File: 2014-06-23-PHIlowering.ll

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llvm-toolchain-17 1%3A17.0.6-22
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; RUN: opt < %s -passes=lowerswitch -S | FileCheck %s

define i32 @test(i32 %arg) #0 {
; CHECK-LABEL: @test
; CHECK: 2:
; CHECK-NEXT:  %res.0 = phi i32 [ 1, %NodeBlock ], [ 2, %1 ]
; CHECK-NEXT:  br label %3
; CHECK: 5:
; CHECK-NEXT:   %res.3 = phi i32 [ %res.2, %4 ], [ 0, %LeafBlock ], [ 0, %LeafBlock1 ]
; CHECK-NEXT:   %6 = add nsw i32 %res.3, 1
; CHECK-NEXT:   ret i32 %6

  switch i32 %arg, label %5 [
    i32 1, label %1
    i32 2, label %2
    i32 3, label %3
    i32 4, label %4
  ]

1:
  br label %2

2:
  %res.0 = phi i32 [ 1, %0 ], [ 2, %1 ]
  br label %3

3:
  %res.1 = phi i32 [ 0, %0 ], [ %res.0, %2 ]
  %phitmp = add nsw i32 %res.1, 2
  br label %4

4:
  %res.2 = phi i32 [ 1, %0 ], [ %phitmp, %3 ]
  br label %5

5:
  %res.3 = phi i32 [ 0, %0 ], [ %res.2, %4 ]
  %6 = add nsw i32 %res.3, 1
  ret i32 %6
}