================
@@ -4782,6 +4782,30 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl
GD, unsigned BuiltinID,
Function *F = CGM.getIntrinsic(Intrinsic::frameaddress, AllocaInt8PtrTy);
return RValue::get(Builder.CreateCall(F, Depth));
}
+ case Builtin::BI__builtin_stack_address: {
+ IntegerType *SPRegType;
+ StringRef SPRegName;
+ switch (getTarget().getTriple().getArch()) {
+ case Triple::x86:
+ SPRegType = Int32Ty;
+ SPRegName = "esp";
+ break;
+ case Triple::x86_64:
+ SPRegType = Int64Ty;
+ SPRegName = "rsp";
+ break;
+ default:
+ llvm_unreachable("Intrinsic __builtin_stack_address is not supported for
"
+ "the target architecture");
+ }
----------------
aalhwc wrote:
I updated the implementation to produce a compile error when the target
architecture is unsupported.
I reused the existing function
[`EmitSpecialRegisterBuiltin`](https://github.com/llvm/llvm-project/blob/2fae5bdea7c2016d4086aa7ecf3c5d0592ce95c8/clang/lib/CodeGen/CGBuiltin.cpp#L8929)
to generate the `@llvm.read_register` intrinsic. That required moving it
earlier in the source file.
I can make this a target-specific builtin if this implementation is not
appropriate.
https://github.com/llvm/llvm-project/pull/121332
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