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Implement MS read/write barriers and __faststorefence intrinsic 

Reviewers: hans, rnk, majnemer

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D25442

llvm-svn: 283793
This commit is contained in:
Albert Gutowski 2016-10-10 19:40:51 +00:00
parent f9ff04c56a
commit fcea61c563
5 changed files with 66 additions and 30 deletions
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4
clang/include/clang/Basic/BuiltinsX86.def
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@ -2071,6 +2071,10 @@ TARGET_BUILTIN(__builtin_ia32_selectpd_512, "V8dUcV8dV8d", "", "")
TARGET_BUILTIN(__builtin_ia32_monitorx, "vv*UiUi", "", "mwaitx")
TARGET_BUILTIN(__builtin_ia32_mwaitx, "vUiUiUi", "", "mwaitx")
TARGET_HEADER_BUILTIN(_ReadWriteBarrier, "v", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(_ReadBarrier, "v", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(_WriteBarrier, "v", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(__emul, "LLiii", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(__emulu, "ULLiUiUi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")

3
clang/include/clang/Basic/BuiltinsX86_64.def
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@ -23,5 +23,8 @@ TARGET_HEADER_BUILTIN(__umulh, "ULLiULLiULLi", "nch", "intrin.h", ALL_MS_LANGUAG
TARGET_HEADER_BUILTIN(_mul128, "LLiLLiLLiLLi*", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(_umul128, "ULLiULLiULLiULLi*", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(__faststorefence, "v", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
#undef BUILTIN
#undef TARGET_HEADER_BUILTIN

11
clang/lib/CodeGen/CGBuiltin.cpp
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@ -7612,6 +7612,17 @@ Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
Builder.CreateStore(HigherBits, HighBitsAddress);
return Builder.CreateIntCast(MulResult, ResType, IsSigned);
}
case X86::BI__faststorefence: {
return Builder.CreateFence(llvm::AtomicOrdering::SequentiallyConsistent,
llvm::CrossThread);
}
case X86::BI_ReadWriteBarrier:
case X86::BI_ReadBarrier:
case X86::BI_WriteBarrier: {
return Builder.CreateFence(llvm::AtomicOrdering::SequentiallyConsistent,
llvm::SingleThread);
}
}
}

39
clang/lib/Headers/intrin.h
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@ -256,10 +256,12 @@ static __inline__
unsigned long __cdecl _lrotl(unsigned long, int);
static __inline__
unsigned long __cdecl _lrotr(unsigned long, int);
static __inline__
void _ReadBarrier(void);
static __inline__
void _ReadWriteBarrier(void);
static __inline__ void
__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
_ReadBarrier(void);
static __inline__ void
__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
_ReadWriteBarrier(void);
static __inline__
void *_ReturnAddress(void);
unsigned int _rorx_u32(unsigned int, const unsigned int);
@ -288,8 +290,9 @@ unsigned int _shrx_u32(unsigned int, unsigned int);
void _Store_HLERelease(long volatile *, long);
void _Store64_HLERelease(__int64 volatile *, __int64);
void _StorePointer_HLERelease(void *volatile *, void *);
static __inline__
void _WriteBarrier(void);
static __inline__ void
__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
_WriteBarrier(void);
unsigned __int32 xbegin(void);
void _xend(void);
static __inline__
@ -1045,30 +1048,6 @@ _InterlockedCompareExchange64_rel(__int64 volatile *_Destination,
}
#endif
/*----------------------------------------------------------------------------*\
|* Barriers
\*----------------------------------------------------------------------------*/
static __inline__ void __DEFAULT_FN_ATTRS
__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
_ReadWriteBarrier(void) {
__atomic_signal_fence(__ATOMIC_SEQ_CST);
}
static __inline__ void __DEFAULT_FN_ATTRS
__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
_ReadBarrier(void) {
__atomic_signal_fence(__ATOMIC_SEQ_CST);
}
static __inline__ void __DEFAULT_FN_ATTRS
__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
_WriteBarrier(void) {
__atomic_signal_fence(__ATOMIC_SEQ_CST);
}
#ifdef __x86_64__
static __inline__ void __DEFAULT_FN_ATTRS
__faststorefence(void) {
__atomic_thread_fence(__ATOMIC_SEQ_CST);
}
#endif
/*----------------------------------------------------------------------------*\
|* readfs, readgs
|* (Pointers in address space #256 and #257 are relative to the GS and FS
|* segment registers, respectively.)

39
clang/test/CodeGen/ms-barriers-intrinsics.c Normal file
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@ -0,0 +1,39 @@
// RUN: %clang_cc1 -ffreestanding -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 \
// RUN: -triple i686--windows -emit-llvm %s -o - \
// RUN: | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-I386
// RUN: %clang_cc1 -ffreestanding -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 \
// RUN: -triple x86_64--windows -emit-llvm %s -o - \
// RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-X64
// intrin.h needs size_t, but -ffreestanding prevents us from getting it from
// stddef.h. Work around it with this typedef.
typedef __SIZE_TYPE__ size_t;
#include <intrin.h>
void test_ReadWriteBarrier() { _ReadWriteBarrier(); }
// CHECK-LABEL: define void @test_ReadWriteBarrier
// CHECK: fence singlethread seq_cst
// CHECK: ret void
// CHECK: }
void test_ReadBarrier() { _ReadBarrier(); }
// CHECK-LABEL: define void @test_ReadBarrier
// CHECK: fence singlethread seq_cst
// CHECK: ret void
// CHECK: }
void test_WriteBarrier() { _WriteBarrier(); }
// CHECK-LABEL: define void @test_WriteBarrier
// CHECK: fence singlethread seq_cst
// CHECK: ret void
// CHECK: }
#if defined(__x86_64__)
void test__faststorefence() { __faststorefence(); }
// CHECK-X64-LABEL: define void @test__faststorefence
// CHECK-X64: fence seq_cst
// CHECK-X64: ret void
// CHECK-X64: }
#endif