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

[Martin Storsjö via llvm-commits]

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

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))
          |

>From 0af0e66767524a1693b1ab4684a6727e0a9f0985 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin at martin.st>
Date: Wed, 17 Sep 2025 14:33:46 +0300
Subject: [PATCH] [AArch64] Avoid warning about comparison of different
 signedness. NFC.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

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))
          |
---
 llvm/lib/Target/AArch64/AArch64ISelLowering.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
     }