[llvm] [AArch64] Avoid warning about comparison of different signedness. NFC. (PR #159337)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-aarch64

Author: Martin Storsjö (mstorsjo)

<details>
<summary>Changes</summary>

This fixes the following warning when compiled with GCC:

    ../lib/Target/AArch64/AArch64ISelLowering.cpp: In function ‘bool shouldLowerTailCallStackArg(const llvm::MachineFunction&, const llvm::CCValAssign&, llvm::SDValue, llvm::ISD::ArgFlagsTy, int)’:
    ../lib/Target/AArch64/AArch64ISelLowering.cpp:9310: warning: comparison of integer expressions of different signedness: ‘uint64_t’ {aka ‘long unsigned int’} and ‘int64_t’ {aka ‘long int’} [-Wsign-compare]
     9310 |       if (SizeInBits / 8 != MFI.getObjectSize(FI))
          |

---
Full diff: https://github.com/llvm/llvm-project/pull/159337.diff


1 Files Affected:

- (modified) llvm/lib/Target/AArch64/AArch64ISelLowering.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index f6389aad96bf8..4af0d2f089c23 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -9307,7 +9307,7 @@ static bool shouldLowerTailCallStackArg(const MachineFunction &MF,
       if (CallOffset != MFI.getObjectOffset(FI))
         return true;
       uint64_t SizeInBits = LoadNode->getMemoryVT().getFixedSizeInBits();
-      if (SizeInBits / 8 != MFI.getObjectSize(FI))
+      if (SizeInBits / 8 != static_cast<uint64_t>(MFI.getObjectSize(FI)))
         return true;
       return false;
     }

``````````

</details>


https://github.com/llvm/llvm-project/pull/159337