66 lines
2.1 KiB
LLVM
66 lines
2.1 KiB
LLVM
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; REQUIRES: asserts
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; RUN: opt -passes='print<access-info>' -debug-only=loop-accesses -disable-output < %s 2>&1 | FileCheck %s
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; void negative_step(int *A) {
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; for (int i = 1022; i >= 0; i--)
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; A[i+1] = A[i] + 1;
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; }
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; CHECK: LAA: Found a loop in negative_step: loop
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; CHECK: LAA: Checking memory dependencies
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; CHECK-NEXT: LAA: Src Scev: {(4092 + %A),+,-4}<nw><%loop>Sink Scev: {(4088 + %A)<nuw>,+,-4}<nw><%loop>(Induction step: -1)
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; CHECK-NEXT: LAA: Distance for store i32 %add, ptr %gep.A.plus.1, align 4 to %l = load i32, ptr %gep.A, align 4: -4
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; CHECK-NEXT: LAA: Dependence is negative
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define void @negative_step(ptr nocapture %A) {
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entry:
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%A.plus.1 = getelementptr i32, ptr %A, i64 1
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br label %loop
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loop:
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%iv = phi i64 [ 1022, %entry ], [ %iv.next, %loop ]
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%gep.A = getelementptr inbounds i32, ptr %A, i64 %iv
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%l = load i32, ptr %gep.A, align 4
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%add = add nsw i32 %l, 1
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%gep.A.plus.1 = getelementptr i32, ptr %A.plus.1, i64 %iv
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store i32 %add, ptr %gep.A.plus.1, align 4
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%iv.next = add nsw i64 %iv, -1
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%cmp.not = icmp eq i64 %iv, 0
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br i1 %cmp.not, label %exit, label %loop
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exit:
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ret void
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}
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; void positive_step(int *A) {
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; for (int i = 1; i < 1024; i++)
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; A[i-1] = A[i] + 1;
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; }
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; CHECK: LAA: Found a loop in positive_step: loop
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; CHECK: LAA: Checking memory dependencies
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; CHECK-NEXT: LAA: Src Scev: {(4 + %A)<nuw>,+,4}<nuw><%loop>Sink Scev: {%A,+,4}<nw><%loop>(Induction step: 1)
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; CHECK-NEXT: LAA: Distance for %l = load i32, ptr %gep.A, align 4 to store i32 %add, ptr %gep.A.minus.1, align 4: -4
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; CHECK-NEXT: LAA: Dependence is negative
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define void @positive_step(ptr nocapture %A) {
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entry:
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%A.minus.1 = getelementptr i32, ptr %A, i64 -1
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br label %loop
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loop:
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%iv = phi i64 [ 1, %entry ], [ %iv.next, %loop ]
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%gep.A = getelementptr inbounds i32, ptr %A, i64 %iv
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%l = load i32, ptr %gep.A, align 4
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%add = add nsw i32 %l, 1
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%gep.A.minus.1 = getelementptr i32, ptr %A.minus.1, i64 %iv
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store i32 %add, ptr %gep.A.minus.1, align 4
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%iv.next = add nsw i64 %iv, 1
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%cmp.not = icmp eq i64 %iv, 1024
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br i1 %cmp.not, label %exit, label %loop
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exit:
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ret void
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}
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