ca78b6ed21
The debug messages are difficult to follow, because it is not printing which loops it is dealing with. This adds loop names to various debug messages so it's easier to see which loops it is accepting, rejecting, etc.
78 lines
2.0 KiB
LLVM
78 lines
2.0 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -passes=loop-interchange -debug -disable-output %s 2>&1 | FileCheck %s
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@A = global [16 x [16 x i32]] zeroinitializer
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; Check that the CacheCost is calculated only when required. In this case, it
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; is computed after passing the legality check.
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;
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; for (i = 0; i < 16; i++)
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; for (j = 0; j < 16; j++)
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; A[j][i] += 1;
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; CHECK: Loops 'for.i.header' and 'for.j' are legal to interchange
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; CHECK: Compute CacheCost
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define void @legal_to_interchange() {
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entry:
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br label %for.i.header
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for.i.header:
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%i = phi i32 [ 0, %entry ], [ %i.next, %for.i.latch ]
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br label %for.j
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for.j:
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%j = phi i32 [ 0, %for.i.header ], [ %j.next, %for.j ]
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%idx = getelementptr inbounds [16 x [16 x i32]], ptr @A, i32 0, i32 %j, i32 %i
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%val = load i32, ptr %idx
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%inc = add i32 %val, 1
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store i32 %inc, ptr %idx
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%j.next = add i32 %j, 1
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%j.exit = icmp eq i32 %j.next, 16
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br i1 %j.exit, label %for.i.latch, label %for.j
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for.i.latch:
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%i.next = add i32 %i, 1
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%i.exit = icmp eq i32 %i.next, 16
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br i1 %i.exit, label %exit, label %for.i.header
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exit:
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ret void
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}
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; Check that the CacheCost is not calculated when not required. In this case,
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; the legality check always fails so that we do not need to compute the
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; CacheCost.
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;
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; for (i = 0; i < 16; i++)
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; for (j = 0; j < 16; j++)
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; A[j][i] = A[i][j];
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; CHECK-NOT: Compute CacheCost
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define void @illegal_to_interchange() {
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entry:
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br label %for.i.header
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for.i.header:
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%i = phi i32 [ 0, %entry ], [ %i.next, %for.i.latch ]
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br label %for.j
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for.j:
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%j = phi i32 [ 0, %for.i.header ], [ %j.next, %for.j ]
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%idx.load = getelementptr inbounds [16 x [16 x i32]], ptr @A, i32 0, i32 %i, i32 %j
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%idx.store = getelementptr inbounds [16 x [16 x i32]], ptr @A, i32 0, i32 %j, i32 %i
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%val = load i32, ptr %idx.load
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store i32 %val, ptr %idx.store
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%j.next = add i32 %j, 1
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%j.exit = icmp eq i32 %j.next, 16
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br i1 %j.exit, label %for.i.latch, label %for.j
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for.i.latch:
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%i.next = add i32 %i, 1
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%i.exit = icmp eq i32 %i.next, 16
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br i1 %i.exit, label %exit, label %for.i.header
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exit:
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ret void
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}
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