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From: "zhongyunde at huawei dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/107316] New: [aarch64] Init big const value should be
 improved compare to llvm
Date: Wed, 19 Oct 2022 11:26:27 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 13.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: zhongyunde at huawei dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107316

            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) !=3D 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
```=