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* [Bug rtl-optimization/19705] New: [4.0 Regression] cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied @ 2005-01-30 5:58 pinskia at gcc dot gnu dot org 2005-01-30 6:08 ` [Bug rtl-optimization/19705] Cannot " pinskia at gcc dot gnu dot org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-01-30 5:58 UTC (permalink / raw) To: gcc-bugs Hmm, this is werid, why cannot I turn off doloop optimization with the -fno-branch-count-reg when I also turn off ivopts? I should be able to when I want to look at the interaction between those two optimizations (options). Testcase: int foo (int x) { int i= x; do { x *= 2; } while (--i); return x; } Compile with -O2 -fno-branch-count-reg -fno-ivopts and see there still is a bdnz in there. but compile with -O2 -fno-branch-count-reg and you don't get the bdnz. -- Summary: [4.0 Regression] cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: minor Priority: P2 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org GCC target triplet: powerpc-*-darwin* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19705 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/19705] Cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied 2005-01-30 5:58 [Bug rtl-optimization/19705] New: [4.0 Regression] cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied pinskia at gcc dot gnu dot org @ 2005-01-30 6:08 ` pinskia at gcc dot gnu dot org 2005-02-20 19:32 ` pinskia at gcc dot gnu dot org 2005-09-01 14:05 ` amodra at bigpond dot net dot au 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-01-30 6:08 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-30 06:08 ------- Werid it is combine which is doing it. Hmm and this is not a regression. Either the documention needs updating or the targets need to turn off these patterns when -fno- branch-count-reg is supplied. -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |documentation Summary|[4.0 Regression] cannot turn|Cannot turn off doloop |off doloop optimization via |optimization via -fno- |-fno-branch-count-reg if - |branch-count-reg if -fno- |fno-ivopts is also supplied |ivopts is also supplied http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19705 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/19705] Cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied 2005-01-30 5:58 [Bug rtl-optimization/19705] New: [4.0 Regression] cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied pinskia at gcc dot gnu dot org 2005-01-30 6:08 ` [Bug rtl-optimization/19705] Cannot " pinskia at gcc dot gnu dot org @ 2005-02-20 19:32 ` pinskia at gcc dot gnu dot org 2005-09-01 14:05 ` amodra at bigpond dot net dot au 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-02-20 19:32 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-20 14:17 ------- Confirmed, the documention just needs to changed as that -fno-branch-count-reg only turns off the extra analysis and that you can still get code using the branch counter even when using this option. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-02-20 14:17:17 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19705 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/19705] Cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied 2005-01-30 5:58 [Bug rtl-optimization/19705] New: [4.0 Regression] cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied pinskia at gcc dot gnu dot org 2005-01-30 6:08 ` [Bug rtl-optimization/19705] Cannot " pinskia at gcc dot gnu dot org 2005-02-20 19:32 ` pinskia at gcc dot gnu dot org @ 2005-09-01 14:05 ` amodra at bigpond dot net dot au 2 siblings, 0 replies; 4+ messages in thread From: amodra at bigpond dot net dot au @ 2005-09-01 14:05 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From amodra at bigpond dot net dot au 2005-09-01 14:05 ------- Or make the doloop insn patterns conditional on flag_branch_on_count_reg? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19705 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-09-01 14:05 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-01-30 5:58 [Bug rtl-optimization/19705] New: [4.0 Regression] cannot turn off doloop optimization via -fno-branch-count-reg if -fno-ivopts is also supplied pinskia at gcc dot gnu dot org 2005-01-30 6:08 ` [Bug rtl-optimization/19705] Cannot " pinskia at gcc dot gnu dot org 2005-02-20 19:32 ` pinskia at gcc dot gnu dot org 2005-09-01 14:05 ` amodra at bigpond dot net dot au
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