[clang] [clang] fix emitvaarg when struct is null (PR #72624)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-codegen

Author: Jolyon (Jolyon0202)

<details>
<summary>Changes</summary>

Fix bug when emit null struct with attribute aligned(16) and ICE of debugbuild.

---
Full diff: https://github.com/llvm/llvm-project/pull/72624.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/Targets/AArch64.cpp (+2-2) 


``````````diff
diff --git a/clang/lib/CodeGen/Targets/AArch64.cpp b/clang/lib/CodeGen/Targets/AArch64.cpp
index be5145daa00b7f5..49dff102b7d554a 100644
--- a/clang/lib/CodeGen/Targets/AArch64.cpp
+++ b/clang/lib/CodeGen/Targets/AArch64.cpp
@@ -526,7 +526,7 @@ Address AArch64ABIInfo::EmitAAPCSVAArg(Address VAListAddr, QualType Ty,
   llvm::Type *BaseTy = CGF.ConvertType(Ty);
   if (IsIndirect)
     BaseTy = llvm::PointerType::getUnqual(BaseTy);
-  else if (AI.getCoerceToType())
+  else if (AI.canHaveCoerceToType() && AI.getCoerceToType())
     BaseTy = AI.getCoerceToType();
 
   unsigned NumRegs = 1;
@@ -594,7 +594,7 @@ Address AArch64ABIInfo::EmitAAPCSVAArg(Address VAListAddr, QualType Ty,
   // Integer arguments may need to correct register alignment (for example a
   // "struct { __int128 a; };" gets passed in x_2N, x_{2N+1}). In this case we
   // align __gr_offs to calculate the potential address.
-  if (!IsFPR && !IsIndirect && TyAlign.getQuantity() > 8) {
+  if (!IsFPR && !IsIndirect && TyAlign.getQuantity() > 8 && !TySize.isZero()) {
     int Align = TyAlign.getQuantity();
 
     reg_offs = CGF.Builder.CreateAdd(

``````````

</details>


https://github.com/llvm/llvm-project/pull/72624