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AArch64: Add support for instruction prefetch intrinsic

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Instruction prefetch is not implemented for AArch64, it is incorrectly
translated into data prefetch instruction.

Differential Revision: http://reviews.llvm.org/D4777


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214860 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Yi Kong 2014-08-05 12:46:47 +00:00
parent 72035e9a8e
commit 68b3d680f2
2 changed files with 47 additions and 12 deletions
lib/Target/AArch64
AArch64ISelLowering.cpp
test/CodeGen/AArch64
arm64-prefetch.ll

4
lib/Target/AArch64/AArch64ISelLowering.cpp

@ -1334,8 +1334,7 @@ static SDValue LowerPREFETCH(SDValue Op, SelectionDAG &DAG) {
SDLoc DL(Op);
unsigned IsWrite = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
unsigned Locality = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue();
// The data thing is not used.
// unsigned isData = cast<ConstantSDNode>(Op.getOperand(4))->getZExtValue();
unsigned IsData = cast<ConstantSDNode>(Op.getOperand(4))->getZExtValue();
bool IsStream = !Locality;
// When the locality number is set
@ -1350,6 +1349,7 @@ static SDValue LowerPREFETCH(SDValue Op, SelectionDAG &DAG) {
// built the mask value encoding the expected behavior.
unsigned PrfOp = (IsWrite << 4) | // Load/Store bit
(!IsData << 3) | // IsDataCache bit
(Locality << 1) | // Cache level bits
(unsigned)IsStream; // Stream bit
return DAG.getNode(AArch64ISD::PREFETCH, DL, MVT::Other, Op.getOperand(0),

55
test/CodeGen/AArch64/arm64-prefetch.ll

@ -17,6 +17,15 @@ entry:
; CHECK: prfum pldl1keep
call void @llvm.prefetch(i8* %tmp, i32 0, i32 3, i32 1)
; CHECK: prfum plil1strm
call void @llvm.prefetch(i8* %tmp, i32 0, i32 0, i32 0)
; CHECK: prfum plil3keep
call void @llvm.prefetch(i8* %tmp, i32 0, i32 1, i32 0)
; CHECK: prfum plil2keep
call void @llvm.prefetch(i8* %tmp, i32 0, i32 2, i32 0)
; CHECK: prfum plil1keep
call void @llvm.prefetch(i8* %tmp, i32 0, i32 3, i32 0)
; CHECK: prfum pstl1strm
call void @llvm.prefetch(i8* %tmp, i32 1, i32 0, i32 1)
; CHECK: prfum pstl3keep
@ -57,26 +66,52 @@ entry:
%arrayidx12 = getelementptr inbounds i32* %tmp10, i64 %idxprom
%tmp11 = bitcast i32* %arrayidx12 to i8*
; CHECK: prfm pstl1strm
call void @llvm.prefetch(i8* %tmp11, i32 1, i32 0, i32 1)
; CHECK: prfm plil1strm
call void @llvm.prefetch(i8* %tmp11, i32 0, i32 0, i32 0)
%tmp12 = load i32** @a, align 8, !tbaa !3
%arrayidx15 = getelementptr inbounds i32* %tmp12, i64 %idxprom
%tmp13 = bitcast i32* %arrayidx15 to i8*
%tmp13 = bitcast i32* %arrayidx3 to i8*
; CHECK: prfm pstl3keep
call void @llvm.prefetch(i8* %tmp13, i32 1, i32 1, i32 1)
; CHECK: prfm plil3keep
call void @llvm.prefetch(i8* %tmp13, i32 0, i32 1, i32 0)
%tmp14 = load i32** @a, align 8, !tbaa !3
%arrayidx18 = getelementptr inbounds i32* %tmp14, i64 %idxprom
%tmp15 = bitcast i32* %arrayidx18 to i8*
%tmp15 = bitcast i32* %arrayidx6 to i8*
; CHECK: prfm pstl2keep
call void @llvm.prefetch(i8* %tmp15, i32 1, i32 2, i32 1)
; CHECK: prfm plil2keep
call void @llvm.prefetch(i8* %tmp15, i32 0, i32 2, i32 0)
%tmp16 = load i32** @a, align 8, !tbaa !3
%arrayidx21 = getelementptr inbounds i32* %tmp16, i64 %idxprom
%tmp17 = bitcast i32* %arrayidx21 to i8*
%tmp17 = bitcast i32* %arrayidx9 to i8*
; CHECK: prfm plil1keep
call void @llvm.prefetch(i8* %tmp17, i32 0, i32 3, i32 0)
%tmp18 = load i32** @a, align 8, !tbaa !3
%arrayidx24 = getelementptr inbounds i32* %tmp18, i64 %idxprom
%tmp19 = bitcast i32* %arrayidx12 to i8*
; CHECK: prfm pstl1strm
call void @llvm.prefetch(i8* %tmp19, i32 1, i32 0, i32 1)
%tmp20 = load i32** @a, align 8, !tbaa !3
%arrayidx27 = getelementptr inbounds i32* %tmp20, i64 %idxprom
%tmp21 = bitcast i32* %arrayidx15 to i8*
; CHECK: prfm pstl3keep
call void @llvm.prefetch(i8* %tmp21, i32 1, i32 1, i32 1)
%tmp22 = load i32** @a, align 8, !tbaa !3
%arrayidx30 = getelementptr inbounds i32* %tmp22, i64 %idxprom
%tmp23 = bitcast i32* %arrayidx18 to i8*
; CHECK: prfm pstl2keep
call void @llvm.prefetch(i8* %tmp23, i32 1, i32 2, i32 1)
%tmp24 = load i32** @a, align 8, !tbaa !3
%arrayidx33 = getelementptr inbounds i32* %tmp24, i64 %idxprom
%tmp25 = bitcast i32* %arrayidx21 to i8*
; CHECK: prfm pstl1keep
call void @llvm.prefetch(i8* %tmp17, i32 1, i32 3, i32 1)
call void @llvm.prefetch(i8* %tmp25, i32 1, i32 3, i32 1)
ret void
}