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1cfe6f1f1d
Summary: Avoid HW prefetcher instruction tag collisions in loops by inserting MOVs to change the base address register of strided loads. Reviewers: t.p.northover, mcrosier Subscribers: aemerson, rengolin, javed.absar, kristof.beyls, hfinkel, llvm-commits Differential Revision: https://reviews.llvm.org/D35366 llvm-svn: 308324
68 lines
1.9 KiB
LLVM
68 lines
1.9 KiB
LLVM
; RUN: llc < %s -mtriple aarch64 -mcpu=falkor -disable-post-ra | FileCheck %s
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; Check that strided load tag collisions are avoided on Falkor.
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; CHECK-LABEL: hwpf1:
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; CHECK: ldp {{w[0-9]+}}, {{w[0-9]+}}, [x[[BASE:[0-9]+]], #-16]
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; CHECK: mov x[[BASE2:[0-9]+]], x[[BASE]]
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; CHECK: ldp {{w[0-9]+}}, {{w[0-9]+}}, [x[[BASE2]], #-8]
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; CHECK: ldp {{w[0-9]+}}, {{w[0-9]+}}, [x[[BASE3:[0-9]+]]]
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; CHECK: mov x[[BASE4:[0-9]+]], x[[BASE3]]
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; CHECK: ldp {{w[0-9]+}}, {{w[0-9]+}}, [x[[BASE4]], #8]
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define void @hwpf1(i32* %p, i32* %sp, i32* %sp2, i32* %sp3, i32* %sp4) {
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
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%gep = getelementptr inbounds i32, i32* %p, i32 %iv
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%load1 = load i32, i32* %gep
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%gep2 = getelementptr inbounds i32, i32* %gep, i32 1
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%load2 = load i32, i32* %gep2
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%add = add i32 %load1, %load2
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%storegep = getelementptr inbounds i32, i32* %sp, i32 %iv
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store i32 %add, i32* %storegep
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%gep3 = getelementptr inbounds i32, i32* %gep, i32 2
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%load3 = load i32, i32* %gep3
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%gep4 = getelementptr inbounds i32, i32* %gep, i32 3
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%load4 = load i32, i32* %gep4
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%add2 = add i32 %load3, %load4
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%storegep2 = getelementptr inbounds i32, i32* %sp2, i32 %iv
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store i32 %add2, i32* %storegep2
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%gep5 = getelementptr inbounds i32, i32* %gep, i32 4
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%load5 = load i32, i32* %gep5
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%gep6 = getelementptr inbounds i32, i32* %gep, i32 5
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%load6 = load i32, i32* %gep6
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%add3 = add i32 %load5, %load6
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%storegep3 = getelementptr inbounds i32, i32* %sp3, i32 %iv
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store i32 %add3, i32* %storegep3
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%gep7 = getelementptr inbounds i32, i32* %gep, i32 6
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%load7 = load i32, i32* %gep7
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%gep8 = getelementptr inbounds i32, i32* %gep, i32 7
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%load8 = load i32, i32* %gep8
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%add4 = add i32 %load7, %load8
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%storegep4 = getelementptr inbounds i32, i32* %sp4, i32 %iv
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store i32 %add4, i32* %storegep4
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%inc = add i32 %iv, 8
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%exitcnd = icmp uge i32 %inc, 1024
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br i1 %exitcnd, label %exit, label %loop
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exit:
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ret void
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}
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