public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code @ 2005-10-14 11:03 tromp at cwi dot nl 2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: tromp at cwi dot nl @ 2005-10-14 11:03 UTC (permalink / raw) To: gcc-bugs -bash-3.00$ gcc -v Using built-in specs. Target: i386-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,java,f95,ada --enable-java-awt=gtk --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --host=i386-redhat-linux Thread model: posix gcc version 4.0.1 20050727 (Red Hat 4.0.1-5) The program below produces incorrect results with -O2 and higher, which I've deduced is due to the combined options -fcse-follow-jumps -fforce-mem #include <stdlib.h> #include <stdio.h> typedef unsigned long Word_t; typedef struct { unsigned char type; unsigned char color; unsigned char left; unsigned char right; } cell; //possible cell types #define WIDTH 3 typedef cell bstate[WIDTH]; // borderstate void wordtostate(Word_t s, int bump, bstate state) { char stack[WIDTH]; int sp,i,type,leftcolor=0; cell *sti; for (sti = &state[i = sp = 0]; i < WIDTH; sti++, i++) { sti->type = type = (s >> (3*i)) & 7; sti->left = sti->right = i; sti->color = leftcolor ^ 1; // assume opposite color if (type & 2) { sti->right = state[sti->left = stack[--sp]].right; state[sti->left].right = state[sti->right].left = i; sti->color ^= (sti->left == i-1); // check color assumption } if (type & 1) stack[sp++] = i; leftcolor = sti->color; } } int main() { bstate state; Word_t s = 0675; wordtostate(s, 0, state); printf("%s\n", state[1].color ? "OK" : "BUG"); return 0; } -- Summary: Optimizations -fcse-follow-jumps -fforce-mem break code Product: gcc Version: 4.0.1 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tromp at cwi dot nl http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code 2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl @ 2005-10-14 13:07 ` pinskia at gcc dot gnu dot org 2005-10-15 17:54 ` 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 @ 2005-10-14 13:07 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from pinskia at gcc dot gnu dot org 2005-10-14 13:07 ------- I think this has been fixed in 4.0.3 by the patch for PR 23324 but I need someone to test. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- GCC target triplet| |i686-pc-linux-gnu Keywords| |wrong-code Summary|Optimizations -fcse-follow- |[4.0 regression] |jumps -fforce-mem break code|Optimizations -fcse-follow- | |jumps -fforce-mem break code Target Milestone|--- |4.0.3 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code 2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl 2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org @ 2005-10-15 17:54 ` pinskia at gcc dot gnu dot org 2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org 2007-02-03 15:46 ` gdr at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-10-15 17:54 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from pinskia at gcc dot gnu dot org 2005-10-15 17:54 ------- Confirmed, still fails on the 4.0 branch. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Known to fail| |4.0.3 Known to work| |4.1.0 Last reconfirmed|0000-00-00 00:00:00 |2005-10-15 17:54:19 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code 2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl 2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org 2005-10-15 17:54 ` pinskia at gcc dot gnu dot org @ 2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org 2007-02-03 15:46 ` gdr at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: mmitchel at gcc dot gnu dot org @ 2006-03-11 3:18 UTC (permalink / raw) To: gcc-bugs -- mmitchel at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|4.0.3 |4.0.4 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/24361] [4.0 regression] Optimizations -fcse-follow-jumps -fforce-mem break code 2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl ` (2 preceding siblings ...) 2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org @ 2007-02-03 15:46 ` gdr at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: gdr at gcc dot gnu dot org @ 2007-02-03 15:46 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from gdr at gcc dot gnu dot org 2007-02-03 15:46 ------- Fixed in GCC-4.1.1 and higher. -- gdr at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED Target Milestone|4.0.4 |4.1.1 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24361 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-02-03 15:46 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-10-14 11:03 [Bug c/24361] New: Optimizations -fcse-follow-jumps -fforce-mem break code tromp at cwi dot nl 2005-10-14 13:07 ` [Bug rtl-optimization/24361] [4.0 regression] " pinskia at gcc dot gnu dot org 2005-10-15 17:54 ` pinskia at gcc dot gnu dot org 2006-03-11 3:18 ` mmitchel at gcc dot gnu dot org 2007-02-03 15:46 ` gdr at gcc dot gnu dot org
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).