* [Bug optimization/11708] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
@ 2003-07-29 13:46 ` naveens at noida dot hcltech dot com
2003-07-29 13:48 ` pinskia at physics dot uc dot edu
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From: naveens at noida dot hcltech dot com @ 2003-07-29 13:46 UTC (permalink / raw)
To: gcc-bugs
PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
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------- Additional Comments From naveens at noida dot hcltech dot com 2003-07-29 13:46 -------
Created an attachment (id=4505)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=4505&action=view)
Preprocessed file to reproduce the bug.
compile with
sh-elf-gcc -ml -m4 -S -O2 -dA BUG.c to get the assembler dump.
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* [Bug optimization/11708] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
2003-07-29 13:46 ` [Bug optimization/11708] " naveens at noida dot hcltech dot com
@ 2003-07-29 13:48 ` pinskia at physics dot uc dot edu
2003-07-29 14:10 ` naveens at noida dot hcltech dot com
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From: pinskia at physics dot uc dot edu @ 2003-07-29 13:48 UTC (permalink / raw)
To: gcc-bugs
PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
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pinskia at physics dot uc dot edu changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |pessimizes-code
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* [Bug optimization/11708] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
2003-07-29 13:46 ` [Bug optimization/11708] " naveens at noida dot hcltech dot com
2003-07-29 13:48 ` pinskia at physics dot uc dot edu
@ 2003-07-29 14:10 ` naveens at noida dot hcltech dot com
2003-07-29 14:20 ` [Bug optimization/11708] [sh4-elf-gcc] " naveens at noida dot hcltech dot com
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From: naveens at noida dot hcltech dot com @ 2003-07-29 14:10 UTC (permalink / raw)
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------- Additional Comments From naveens at noida dot hcltech dot com 2003-07-29 14:10 -------
It seems, delay slot scheduling has the responsibility of generating
optimal code here.
In fact, it is able to do the required transformation in some cases. e.g.
Consider this part of the assembler
with -fno-delayed-branch -O2 -ml -m4 -S -dA
! basic block 25
cmp/pl r3
mov.w .L147,r1
bt .L203
bra .L93
nop
.L203:
.L36:
! basic block 26
..... snipped ...
.L93:
! basic block 69
mov #0,r1
bra .L36
nop
.align 5
With -fdelayed-branch, this is optimized to:
! basic block 25
cmp/pl r3
mov.w .L147,r1
bt .L36
mov #0,r1
.L36:
! basic block 26
mov.w .L136,r3
mov.w .L149,r2
add r1,r3
mov.w .L150,r1
cmp/gt r1,r3
So, it seems that delayed branch scheduling is able to
optimize some cases, but misses some. I will try to
confirm the reason.
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* [Bug optimization/11708] [sh4-elf-gcc] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
` (2 preceding siblings ...)
2003-07-29 14:10 ` naveens at noida dot hcltech dot com
@ 2003-07-29 14:20 ` naveens at noida dot hcltech dot com
2003-08-11 12:42 ` pinskia at gcc dot gnu dot org
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From: naveens at noida dot hcltech dot com @ 2003-07-29 14:20 UTC (permalink / raw)
To: gcc-bugs
PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
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naveens at noida dot hcltech dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Non-Optimal jump code |[sh4-elf-gcc] Non-Optimal
|generation. |jump code generation.
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* [Bug optimization/11708] [sh4-elf-gcc] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
` (3 preceding siblings ...)
2003-07-29 14:20 ` [Bug optimization/11708] [sh4-elf-gcc] " naveens at noida dot hcltech dot com
@ 2003-08-11 12:42 ` pinskia at gcc dot gnu dot org
2003-08-11 17:48 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2003-08-11 12:42 UTC (permalink / raw)
To: gcc-bugs
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|3.4 |---
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* [Bug optimization/11708] [sh4-elf-gcc] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
` (4 preceding siblings ...)
2003-08-11 12:42 ` pinskia at gcc dot gnu dot org
@ 2003-08-11 17:48 ` pinskia at gcc dot gnu dot org
2003-08-25 0:04 ` dhazeghi at yahoo dot com
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From: pinskia at gcc dot gnu dot org @ 2003-08-11 17:48 UTC (permalink / raw)
To: gcc-bugs
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
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* [Bug optimization/11708] [sh4-elf-gcc] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
` (5 preceding siblings ...)
2003-08-11 17:48 ` pinskia at gcc dot gnu dot org
@ 2003-08-25 0:04 ` dhazeghi at yahoo dot com
2003-09-17 7:20 ` naveens at noida dot hcltech dot com
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From: dhazeghi at yahoo dot com @ 2003-08-25 0:04 UTC (permalink / raw)
To: gcc-bugs
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dhazeghi at yahoo dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2003-08-25 00:04:00
date| |
------- Additional Comments From dhazeghi at yahoo dot com 2003-08-25 00:03 -------
Confirmed with mainline (20030824).
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* [Bug optimization/11708] [sh4-elf-gcc] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
` (6 preceding siblings ...)
2003-08-25 0:04 ` dhazeghi at yahoo dot com
@ 2003-09-17 7:20 ` naveens at noida dot hcltech dot com
2004-01-03 19:46 ` pinskia at gcc dot gnu dot org
2004-01-05 6:01 ` naveens at noida dot hcltech dot com
9 siblings, 0 replies; 11+ messages in thread
From: naveens at noida dot hcltech dot com @ 2003-09-17 7:20 UTC (permalink / raw)
To: gcc-bugs
PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
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------- Additional Comments From naveens at noida dot hcltech dot com 2003-09-17 07:02 -------
Something weird has happened on the mainline.
I don't get any assembler ouput (-O2 -m4 -ml) for this test case,
when I compile with snapshot of 12th Sep, 2003.
Anybody else seeing this sort of a problem or there is something
wrong in my environment ?
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* [Bug optimization/11708] [sh4-elf-gcc] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
` (7 preceding siblings ...)
2003-09-17 7:20 ` naveens at noida dot hcltech dot com
@ 2004-01-03 19:46 ` pinskia at gcc dot gnu dot org
2004-01-05 6:01 ` naveens at noida dot hcltech dot com
9 siblings, 0 replies; 11+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-01-03 19:46 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-01-03 19:45 -------
no -O2 enables -funit-at-a-time which removes static functions, remove the static from the
file and it should produce code.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11708
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* [Bug optimization/11708] [sh4-elf-gcc] Non-Optimal jump code generation.
2003-07-29 13:42 [Bug optimization/11708] New: Non-Optimal jump code generation naveens at noida dot hcltech dot com
` (8 preceding siblings ...)
2004-01-03 19:46 ` pinskia at gcc dot gnu dot org
@ 2004-01-05 6:01 ` naveens at noida dot hcltech dot com
9 siblings, 0 replies; 11+ messages in thread
From: naveens at noida dot hcltech dot com @ 2004-01-05 6:01 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From naveens at noida dot hcltech dot com 2004-01-05 06:01 -------
Yes, thats right !! although it wasn't obvious immediately.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11708
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