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* [Bug target/16294] New: Missed delay slot scheduling opportunity
@ 2004-06-30 11:09 ebotcazou at gcc dot gnu dot org
2004-07-01 1:06 ` [Bug target/16294] [3.5 Regression] " pinskia at gcc dot gnu dot org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2004-06-30 11:09 UTC (permalink / raw)
To: gcc-bugs
The RTL prologue/epilogue patch for SPARC:
http://gcc.gnu.org/ml/gcc-patches/2004-06/msg01049.html
introduced a regression with regard to delay slot scheduling and branches.
For the testcase:
void f (double*a, int m)
{
int j;
for(j=0; j<m; j++)
a[j]=1;
}
compiled at -O2 -mcpu=ultrasparc, the diff looks like:
@@ -12,10 +12,9 @@
.type f, #function
.proc 04
f:
- !#PROLOGUE# 0
- !#PROLOGUE# 1
cmp %o1, 0
- ble,pn %icc, .LL5
+ ble,pn %icc, .LL8
+ nop
sethi %hi(.LLC0), %g1
mov 0, %o5
ldd [%g1+%lo(.LLC0)], %f8
@@ -25,9 +24,9 @@
cmp %o1, %o5
bg,pt %icc, .LL4
std %f8, [%o0+%g1]
-.LL5:
- retl
- nop
+.LL8:
+ jmp %o7+8
+ nop
.size f, .-f
.section ".rodata"
.align 8
For testsuite/gcc.c-torture/compile/990517-1.c, the diff is:
@@ -7,9 +7,7 @@
.type sdbm__splpage, #function
.proc 020
sdbm__splpage:
- !#PROLOGUE# 0
save %sp, -1168, %sp
- !#PROLOGUE# 1
add %fp, -1056, %l6
mov %i0, %o1
mov 1024, %o2
@@ -26,7 +24,8 @@
mov 1024, %o2
ldsh [%fp-1056], %l4
cmp %l4, 0
- ble,pn %icc, .LL1
+ ble,pn %icc, .LL10
+ nop
mov 1024, %l3
add %fp, -1064, %i5
add %fp, -1072, %l7
@@ -59,8 +58,8 @@
cmp %l4, 0
bg,pt %icc, .LL4
add %l5, 4, %l5
-.LL1:
+.LL10:
return %i7+8
- nop
+ nop
.size sdbm__splpage, .-sdbm__splpage
.ident "GCC: (GNU) 3.5.0 20040620 (experimental)"
It appears that the compiler fails to realize that the value of the register
doesn't matter on the non-fallthru edge pointing to the return.
--
Summary: Missed delay slot scheduling opportunity
Product: gcc
Version: 3.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ebotcazou at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: sparc*-*-*
GCC host triplet: sparc*-*-*
GCC target triplet: sparc*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16294
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/16294] [3.5 Regression] Missed delay slot scheduling opportunity
2004-06-30 11:09 [Bug target/16294] New: Missed delay slot scheduling opportunity ebotcazou at gcc dot gnu dot org
@ 2004-07-01 1:06 ` pinskia at gcc dot gnu dot org
2004-07-07 13:44 ` ebotcazou at gcc dot gnu dot org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-07-01 1:06 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Summary|Missed delay slot scheduling|[3.5 Regression] Missed
|opportunity |delay slot scheduling
| |opportunity
Target Milestone|--- |3.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16294
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/16294] [3.5 Regression] Missed delay slot scheduling opportunity
2004-06-30 11:09 [Bug target/16294] New: Missed delay slot scheduling opportunity ebotcazou at gcc dot gnu dot org
2004-07-01 1:06 ` [Bug target/16294] [3.5 Regression] " pinskia at gcc dot gnu dot org
@ 2004-07-07 13:44 ` ebotcazou at gcc dot gnu dot org
2004-07-11 12:43 ` [Bug rtl-optimization/16294] " ebotcazou at gcc dot gnu dot org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2004-07-07 13:44 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2004-07-07 13:44 -------
Investigating.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |ebotcazou at gcc dot gnu dot
|dot org |org
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2004-07-07 13:44:21
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16294
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/16294] [3.5 Regression] Missed delay slot scheduling opportunity
2004-06-30 11:09 [Bug target/16294] New: Missed delay slot scheduling opportunity ebotcazou at gcc dot gnu dot org
2004-07-01 1:06 ` [Bug target/16294] [3.5 Regression] " pinskia at gcc dot gnu dot org
2004-07-07 13:44 ` ebotcazou at gcc dot gnu dot org
@ 2004-07-11 12:43 ` ebotcazou at gcc dot gnu dot org
2004-07-11 23:16 ` giovannibajo at libero dot it
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2004-07-11 12:43 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2004-07-11 12:43 -------
Testing various patches against the reorg pass.
