[llvm] [Hexagon] Implement shouldConvertConstantLoadToIntImm (PR #146452)

[via llvm-commits]

fossdd wrote:

Hi, this commit currently leads to a test fail with 21-rc1 and -rc2 on Alpine Linux edge on all architectures:

```
FAIL: LLVM :: CodeGen/Hexagon/hexagon-strcpy.ll (13273 of 59975)
******************** TEST 'LLVM :: CodeGen/Hexagon/hexagon-strcpy.ll' FAILED ********************
Exit Code: 1
Command Output (stderr):
--
/builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/build/bin/llc -march=hexagon -verify-machineinstrs  < /builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/llvm/test/CodeGen/Hexagon/hexagon-strcpy.ll | /builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/build/bin/FileCheck /builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/llvm/test/CodeGen/Hexagon/hexagon-strcpy.ll # RUN: at line 2
+ /builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/build/bin/llc -march=hexagon -verify-machineinstrs
+ /builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/build/bin/FileCheck /builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/llvm/test/CodeGen/Hexagon/hexagon-strcpy.ll
/builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/llvm/test/CodeGen/Hexagon/hexagon-strcpy.ll:15:15: error: CHECK-NEXT: is not on the line after the previous match
; CHECK-NEXT: .cfi_def_cfa r30, 8
              ^
<stdin>:16:2: note: 'next' match was here
 .cfi_def_cfa r30, 8
 ^
<stdin>:10:20: note: previous match ended here
// %bb.0: // %entry
                   ^
<stdin>:11:1: note: non-matching line after previous match is here
 {
^
Input file: <stdin>
Check file: /builds/alpine/aports/testing/llvm21/src/llvm-project-21.1.0-rc1.src/llvm/test/CodeGen/Hexagon/hexagon-strcpy.ll
-dump-input=help explains the following input dump.
Input was:
<<<<<<
         .
         .
         .
        11:  { 
        12:  r0 = ##.L.str1 
        13:  r3:2 = CONST64(#2325073635944967245) 
        14:  allocframe(r29,#32):raw 
        15:  } 
        16:  .cfi_def_cfa r30, 8 
next:15      !~~~~~~~~~~~~~~~~~~  error: match on wrong line
        17:  .cfi_offset r31, -4 
        18:  .cfi_offset r30, -8 
        19:  { 
        20:  r1 = add(r29,#0) 
        21:  r5:4 = CONST64(#4706902966564560965) 
         .
         .
         .
>>>>>>
```

Do you understand whats going on here?

https://github.com/llvm/llvm-project/pull/146452