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* [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field [not found] <bug-15310-4@http.gcc.gnu.org/bugzilla/> @ 2014-10-31 4:02 ` pinskia at gcc dot gnu.org 0 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2014-10-31 4:02 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 Bug 15310 depends on bug 15459, which changed state. Bug 15459 Summary: [meta-bug] there should be a tree combiner like the rtl one https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15459 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug optimization/15310] New: [tree-ssa] Optimize an addition in a bit field @ 2004-05-06 8:37 kazu at cs dot umass dot edu 2004-05-16 11:29 ` [Bug tree-optimization/15310] " pinskia at gcc dot gnu dot org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: kazu at cs dot umass dot edu @ 2004-05-06 8:37 UTC (permalink / raw) To: gcc-bugs Optimize an addition in a bit field. struct { unsigned int bit0:1; unsigned int ubyte:31; } sdata; void foo() { sdata.ubyte++; } This testcase is inspired by http://gcc.gnu.org/ml/gcc-patches/2004-05/msg00058.html Currently, I get: foo: movl sdata, %eax movl %eax, %edx shrl %edx leal 2(%edx,%edx), %edx andl $1, %eax orl %edx, %eax movl %eax, sdata ret We should be able to get foo: addl $2, sdata ret We might want to lower bit field manipulation at tree level. -- Summary: [tree-ssa] Optimize an addition in a bit field Product: gcc Version: tree-ssa Status: UNCONFIRMED Keywords: pessimizes-code Severity: enhancement Priority: P2 Component: optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: kazu at cs dot umass dot edu CC: gcc-bugs at gcc dot gnu dot org,roger at eyesopen dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field 2004-05-06 8:37 [Bug optimization/15310] New: " kazu at cs dot umass dot edu @ 2004-05-16 11:29 ` pinskia at gcc dot gnu dot org 2004-05-31 13:18 ` pinskia at gcc dot gnu dot org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-05-16 11:29 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-15 12:27 ------- This could be fixed with a tree combiner. -- What |Removed |Added ---------------------------------------------------------------------------- BugsThisDependsOn| |15459 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field 2004-05-06 8:37 [Bug optimization/15310] New: " kazu at cs dot umass dot edu 2004-05-16 11:29 ` [Bug tree-optimization/15310] " pinskia at gcc dot gnu dot org @ 2004-05-31 13:18 ` pinskia at gcc dot gnu dot org 2004-06-30 10:25 ` cvs-commit at gcc dot gnu dot org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-05-31 13:18 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|3.5.0 |--- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field 2004-05-06 8:37 [Bug optimization/15310] New: " kazu at cs dot umass dot edu 2004-05-16 11:29 ` [Bug tree-optimization/15310] " pinskia at gcc dot gnu dot org 2004-05-31 13:18 ` pinskia at gcc dot gnu dot org @ 2004-06-30 10:25 ` cvs-commit at gcc dot gnu dot org 2004-06-30 22:21 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: cvs-commit at gcc dot gnu dot org @ 2004-06-30 10:25 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-06-30 10:10 ------- Subject: Bug 15310 CVSROOT: /cvs/gcc Module name: gcc Changes by: jakub@gcc.gnu.org 2004-06-30 10:09:55 Modified files: gcc : ChangeLog simplify-rtx.c expr.c gcc/testsuite : ChangeLog Added files: gcc/testsuite/gcc.c-torture/execute: 20040629-1.c Log message: * simplify-rtx.c (simplify_binary_operation): Simplify ((A & N) + B) & M -> (A + B) & M if M is pow2 minus 1 constant and N has at least all bits in M set as well. PR tree-optimization/15310 * expr.c (expand_assignment): Optimize += or -= on a bit field in most significant bits. * gcc.c-torture/execute/20040629-1.c: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.4205&r2=2.4206 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/simplify-rtx.c.diff?cvsroot=gcc&r1=1.194&r2=1.195 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expr.c.diff?cvsroot=gcc&r1=1.657&r2=1.658 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.3919&r2=1.3920 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20040629-1.c.diff?cvsroot=gcc&r1=NONE&r2=1.1 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field 2004-05-06 8:37 [Bug optimization/15310] New: " kazu at cs dot umass dot edu ` (2 preceding siblings ...) 