derek.holloway
7502bf64a4
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95 lines
2.4 KiB
LLVM
95 lines
2.4 KiB
LLVM
; RUN: opt < %s -passes=loop-interchange -cache-line-size=64 -pass-remarks-missed='loop-interchange' -pass-remarks-output=%t -S
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; RUN: FileCheck --input-file=%t %s
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@b = external dso_local global [5 x i32], align 16
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;; Not profitable to interchange, because the access is invariant to j loop.
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;;
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;; for(int i=0;i<4;i++) {
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;; for(int j=1;j<4;j++) {
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;; b[i] = ....
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;; }
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;; }
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: loop-interchange
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; CHECK-NEXT: Name: Dependence
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; CHECK-NEXT: Function: test1
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: Cannot interchange loops due to dependences.
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define void @test1() {
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entry:
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br label %outer.header
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outer.header:
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%i = phi i32 [ %i.next, %outer.latch ], [ 0, %entry ]
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br label %inner.header
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inner.header:
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%j = phi i32 [ %j.next, %inner.latch ], [ 1, %outer.header ]
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br label %inner.latch
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inner.latch:
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%idxprom = sext i32 %i to i64
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%arrayidx = getelementptr inbounds [5 x i32], ptr @b, i64 0, i64 %idxprom
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%0 = load i32, ptr %arrayidx, align 4
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store i32 undef, ptr %arrayidx, align 4
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%cmp = icmp slt i32 %j, 4
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%j.next = add nuw nsw i32 %j, 1
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br i1 %cmp, label %inner.header, label %outer.body
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outer.body:
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br label %outer.latch
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outer.latch:
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%i.next = add nsw i32 %i, 1
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%cmp2 = icmp slt i32 %i, 4
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br i1 %cmp2, label %outer.header, label %exit
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exit:
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ret void
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}
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: loop-interchange
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; CHECK-NEXT: Name: Dependence
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; CHECK-NEXT: Function: test2
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: Cannot interchange loops due to dependences.
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define void @test2() {
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entry:
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br label %outer.header
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outer.header:
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%i = phi i32 [ %i.next, %outer.latch ], [ 0, %entry ]
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br label %inner.header
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inner.header:
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%lsr.iv = phi i32 [ %lsr.iv.next, %inner.latch ], [ 1, %outer.header ]
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br label %inner.latch
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inner.latch:
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%idxprom = sext i32 %i to i64
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%arrayidx = getelementptr inbounds [5 x i32], ptr @b, i64 0, i64 %idxprom
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%0 = load i32, ptr %arrayidx, align 4
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%cmp = icmp slt i32 %lsr.iv, 4
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%cmp.zext = zext i1 %cmp to i32
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store i32 %cmp.zext, ptr %arrayidx, align 4
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%lsr.iv.next = add nuw nsw i32 %lsr.iv, 1
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br i1 %cmp, label %inner.header, label %outer.body
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outer.body:
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br label %outer.latch
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outer.latch:
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%i.next = add nsw i32 %i, 1
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%cmp2 = icmp slt i32 %i, 4
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br i1 %cmp2, label %outer.header, label %exit
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exit:
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ret void
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}
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