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optimization/9752: gcc generates bad code when -fgcse or -frerun-cse-after-loop used
- From: aaronw at net dot com
- To: gcc-gnats at gcc dot gnu dot org
- Date: 19 Feb 2003 04:14:19 -0000
- Subject: optimization/9752: gcc generates bad code when -fgcse or -frerun-cse-after-loop used
- Reply-to: aaronw at net dot com
>Number: 9752
>Category: optimization
>Synopsis: gcc generates bad code when -fgcse or -frerun-cse-after-loop used
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Wed Feb 19 04:16:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Aaron Williams
>Release: g++ 3.2.2
>Organization:
>Environment:
Sparc Sun Solaris 2.7, 32-bit environment
>Description:
When I compile ui.cpp with -O2 as part of KDE in kdeaddons-3.1/noatun-plugins/tippercanoe/ I get link errors:
ld: warning: relocation error: R_SPARC_32: file ui.o: symbol .LLC23:
external symbolic relocation against non-allocatable section .stab;
cannot be processed at runtime: relocation ignored
ld: warning: relocation error: R_SPARC_32: file ui.o: symbol .LLC86:
external symbolic relocation against non-allocatable section .stab;
cannot be processed at runtime: relocation ignored
Undefined first referenced
symbol in file
.LLC86 ui.o
.LLC23 ui.o
ld: fatal: Symbol referencing errors. No output written to noatuntippecanoe.bin
collect2: ld returned 1 exit status
*** Error code 1
According to the .s file, the following parameters were used for compiling:
! GNU C++ version 3.2.2 (sparc-sun-solaris2.7)
! compiled by GNU C version 2.95.3 20010315 (release).
! options passed: -I. -I. -I../.. -I/tools/kde/3.1gcc/include
! -I/tools/qt/qt-3.1.1gcc/include -I/tools/qt/share/include
! -I/tools/qt/share/include -I/tools/qt/share/include/SDL
! -I/tools/qt/share/include -iprefix -D__GNUC__=3 -D__GNUC_MINOR__=2
! -D__GNUC_PATCHLEVEL__=2 -D__GXX_ABI_VERSION=102 -Dsparc -Dsun -Dunix
! -D__svr4__ -D__SVR4 -D__PRAGMA_REDEFINE_EXTNAME -D__sparc__ -D__sun__
! -D__unix__ -D__svr4__ -D__SVR4 -D__PRAGMA_REDEFINE_EXTNAME -D__sparc
! -D__sun -D__unix -Asystem=unix -Asystem=svr4 -D__OPTIMIZE__
! -D__STDC_HOSTED__=1 -D_XOPEN_SOURCE=500 -D_LARGEFILE_SOURCE=1
! -D_LARGEFILE64_SOURCE=1 -D__EXTENSIONS__ -D__SIZE_TYPE__=unsigned int
! -D__PTRDIFF_TYPE__=int -D__WCHAR_TYPE__=long int -D__WINT_TYPE__=long int
! -D__GCC_NEW_VARARGS__ -Acpu=sparc -Amachine=sparc -DHAVE_CONFIG_H
! -D_REENTRANT -DQT_THREAD_SUPPORT -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS
! -DUSE_SOLARIS -DSVR4 -DNDEBUG -DNO_DEBUG -DQT_CLEAN_NAMESPACE
! -DQT_NO_COMPAT -DQT_NO_ASCII_CAST -D__GNUG__=3 -D__DEPRECATED -g -O2
! -Wnon-virtual-dtor -Wno-long-long -Wundef -Wall -W -Wpointer-arith
! -Wmissing-prototypes -Wwrite-strings -pedantic -fno-exceptions
! -fno-check-new -fverbose-asm
! options enabled: -fdefer-pop -fomit-frame-pointer
! -foptimize-sibling-calls -fcse-follow-jumps -fcse-skip-blocks
! -fexpensive-optimizations -fthread-jumps -fstrength-reduce -fpeephole
! -fforce-mem -ffunction-cse -fkeep-static-consts -fcaller-saves
! -fpcc-struct-return -fdelayed-branch -fgcse -fgcse-lm -fgcse-sm
! -frerun-cse-after-loop -frerun-loop-opt -fdelete-null-pointer-checks
! -fschedule-insns -fschedule-insns2 -fsched-interblock -fsched-spec
! -fbranch-count-reg -freorder-blocks -fcprop-registers -fcommon
! -fverbose-asm -fgnu-linker -fregmove -foptimize-register-move
! -fargument-alias -fstrict-aliasing -fmerge-constants -fident -fpeephole2
! -fguess-branch-probability -fmath-errno -ftrapping-math
If instead of -O2 I use -O1 and all of the aboce -fxxx options except -fgcse and -frerun-cse-after-loop then everything links fine.