--
What |Removed |Added
----------------------------------------------------------------------------
Component|target |rtl-optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16294
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/16294] [3.5 Regression] Missed delay slot scheduling opportunity
2004-06-30 11:09 [Bug target/16294] New: Missed delay slot scheduling opportunity ebotcazou at gcc dot gnu dot org
` (2 preceding siblings ...)
2004-07-11 12:43 ` [Bug rtl-optimization/16294] " ebotcazou at gcc dot gnu dot org
@ 2004-07-11 23:16 ` giovannibajo at libero dot it
2004-07-17 18:12 ` cvs-commit at gcc dot gnu dot org
2004-07-17 18:15 ` ebotcazou at gcc dot gnu dot org
5 siblings, 0 replies; 7+ messages in thread
From: giovannibajo at libero dot it @ 2004-07-11 23:16 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From giovannibajo at libero dot it 2004-07-11 23:16 -------
Patch posted:
http://gcc.gnu.org/ml/gcc-patches/2004-07/msg01167.html
--
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16294
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/16294] [3.5 Regression] Missed delay slot scheduling opportunity
2004-06-30 11:09 [Bug target/16294] New: Missed delay slot scheduling opportunity ebotcazou at gcc dot gnu dot org
` (3 preceding siblings ...)
2004-07-11 23:16 ` giovannibajo at libero dot it
@ 2004-07-17 18:12 ` cvs-commit at gcc dot gnu dot org
2004-07-17 18:15 ` ebotcazou at gcc dot gnu dot org
5 siblings, 0 replies; 7+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2004-07-17 18:12 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-07-17 18:12 -------
Subject: Bug 16294
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: ebotcazou@gcc.gnu.org 2004-07-17 18:12:38
Modified files:
gcc : ChangeLog resource.c
Log message:
PR rtl-optimization/16294
* resource.c (return_insn_p): New predicate.
(mark_target_live_regs): Use it. Special-case return insns.
(init_resource_info): Use it. Don't scan the epilogue past
a return.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.4586&r2=2.4587
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/resource.c.diff?cvsroot=gcc&r1=1.71&r2=1.72
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16294
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/16294] [3.5 Regression] Missed delay slot scheduling opportunity
2004-06-30 11:09 [Bug target/16294] New: Missed delay slot scheduling opportunity ebotcazou at gcc dot gnu dot org
` (4 preceding siblings ...)
2004-07-17 18:12 ` cvs-commit at gcc dot gnu dot org
@ 2004-07-17 18:15 ` ebotcazou at gcc dot gnu dot org
5 siblings, 0 replies; 7+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2004-07-17 18:15 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2004-07-17 18:15 -------
Patch commited (with a slight tweak).
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16294
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2004-07-17 18:15 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-06-30 11:09 [Bug target/16294] New: Missed delay slot scheduling opportunity ebotcazou at gcc dot gnu dot org
2004-07-01 1:06 ` [Bug target/16294] [3.5 Regression] " pinskia at gcc dot gnu dot org
2004-07-07 13:44 ` ebotcazou at gcc dot gnu dot org
2004-07-11 12:43 ` [Bug rtl-optimization/16294] " ebotcazou at gcc dot gnu dot org
2004-07-11 23:16 ` giovannibajo at libero dot it
2004-07-17 18:12 ` cvs-commit at gcc dot gnu dot org
2004-07-17 18:15 ` ebotcazou at gcc dot gnu dot org
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