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[clang][CodeGen] __atomic_always_lock_free with a non-constant size asserts on ARM (HasExtraArg) and RISC-V ("unexpected builtin ID") #239930
Description
The following code:
void f(unsigned long size, void *ptr) { __atomic_always_lock_free(size, ptr); }
Resulted in this output:
clang: /root/llvm-project/llvm/tools/clang/lib/CodeGen/TargetBuiltins/ARM.cpp:2702: llvm::Value* clang::CodeGen::CodeGenFunction::EmitARMBuiltinExpr(unsigned int, const clang::CallExpr*, clang::CodeGen::ReturnValueSlot, llvm::Triple::ArchType): Assertion `HasExtraArg' failed.
Trunk reproducer (--target=armv7-none-eabi): https://godbolt.org/z/nacd531az
Activity
llvmorg-github-actions commentedon Nov 7, 2026
@llvm/issue-subscribers-clang-codegen
Author: Jiang Yuancheng (YuanchengJiang)
Details
The following code: ```c void f(unsigned long size, void *ptr) { __atomic_always_lock_free(size, ptr); } ```Resulted in this output:
Trunk reproducer (
--target=armv7-none-eabi): https://godbolt.org/z/nacd531azllvmorg-github-actions commentedon Nov 7, 2026
@llvm/issue-subscribers-backend-arm
Author: Jiang Yuancheng (YuanchengJiang)
Details
The following code: ```c void f(unsigned long size, void *ptr) { __atomic_always_lock_free(size, ptr); } ```Resulted in this output:
Trunk reproducer (
--target=armv7-none-eabi): https://godbolt.org/z/nacd531az