Sep 6 07:38:42 2018
New Revision: 264143
URL: https://gcc.gnu.org/viewcvs?rev=264143&root=gcc&view=rev
Log:
S/390: Prohibit SYMBOL_REF in UNSPECV_CAS
Inhibit constant propagati
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #13 from Andreas Krebbel ---
Author: krebbel
Date: Thu Sep 6 07:35:35 2018
New Revision: 264142
URL: https://gcc.gnu.org/viewcvs?rev=264142&root=gcc&view=rev
Log:
S/390: Register pass_s390_early_mach statically
The dump file used t
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #12 from Ilya Leoshkevich ---
I've investigated foo3, foo4 and foo5, and came to the following
conclusions:
When foo3 is compiled with -march=z10 or later, cprop1 pass propagates
global's SYMBOL_REF value into UNSPECV_CAS. On previo
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #11 from stli at linux dot ibm.com ---
Hi,
I've retested the samples with gcc 7, 8 and head from 2018-07-20, but there are
still issues:
The examples foo1 and foo2 are okay.
The issue in example foo3 is still present (see description
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #10 from Andreas Krebbel ---
Author: krebbel
Date: Tue Apr 25 11:11:48 2017
New Revision: 247189
URL: https://gcc.gnu.org/viewcvs?rev=247189&root=gcc&view=rev
Log:
S/390: PR80080: Optimize atomic patterns.
The attached patch optimiz
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #9 from Andreas Krebbel ---
Author: krebbel
Date: Tue Apr 25 07:37:50 2017
New Revision: 247132
URL: https://gcc.gnu.org/viewcvs?rev=247132&root=gcc&view=rev
Log:
S/390: PR80080: Optimize atomic patterns.
The attached patch optimize
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #8 from Dominik Vogt ---
The patch has a performance regression on s390x.
.L1
lr %r3,%r1
cs %r1,%r4,0(%r2)
jne .L1
becomes
.L1
cs %r1,%r3,0(%r2)
ipm %r4
sra %r4,28
cijne %r4,0,.L1
Alth
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #7 from Dominik Vogt ---
(In reply to Jakub Jelinek from comment #6)
> I think it depends on what
> (success, old_reg) = compare-and-swap(mem, old_reg, new_reg)
> sets if success is true. Is there a guarantee that old_reg will be ass
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #6 from Jakub Jelinek ---
I think it depends on what
(success, old_reg) = compare-and-swap(mem, old_reg, new_reg)
sets if success is true. Is there a guarantee that old_reg will be assigned
whatever has been passed as the second argu
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #5 from Dominik Vogt ---
What case do you mean? The
+ if (oldval != old_reg)
+emit_move_insn (old_reg, oldval);
at the end should make sure that the oldval-rtx is either not changed by the
call, or its value is copied into old
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
Jakub Jelinek changed:
What|Removed |Added
CC||jakub at gcc dot gnu.org
--- Comment #4
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
Dominik Vogt changed:
What|Removed |Added
CC||vogt at linux dot vnet.ibm.com
--- Commen
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
Andreas Krebbel changed:
What|Removed |Added
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
Richard Biener changed:
What|Removed |Added
Keywords||missed-optimization
--- Comment #1 from
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