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* [Bug c/107316] New: [aarch64] Init big const value should be improved compare to llvm
@ 2022-10-19 11:26 zhongyunde at huawei dot com
2022-10-19 16:15 ` [Bug target/107316] " pinskia at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: zhongyunde at huawei dot com @ 2022-10-19 11:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107316
Bug ID: 107316
Summary: [aarch64] Init big const value should be improved
compare to llvm
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: zhongyunde at huawei dot com
Target Milestone: ---
test case: https://godbolt.org/z/ahreYnahE
```
int main (int argc, char** argv)
{
if (lshift_1 (0xaaaa5555aaaa5555ull) != 0ll)
abort();
return 0;
}
```
* gcc use 4 instructions
```
mov x0, 21845
movk x0, 0xaaaa, lsl 16
movk x0, 0x5555, lsl 32
movk x0, 0xaaaa, lsl 48
```
* while llvm use 3 instructions:
```
mov x0, #6148914691236517205
movk x0, #43690, lsl #16
movk x0, #43690, lsl #48
```
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug target/107316] [aarch64] Init big const value should be improved compare to llvm 2022-10-19 11:26 [Bug c/107316] New: [aarch64] Init big const value should be improved compare to llvm zhongyunde at huawei dot com @ 2022-10-19 16:15 ` pinskia at gcc dot gnu.org 2022-10-23 5:55 ` zhongyunde at huawei dot com ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-10-19 16:15 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107316 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2022-10-19 Ever confirmed|0 |1 Status|UNCONFIRMED |NEW --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I suspect this is just a dup of bug 106583 and will be fixed by the patch which was submitted recently (https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603905.html). ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/107316] [aarch64] Init big const value should be improved compare to llvm 2022-10-19 11:26 [Bug c/107316] New: [aarch64] Init big const value should be improved compare to llvm zhongyunde at huawei dot com 2022-10-19 16:15 ` [Bug target/107316] " pinskia at gcc dot gnu.org @ 2022-10-23 5:55 ` zhongyunde at huawei dot com 2022-10-25 12:05 ` wilco at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: zhongyunde at huawei dot com @ 2022-10-23 5:55 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107316 --- Comment #2 from vfdff <zhongyunde at huawei dot com> --- (In reply to Andrew Pinski from comment #1) > I suspect this is just a dup of bug 106583 and will be fixed by the patch > which was submitted recently > (https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603905.html). Thanks very much, I'll check that after the patch will be committed to the upstream. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/107316] [aarch64] Init big const value should be improved compare to llvm 2022-10-19 11:26 [Bug c/107316] New: [aarch64] Init big const value should be improved compare to llvm zhongyunde at huawei dot com 2022-10-19 16:15 ` [Bug target/107316] " pinskia at gcc dot gnu.org 2022-10-23 5:55 ` zhongyunde at huawei dot com @ 2022-10-25 12:05 ` wilco at gcc dot gnu.org 2022-10-25 12:14 ` wilco at gcc dot gnu.org 2022-11-28 22:42 ` pinskia at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: wilco at gcc dot gnu.org @ 2022-10-25 12:05 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107316 Bug 107316 depends on bug 106583, which changed state. Bug 106583 Summary: Suboptimal immediate generation on aarch64 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106583 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/107316] [aarch64] Init big const value should be improved compare to llvm 2022-10-19 11:26 [Bug c/107316] New: [aarch64] Init big const value should be improved compare to llvm zhongyunde at huawei dot com ` (2 preceding siblings ...) 2022-10-25 12:05 ` wilco at gcc dot gnu.org @ 2022-10-25 12:14 ` wilco at gcc dot gnu.org 2022-11-28 22:42 ` pinskia at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: wilco at gcc dot gnu.org @ 2022-10-25 12:14 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107316 Wilco <wilco at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |wilco at gcc dot gnu.org Resolution|--- |FIXED --- Comment #3 from Wilco <wilco at gcc dot gnu.org> --- As Andrew says, it's a duplicate so fixed now. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/107316] [aarch64] Init big const value should be improved compare to llvm 2022-10-19 11:26 [Bug c/107316] New: [aarch64] Init big const value should be improved compare to llvm zhongyunde at huawei dot com ` (3 preceding siblings ...) 2022-10-25 12:14 ` wilco at gcc dot gnu.org @ 2022-11-28 22:42 ` pinskia at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-11-28 22:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107316 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |13.0 ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-11-28 22:42 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-10-19 11:26 [Bug c/107316] New: [aarch64] Init big const value should be improved compare to llvm zhongyunde at huawei dot com 2022-10-19 16:15 ` [Bug target/107316] " pinskia at gcc dot gnu.org 2022-10-23 5:55 ` zhongyunde at huawei dot com 2022-10-25 12:05 ` wilco at gcc dot gnu.org 2022-10-25 12:14 ` wilco at gcc dot gnu.org 2022-11-28 22:42 ` pinskia at gcc dot gnu.org
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