Looking at the assembly code, I see:
.LLC11:
.asciz "mode"
.align 8
.LLC12:
.asciz "diamonds"
.align 8
.LLC13:
.asciz "brightness"
.align 8
.LLC15:
.asciz "starsize"
.align 8
.LLC17:
.asciz "FGRed"
.align 8
.LLC19:
.asciz "FGgreen"
.align 8
.LLC21:
.asciz "BGRed"
.align 8
.LLC22:
.asciz "BGGreen"
.align 8
.LLC18:
.long 0
.long 0
.align 8
.LLC20:
.long 1072693248
.long 0
.align 8
.LLC24:
.long 1073086464
.long 0
.align 8
.LLC25:
.long 1068708659
.long 858993459
.align 8
Searching for .LLC23 I see the following:
...
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC23
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB24-_ZN9InterfaceC2Ev
.stabn 224,0,0,.LLBE24-_ZN9InterfaceC2Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC23
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB27-_ZN9InterfaceC2Ev
.stabn 224,0,0,.LLBE27-_ZN9InterfaceC2Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC23
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB29-_ZN9InterfaceC2Ev
.stabn 224,0,0,.LLBE29-_ZN9InterfaceC2Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC23
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB32-_ZN9InterfaceC2Ev
.stabn 224,0,0,.LLBE32-_ZN9InterfaceC2Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC23
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB34-_ZN9InterfaceC2Ev
...
and .LLC86 I see:
.stabs "_x:V(0,15)",38,0,177,.LLC86
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB201-_ZN9InterfaceC1Ev
.stabn 224,0,0,.LLBE201-_ZN9InterfaceC1Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC86
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB204-_ZN9InterfaceC1Ev
.stabn 224,0,0,.LLBE204-_ZN9InterfaceC1Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC86
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB206-_ZN9InterfaceC1Ev
.stabn 224,0,0,.LLBE206-_ZN9InterfaceC1Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC86
.stabs "_width:r(0,15)",64,0,177,34
.stabn 192,0,0,.LLBB209-_ZN9InterfaceC1Ev
.stabn 224,0,0,.LLBE209-_ZN9InterfaceC1Ev
.stabs "_am:r(0,1)",64,0,177,16
.stabs "_vm:r(0,1)",64,0,177,10
.stabs "_x:V(0,15)",38,0,177,.LLC86
The section of the .S file where I guess .LLC86 should be looks like:
.LLC84:
.long 0
.long 0
.align 8
.LLC85:
.long 1072693248
.long 0
.align 8
.LLC87:
.long 1073086464
.long 0
.align 8
.LLC88:
.long 1068708659
.long 858993459
.align 8
.LLC89:
.long 1068079513
.long -1717986918
.align 8
Let me know if more information is needed.
All of the files were taken from KDE 3.1 kdeaddons.
>How-To-Repeat:
Compile kdeaddons-3.1/noatun-plugins/tippercanoe/ui.cpp and attempt to link.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="ui.cpp"
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