[Bug rtl-optimization/116398] New: [15 Regression] gcc.target/aarch64/ashltidisi.c fails

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116398

            Bug ID: 116398
           Summary: [15 Regression] gcc.target/aarch64/ashltidisi.c fails
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

FAIL: gcc.target/aarch64/ashltidisi.c scan-assembler-times asr 3

Extracted testcase:
```
__int128_t __attribute__((noinline)) shift_53_i(int data) {
    return (__int128_t)data << 53;
}
```

14 produced:
```
        mov     w1, w0
        lsl     x0, x1, 53
        sbfx    x1, x1, 11, 21
        ret
```

While 15 produces:
```
        sxtw    x1, w0
        lsl     x0, x1, 53
        asr     x1, x1, 11
        ret
```