derek.holloway
7502bf64a4
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70 lines
2.4 KiB
LLVM
70 lines
2.4 KiB
LLVM
; RUN: opt -verify-loop-info -irce-print-changed-loops -passes=irce -S
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; RUN: opt -verify-loop-info -irce-print-changed-loops -passes='require<branch-prob>,irce' -S
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; Make sure that IRCE doesn't apply in case of empty ranges.
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; (i + 30 < 40) if i in [-30, 10).
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; Intersected with iteration space, it is [0, 10).
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; (i - 60 < 40) if i in [60 , 100).
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; The intersection with safe iteration space is the empty range [60, 10).
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; It is better to eliminate one range check than attempt to eliminate both given
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; that we will never go to the main loop in the latter case and basically
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; only duplicate code with no benefits.
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define void @test_01(ptr %arr, ptr %a_len_ptr) #0 {
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; CHECK-LABEL: test_01(
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; CHECK-NOT: preloop
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; CHECK: entry:
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; CHECK-NEXT: br i1 true, label %loop.preheader, label %main.pseudo.exit
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; CHECK: in.bounds.1:
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; CHECK-NEXT: %addr = getelementptr i32, ptr %arr, i32 %idx
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; CHECK-NEXT: store i32 0, ptr %addr
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; CHECK-NEXT: %off1 = add i32 %idx, 30
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; CHECK-NEXT: %c2 = icmp slt i32 %off1, 40
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; CHECK-NEXT: br i1 true, label %in.bounds.2, label %exit.loopexit2
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; CHECK: in.bounds.2:
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; CHECK-NEXT: %off2 = add i32 %idx, -60
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; CHECK-NEXT: %c3 = icmp slt i32 %off2, 40
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; CHECK-NEXT: br i1 %c3, label %in.bounds.3, label %exit.loopexit2
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; CHECK: in.bounds.3:
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; CHECK-NEXT: %next = icmp ult i32 %idx.next, 100
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; CHECK-NEXT: [[COND1:%[^ ]+]] = icmp ult i32 %idx.next, 10
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; CHECK-NEXT: br i1 [[COND1]], label %loop, label %main.exit.selector
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; CHECK: main.exit.selector:
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; CHECK-NEXT: %idx.next.lcssa = phi i32 [ %idx.next, %in.bounds.3 ]
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; CHECK-NEXT: [[COND2:%[^ ]+]] = icmp ult i32 %idx.next.lcssa, 100
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; CHECK-NEXT: br i1 [[COND2]], label %main.pseudo.exit, label %exit
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; CHECK: postloop:
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entry:
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br label %loop
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loop:
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds.3 ]
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%idx.next = add nsw nuw i32 %idx, 1
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%c1 = icmp slt i32 %idx, 20
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br i1 %c1, label %in.bounds.1, label %out.of.bounds
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in.bounds.1:
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%addr = getelementptr i32, ptr %arr, i32 %idx
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store i32 0, ptr %addr
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%off1 = add i32 %idx, 30
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%c2 = icmp slt i32 %off1, 40
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br i1 %c2, label %in.bounds.2, label %exit
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in.bounds.2:
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%off2 = add i32 %idx, -60
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%c3 = icmp slt i32 %off2, 40
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br i1 %c3, label %in.bounds.3, label %exit
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in.bounds.3:
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%next = icmp ult i32 %idx.next, 100
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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}
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