2004-06-30 10:25 ` cvs-commit at gcc dot gnu dot org @ 2004-06-30 22:21 ` pinskia at gcc dot gnu dot org 2004-07-10 0:30 ` pinskia at gcc dot gnu dot org 2004-08-16 16:42 ` cvs-commit at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-06-30 22:21 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-06-30 22:17 ------- Fixed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field 2004-05-06 8:37 [Bug optimization/15310] New: " kazu at cs dot umass dot edu ` (3 preceding siblings ...) 2004-06-30 22:21 ` pinskia at gcc dot gnu dot org @ 2004-07-10 0:30 ` pinskia at gcc dot gnu dot org 2004-08-16 16:42 ` cvs-commit at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-07-10 0:30 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |3.5.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field 2004-05-06 8:37 [Bug optimization/15310] New: " kazu at cs dot umass dot edu ` (4 preceding siblings ...) 2004-07-10 0:30 ` pinskia at gcc dot gnu dot org @ 2004-08-16 16:42 ` cvs-commit at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: cvs-commit at gcc dot gnu dot org @ 2004-08-16 16:42 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-08-16 16:42 ------- Subject: Bug 15310 CVSROOT: /cvs/gcc Module name: gcc Branch: gcc-3_4-rhl-branch Changes by: jakub@gcc.gnu.org 2004-08-16 16:42:16 Modified files: gcc : ChangeLog expr.c simplify-rtx.c gcc/testsuite : ChangeLog Added files: gcc/testsuite/gcc.c-torture/execute: 20040629-1.c 20040705-1.c 20040705-2.c 20040709-1.c 20040709-2.c Log message: 2004-07-09 Jakub Jelinek <jakub@redhat.com> * expr.c (expand_assignment): Reenable bitfield += optimizations. Use alias set 0 for memory, do proper mode calculations and adjust address for memories. * gcc.c-torture/execute/20040709-1.c: New test. * gcc.c-torture/execute/20040709-2.c: New test. 2004-07-05 Jakub Jelinek <jakub@redhat.com> * expr.c (expand_assignment): Disable the bitfield += optimizations. * gcc.c-torture/execute/20040629-1.c (FIELDS1, FIELDS2): Define to nothing if not yet defined. Use it in b, c and d type definitions. * gcc.c-torture/execute/20040705-1.c: New test. * gcc.c-torture/execute/20040705-2.c: New test. 2004-07-01 Jakub Jelinek <jakub@redhat.com> * expr.c (expand_assignment): Optimize bitfld += cst for 1 bit bitfields as well. STRIP_NOPS from src operand and PLUS_EXPR's first operand. Don't optimize if the bitfield is volatile. 2004-06-29 Jakub Jelinek <jakub@redhat.com> * simplify-rtx.c (simplify_binary_operation): Simplify ((A & N) + B) & M -> (A + B) & M if M is pow2 minus 1 constant and N has at least all bits in M set as well. PR tree-optimization/15310 * expr.c (expand_assignment): Optimize += or -= on a bit field in most significant bits. * gcc.c-torture/execute/20040629-1.c: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=2.2326.2.399.2.26&r2=2.2326.2.399.2.27 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expr.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=1.615.4.11.2.2&r2=1.615.4.11.2.3 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/simplify-rtx.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=1.172.4.1.2.1&r2=1.172.4.1.2.2 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=1.3389.2.170.2.13&r2=1.3389.2.170.2.14 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20040629-1.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=NONE&r2=1.2.14.1 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20040705-1.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=NONE&r2=1.1.14.1 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20040705-2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=NONE&r2=1.1.14.1 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20040709-1.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=NONE&r2=1.1.12.1 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20040709-2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=NONE&r2=1.1.12.1 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15310 ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-10-31 4:02 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <bug-15310-4@http.gcc.gnu.org/bugzilla/> 2014-10-31 4:02 ` [Bug tree-optimization/15310] [tree-ssa] Optimize an addition in a bit field pinskia at gcc dot gnu.org 2004-05-06 8:37 [Bug optimization/15310] New: " kazu at cs dot umass dot edu 2004-05-16 11:29 ` [Bug tree-optimization/15310] " pinskia at gcc dot gnu dot org 2004-05-31 13:18 ` pinskia at gcc dot gnu dot org 2004-06-30 10:25 ` cvs-commit at gcc dot gnu dot org 2004-06-30 22:21 ` pinskia at gcc dot gnu dot org 2004-07-10 0:30 ` pinskia at gcc dot gnu dot org 2004-08-16 16:42 ` cvs-commit at gcc dot gnu dot org
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