[X86] Implement __readgsqword (and the rest) as builtins (PR32373)
It seems MS headers have started using __readgsqword, and since it's
used in a header that doesn't include intrin.h, we can't implement it as
an inline function anymore.
That was already the case for __readfsdword, which Saleem added support
for in r220859. This patch reuses that codegen to implement all of
__read[fg]s{byte,word,dword,qword}.
Differential Revision: https://reviews.llvm.org/D31248
llvm-svn: 298538
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 8175890..463dda4 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -2238,16 +2238,6 @@
case Builtin::BI_InterlockedXor16:
case Builtin::BI_InterlockedXor:
return RValue::get(EmitMSVCBuiltinExpr(MSVCIntrin::_InterlockedXor, E));
- case Builtin::BI__readfsdword: {
- llvm::Type *IntTy = ConvertType(E->getType());
- Value *IntToPtr =
- Builder.CreateIntToPtr(EmitScalarExpr(E->getArg(0)),
- llvm::PointerType::get(IntTy, 257));
- LoadInst *Load = Builder.CreateAlignedLoad(
- IntTy, IntToPtr, getContext().getTypeAlignInChars(E->getType()));
- Load->setVolatile(true);
- return RValue::get(Load);
- }
case Builtin::BI__exception_code:
case Builtin::BI_exception_code:
@@ -8005,6 +7995,30 @@
CS.setAttributes(NoReturnAttr);
return CS.getInstruction();
}
+ case X86::BI__readfsbyte:
+ case X86::BI__readfsword:
+ case X86::BI__readfsdword:
+ case X86::BI__readfsqword: {
+ llvm::Type *IntTy = ConvertType(E->getType());
+ Value *Ptr = Builder.CreateIntToPtr(EmitScalarExpr(E->getArg(0)),
+ llvm::PointerType::get(IntTy, 257));
+ LoadInst *Load = Builder.CreateAlignedLoad(
+ IntTy, Ptr, getContext().getTypeAlignInChars(E->getType()));
+ Load->setVolatile(true);
+ return Load;
+ }
+ case X86::BI__readgsbyte:
+ case X86::BI__readgsword:
+ case X86::BI__readgsdword:
+ case X86::BI__readgsqword: {
+ llvm::Type *IntTy = ConvertType(E->getType());
+ Value *Ptr = Builder.CreateIntToPtr(EmitScalarExpr(E->getArg(0)),
+ llvm::PointerType::get(IntTy, 256));
+ LoadInst *Load = Builder.CreateAlignedLoad(
+ IntTy, Ptr, getContext().getTypeAlignInChars(E->getType()));
+ Load->setVolatile(true);
+ return Load;
+ }
}
}