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CodeGen: add __readfsdword builtin 

The Windows NT SDK uses __readfsdword and declares it as a compiler provided
builtin (#pragma intrinsic(__readfsword).  Because intrin.h is not referenced
by winnt.h, it is not possible to provide an out-of-line definition for the
intrinsic.  Provide a proper compiler builtin definition.

llvm-svn: 220859
This commit is contained in:
Saleem Abdulrasool 2014-10-29 16:35:41 +00:00
parent 595e598869
commit a25fbef088
4 changed files with 23 additions and 5 deletions
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1
clang/include/clang/Basic/Builtins.def
View File

@ -703,6 +703,7 @@ LANGBUILTIN(_InterlockedDecrement, "LiLiD*", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(_InterlockedExchangeAdd, "LiLiD*Li", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(_InterlockedExchangePointer, "v*v*D*v*", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(_InterlockedExchange, "LiLiD*Li", "n", ALL_MS_LANGUAGES)
LANGBUILTIN(__readfsdword, "ULiULi", "n", ALL_MS_LANGUAGES)
// C99 library functions
// C99 stdlib.h

8
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -1624,6 +1624,14 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
RMWI->setVolatile(true);
return RValue::get(RMWI);
}
case Builtin::BI__readfsdword: {
Value *IntToPtr =
Builder.CreateIntToPtr(EmitScalarExpr(E->getArg(0)),
llvm::PointerType::get(CGM.Int32Ty, 257));
LoadInst *Load =
Builder.CreateAlignedLoad(IntToPtr, /*Align=*/4, /*isVolatile=*/true);
return RValue::get(Load);
}
}
// If this is an alias for a lib function (e.g. __builtin_sin), emit

4
clang/lib/Headers/Intrin.h
View File

@ -861,10 +861,6 @@ static __inline__ unsigned char __attribute__((__always_inline__, __nodebug__))
__readfsbyte(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned char, __offset);
}
static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
__readfsdword(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned long, __offset);
}
static __inline__ unsigned __int64 __attribute__((__always_inline__, __nodebug__))
__readfsqword(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned __int64, __offset);

15
clang/test/CodeGen/ms-intrinsics.c
View File

@ -1,4 +1,4 @@
// RUN: %clang_cc1 -triple i686--windows -fms-compatibility -Oz -emit-llvm %s -o - | FileCheck %s
// RUN: %clang_cc1 -triple i686--windows -fms-compatibility -Oz -emit-llvm %s -o - | FileCheck %s -check-prefix CHECK -check-prefix CHECK-I386
// RUN: %clang_cc1 -triple thumbv7--windows -fms-compatibility -Oz -emit-llvm %s -o - | FileCheck %s
void *test_InterlockedExchangePointer(void * volatile *Target, void *Value) {
@ -36,3 +36,16 @@ long test_InterlockedExchange(long *Target, long Value) {
// CHECK: %[[EXCHANGE:[0-9]+]] = atomicrmw xchg i32* %Target, i32 %Value seq_cst
// CHECK: ret i32 %[[EXCHANGE:[0-9]+]]
// CHECK: }
#if defined(__i386__)
long test__readfsdword(unsigned long Offset) {
return __readfsdword(Offset);
}
// CHECK-I386: define i32 @test__readfsdword(i32 %Offset){{.*}}{
// CHECK-I386: %0 = inttoptr i32 %Offset to i32 addrspace(257)*
// CHECK-I386: %1 = load volatile i32 addrspace(257)* %0, align 4
// CHECK-I386: ret i32 %1
// CHECK-I386: }
#endif