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* [Bug middle-end/15513] New: loop peeling failed @ 2004-05-18 22:16 kunert at physik dot tu-dresden dot de 2004-05-18 22:49 ` [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start pinskia at gcc dot gnu dot org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: kunert at physik dot tu-dresden dot de @ 2004-05-18 22:16 UTC (permalink / raw) To: gcc-bugs The code: double ff( double* x ) { double a=0; for( int p = 0; p < 2; ++p ) for( int q = p; q < 2; ++q ) a += x[q]; return a; } compiled with /opt/gcc34/bin/g++ -save-temps -O3 -c xtest.cc -fpeel-loops results in assembler code that still contains the loops, instead of the obvious straightforward code. Regards, Thomas Kunert .file "xtest.cc" .text .align 2 .p2align 4,,15 .globl _Z2ffPd .type _Z2ffPd, @function _Z2ffPd: .LFB2: pushl %ebp .LCFI0: fldz movl %esp, %ebp .LCFI1: movl 8(%ebp), %ecx xorl %edx, %edx .L9: cmpl $1, %edx movl %edx, %eax jle .L14 .L13: incl %edx cmpl $1, %edx jle .L9 popl %ebp ret .p2align 4,,7 .L14: faddl (%ecx,%eax,8) incl %eax cmpl $1, %eax jg .L13 faddl (%ecx,%eax,8) incl %eax cmpl $1, %eax jle .L14 jmp .L13 .LFE2: .size _Z2ffPd, .-_Z2ffPd .section .note.GNU-stack,"",@progbits .ident "GCC: (GNU) 3.4.0" [kunert@ptpp80 dymol]$ /opt/gcc34/bin/g++ -v Reading specs from /opt/gcc34/lib/gcc/i686-pc-linux-gnu/3.4.0/specs Configured with: ../configure --enable-shared --disable-checking --with-arch=pentiumpro --prefix=/opt/gcc34 --enable-__cxa_atexit --enable-languages=c,c++ Thread model: posix gcc version 3.4.0 -- Summary: loop peeling failed Product: gcc Version: 3.4.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: kunert at physik dot tu-dresden dot de CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15513 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start 2004-05-18 22:16 [Bug middle-end/15513] New: loop peeling failed kunert at physik dot tu-dresden dot de @ 2004-05-18 22:49 ` pinskia at gcc dot gnu dot org 2004-05-18 22:50 ` 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 @ 2004-05-18 22:49 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-18 11:37 ------- Confirmed, but since the inner loop does not constant start, it is not peeled or unrolled. This is very simular to bug 10624. -- What |Removed |Added ---------------------------------------------------------------------------- BugsThisDependsOn| |10624 Severity|normal |enhancement Status|UNCONFIRMED |NEW Component|middle-end |rtl-optimization Ever Confirmed| |1 Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2004-05-18 11:37:53 date| | Summary|loop peeling failed |loop peeling failed becuase | |of non-constant start http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15513 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start 2004-05-18 22:16 [Bug middle-end/15513] New: loop peeling failed kunert at physik dot tu-dresden dot de 2004-05-18 22:49 ` [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start pinskia at gcc dot gnu dot org @ 2004-05-18 22:50 ` pinskia at gcc dot gnu dot org 2004-08-20 17:14 ` pinskia at gcc dot gnu dot org 2005-05-12 17:36 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-05-18 22:50 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-18 11:38 ------- Suspending as PR 10624 is also suspended. -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |SUSPENDED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15513 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start 2004-05-18 22:16 [Bug middle-end/15513] New: loop peeling failed kunert at physik dot tu-dresden dot de 2004-05-18 22:49 ` [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start pinskia at gcc dot gnu dot org 2004-05-18 22:50 ` pinskia at gcc dot gnu dot org @ 2004-08-20 17:14 ` pinskia at gcc dot gnu dot org 2005-05-12 17:36 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-08-20 17:14 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-08-20 17:14 ------- I should note that there is some hope about getting this fixed but I do not know how much. -- What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed|2004-05-18 11:37:53 |2004-08-20 17:14:19 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15513 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start 2004-05-18 22:16 [Bug middle-end/15513] New: loop peeling failed kunert at physik dot tu-dresden dot de ` (2 preceding siblings ...) 2004-08-20 17:14 ` pinskia at gcc dot gnu dot org @ 2005-05-12 17:36 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-05-12 17:36 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-05-12 17:36 ------- Actually this is a dup of bug 10624. *** This bug has been marked as a duplicate of 10624 *** -- What |Removed |Added ---------------------------------------------------------------------------- Status|SUSPENDED |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15513 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2005-05-12 17:36 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-05-18 22:16 [Bug middle-end/15513] New: loop peeling failed kunert at physik dot tu-dresden dot de 2004-05-18 22:49 ` [Bug rtl-optimization/15513] loop peeling failed becuase of non-constant start pinskia at gcc dot gnu dot org 2004-05-18 22:50 ` pinskia at gcc dot gnu dot org 2004-08-20 17:14 ` pinskia at gcc dot gnu dot org 2005-05-12 17:36 ` pinskia at gcc dot gnu dot org
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