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-rw-r--r--clang/lib/CodeGen/CGBuiltin.cpp5
1 files changed, 3 insertions, 2 deletions
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 4294a579def..609987c4fa4 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -8022,8 +8022,9 @@ Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
default: return nullptr;
case X86::BI_mm_prefetch: {
Value *Address = Ops[0];
- Value *RW = ConstantInt::get(Int32Ty, 0);
- Value *Locality = Ops[1];
+ ConstantInt *C = cast<ConstantInt>(Ops[1]);
+ Value *RW = ConstantInt::get(Int32Ty, (C->getZExtValue() >> 2) & 0x1);
+ Value *Locality = ConstantInt::get(Int32Ty, C->getZExtValue() & 0x3);
Value *Data = ConstantInt::get(Int32Ty, 1);
Value *F = CGM.getIntrinsic(Intrinsic::prefetch);
return Builder.CreateCall(F, {Address, RW, Locality, Data});
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