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[CIR][CodeGen] Support for _mm_prefetch #1560

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[CIR][CodeGen] Support for _mm_prefetch #1560

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2 changes: 2 additions & 0 deletions clang/include/clang/CIR/Dialect/IR/CIROps.td
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Original file line number Diff line number Diff line change
Expand Up @@ -5304,6 +5304,8 @@ def PrefetchOp : CIR_Op<"prefetch"> {
IntMaxValue<3>]>:$locality,
UnitAttr:$isWrite);

let results = (outs VoidPtr:$result);

let assemblyFormat = [{
`(` $addr `:` qualified(type($addr)) `)`
`locality``(` $locality `)`
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16 changes: 15 additions & 1 deletion clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
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Expand Up @@ -95,7 +95,21 @@ mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned BuiltinID,
default:
return nullptr;
case X86::BI_mm_prefetch: {
llvm_unreachable("_mm_prefetch NYI");
mlir::Location loc = getLoc(E->getExprLoc());
auto C = dyn_cast<cir::IntAttr>(
cast<cir::ConstantOp>(Ops[1].getDefiningOp()).getValue());
auto Locality = mlir::IntegerAttr::get(
mlir::IntegerType::get(builder.getContext(), 32), C.getUInt() & 0x3);
bool ReadWrite = ((C.getUInt() >> 2) & 0x1) == 1;
mlir::UnitAttr isWrite =
ReadWrite ? mlir::UnitAttr::get(&getMLIRContext()) : nullptr;
mlir::Type voidPtrType =
cir::PointerType::get(cir::VoidType::get(&getMLIRContext()));
auto CastToVoid = builder.create<cir::CastOp>(
loc, voidPtrType, cir::CastKind::bitcast, Ops[0]);
auto res =
builder.create<cir::PrefetchOp>(loc, CastToVoid, Locality, isWrite);
return res->getResult(0);
}
case X86::BI_mm_clflush: {
mlir::Type voidTy = cir::VoidType::get(&getMLIRContext());
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8 changes: 8 additions & 0 deletions clang/test/CIR/CodeGen/X86/builtins-x86.c
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Expand Up @@ -6,6 +6,14 @@
// This test mimics clang/test/CodeGen/builtins-x86.c, which eventually
// CIR shall be able to support fully.

void test_mm_prefetch(char const* p) {
// CIR-LABEL: test_mm_prefetch
// LLVM-LABEL: test_mm_prefetch
_mm_prefetch(p,0);
//CIR: {{%.*}}= cir.prefetch({{%.*}} : !cir.ptr<!void>) locality(0) read
// LLVM: call void @llvm.prefetch.p0(ptr {{.*}}, i32 0, i32 0, i32 1)
}

void test_mm_clflush(const void* tmp_vCp) {
// CIR-LABEL: test_mm_clflush
// LLVM-LABEL: test_mm_clflush
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