[clang][CodeGen][PowerPC] Loading an _Atomic long double on ppc64le asserts in AtomicInfo::ConvertToValueOrAtomic (ppc_fp128 is not "IEEE-like") #239928

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1. YuanchengJiang

   added

   backend:PowerPC

   on Nov 7, 2026
2. YuanchengJiang

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   Bug

   issue type on Nov 7, 2026
3. YuanchengJiang

   added

   clang:codegenIR generation bugs: mangling, exceptions, etc.IR generation bugs: mangling, exceptions, etc.

   crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

   generated by fuzzerRegression test generated by fuzzing or AI analysis - not a real world code snippetRegression test generated by fuzzing or AI analysis - not a real world code snippet

   on Nov 7, 2026
4. llvmorg-github-actions commented on Nov 7, 2026

   

   llvmorg-github-actionsBot

   on Nov 7, 2026

   More actions

   @llvm/issue-subscribers-clang-codegen

   Author: Jiang Yuancheng (YuanchengJiang)

   Details

   The following code: ```c long double test(_Atomic long double *addr) { return *addr; } ```

   Resulted in this output:

   clang: /root/llvm-project/llvm/tools/clang/lib/CodeGen/CGAtomic.cpp:1574: clang::CodeGen::RValue {anonymous}::AtomicInfo::ConvertToValueOrAtomic(llvm::Value*, clang::CodeGen::AggValueSlot, clang::SourceLocation, bool, bool) const: Assertion `(Val->getType()->isIntegerTy() || Val->getType()->isPointerTy() || Val->getType()->isIEEELikeFPTy()) && "Expected integer, pointer or floating point value when converting " "result."' failed.
   

   Trunk reproducer (-emit-llvm --target=powerpc64le-unknown-linux-gnu): https://godbolt.org/z/EKxz7rT4e
5. llvmorg-github-actions commented on Nov 7, 2026

   

   llvmorg-github-actionsBot

   on Nov 7, 2026

   More actions

   @llvm/issue-subscribers-backend-powerpc

   Author: Jiang Yuancheng (YuanchengJiang)

   Details

   The following code: ```c long double test(_Atomic long double *addr) { return *addr; } ```

   Resulted in this output:

   clang: /root/llvm-project/llvm/tools/clang/lib/CodeGen/CGAtomic.cpp:1574: clang::CodeGen::RValue {anonymous}::AtomicInfo::ConvertToValueOrAtomic(llvm::Value*, clang::CodeGen::AggValueSlot, clang::SourceLocation, bool, bool) const: Assertion `(Val->getType()->isIntegerTy() || Val->getType()->isPointerTy() || Val->getType()->isIEEELikeFPTy()) && "Expected integer, pointer or floating point value when converting " "result."' failed.
   

   Trunk reproducer (-emit-llvm --target=powerpc64le-unknown-linux-gnu): https://godbolt.org/z/EKxz7rT4e