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[MSVC, ARM64] Add __prefetch intrinsic #67174

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Oct 13, 2023
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[MSVC, ARM64] Add __prefetch intrinsic #67174

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2 changes: 2 additions & 0 deletions clang/include/clang/Basic/BuiltinsAArch64.def
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Expand Up @@ -283,6 +283,8 @@ TARGET_HEADER_BUILTIN(_CountLeadingZeros64, "UiULLi", "nh", INTRIN_H, ALL_MS_LAN
TARGET_HEADER_BUILTIN(_CountOneBits, "UiUNi", "nh", INTRIN_H, ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(_CountOneBits64, "UiULLi", "nh", INTRIN_H, ALL_MS_LANGUAGES, "")

TARGET_HEADER_BUILTIN(__prefetch, "vv*", "nh", INTRIN_H, ALL_MS_LANGUAGES, "")

#undef BUILTIN
#undef LANGBUILTIN
#undef TARGET_BUILTIN
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9 changes: 9 additions & 0 deletions clang/lib/CodeGen/CGBuiltin.cpp
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Expand Up @@ -10834,6 +10834,15 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
return Result;
}

if (BuiltinID == AArch64::BI__prefetch) {
Value *Address = EmitScalarExpr(E->getArg(0));
Value *RW = llvm::ConstantInt::get(Int32Ty, 0);
Value *Locality = ConstantInt::get(Int32Ty, 3);
Value *Data = llvm::ConstantInt::get(Int32Ty, 1);
Function *F = CGM.getIntrinsic(Intrinsic::prefetch, Address->getType());
return Builder.CreateCall(F, {Address, RW, Locality, Data});
}

// Handle MSVC intrinsics before argument evaluation to prevent double
// evaluation.
if (std::optional<MSVCIntrin> MsvcIntId =
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2 changes: 2 additions & 0 deletions clang/lib/Headers/intrin.h
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Expand Up @@ -586,6 +586,8 @@ unsigned int _CountLeadingZeros(unsigned long);
unsigned int _CountLeadingZeros64(unsigned _int64);
unsigned int _CountOneBits(unsigned long);
unsigned int _CountOneBits64(unsigned __int64);

void __cdecl __prefetch(void *);
#endif

/*----------------------------------------------------------------------------*\
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10 changes: 10 additions & 0 deletions clang/test/CodeGen/arm64-microsoft-intrinsics.c
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Expand Up @@ -402,6 +402,16 @@ unsigned int check_CountOneBits64(unsigned __int64 arg1) {
// CHECK-MSCOMPAT: ret i32 %[[VAR2]]
// CHECK-LINUX: error: call to undeclared function '_CountOneBits64'

void check__prefetch(void *arg1) {
return __prefetch(arg1);
}

// CHECK-MSCOMPAT: %[[ARG1:.*]].addr = alloca ptr, align 8
// CHECK-MSCOMPAT: store ptr %[[ARG1]], ptr %[[ARG1]].addr, align 8
// CHECK-MSCOMPAT: %[[VAR0:.*]] = load ptr, ptr %[[ARG1]].addr, align 8
// CHECK-MSCOMPAT: call void @llvm.prefetch.p0(ptr %[[VAR0]], i32 0, i32 3, i32 1)
// CHECK-MSCOMPAT: ret void


// CHECK-MSCOMPAT: ![[MD2]] = !{!"x18"}
// CHECK-MSCOMPAT: ![[MD3]] = !{!"sp"}