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
```
