[X86] Allow _mm_prefetch (both the header implementation and the builtin) to accept bit 2 which is supposed to indicate the prefetched addresses will be written to
Add the appropriate _MM_HINT_ET0/ET1 defines to match gcc.
llvm-svn: 321325
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 4294a57..609987c 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -8022,8 +8022,9 @@
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});