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* [Bug tree-optimization/30288] New: tail call with additional arguments
@ 2006-12-24 23:08 tkoenig at gcc dot gnu dot org
2006-12-25 2:38 ` [Bug target/30288] " pinskia at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2006-12-24 23:08 UTC (permalink / raw)
To: gcc-bugs
This tail call could be optimized: Just
push the final 0, then jump.
$ cat tail.c
int foo (int, int);
int bar (int i)
{
return foo (i, 0);
}
$ gcc -fomit-frame-pointer -S -O3 tail.c
$ cat tail.s
.file "tail.c"
.text
.p2align 4,,15
.globl bar
.type bar, @function
bar:
subl $12, %esp
movl 16(%esp), %eax
movl $0, 4(%esp)
movl %eax, (%esp)
call foo
addl $12, %esp
ret
.size bar, .-bar
.ident "GCC: (GNU) 4.3.0 20061211 (experimental)"
.section .note.GNU-stack,"",@progbits
--
Summary: tail call with additional arguments
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tkoenig at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30288
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/30288] tail call with additional arguments
2006-12-24 23:08 [Bug tree-optimization/30288] New: tail call with additional arguments tkoenig at gcc dot gnu dot org
@ 2006-12-25 2:38 ` pinskia at gcc dot gnu dot org
2006-12-25 2:40 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-12-25 2:38 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2006-12-25 02:38 -------
This is a target specific issue because it works correctly on ppc where you
pass via registers.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|tree-optimization |target
GCC target triplet| |i?86-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30288
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/30288] tail call with additional arguments
2006-12-24 23:08 [Bug tree-optimization/30288] New: tail call with additional arguments tkoenig at gcc dot gnu dot org
2006-12-25 2:38 ` [Bug target/30288] " pinskia at gcc dot gnu dot org
@ 2006-12-25 2:40 ` pinskia at gcc dot gnu dot org
2006-12-27 2:34 ` pinskia at gcc dot gnu dot org
2007-01-07 0:59 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-12-25 2:40 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30288
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/30288] tail call with additional arguments
2006-12-24 23:08 [Bug tree-optimization/30288] New: tail call with additional arguments tkoenig at gcc dot gnu dot org
2006-12-25 2:38 ` [Bug target/30288] " pinskia at gcc dot gnu dot org
2006-12-25 2:40 ` pinskia at gcc dot gnu dot org
@ 2006-12-27 2:34 ` pinskia at gcc dot gnu dot org
2007-01-07 0:59 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-12-27 2:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2006-12-27 02:34 -------
Just to show this works in general, here is the result for powerpc-darwin:
_bar:
li r4,0
b _foo
Also I don't think push will work as it can cause the stack to become
unaligned.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30288
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/30288] tail call with additional arguments
2006-12-24 23:08 [Bug tree-optimization/30288] New: tail call with additional arguments tkoenig at gcc dot gnu dot org
` (2 preceding siblings ...)
2006-12-27 2:34 ` pinskia at gcc dot gnu dot org
@ 2007-01-07 0:59 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-01-07 0:59 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from pinskia at gcc dot gnu dot org 2007-01-07 00:58 -------
Confirmed, a x86 only issue.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-01-07 00:58:54
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30288
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-01-07 0:59 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2006-12-24 23:08 [Bug tree-optimization/30288] New: tail call with additional arguments tkoenig at gcc dot gnu dot org
2006-12-25 2:38 ` [Bug target/30288] " pinskia at gcc dot gnu dot org
2006-12-25 2:40 ` pinskia at gcc dot gnu dot org
2006-12-27 2:34 ` pinskia at gcc dot gnu dot org
2007-01-07 0:59 ` pinskia at gcc dot gnu dot org
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