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66 lines
1.6 KiB
LLVM
66 lines
1.6 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; Test that a switch going to a switch on the same value can be merged.
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; All three switches in this example can be merged into one big one.
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declare void @foo1()
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declare void @foo2()
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declare void @foo3()
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declare void @foo4()
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define void @test1(i32 %V) {
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switch i32 %V, label %F [
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i32 4, label %T
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i32 17, label %T
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i32 5, label %T
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i32 1234, label %F
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]
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T: ; preds = %0, %0, %0
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switch i32 %V, label %F [
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i32 4, label %A
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i32 17, label %B
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i32 42, label %C
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]
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A: ; preds = %T
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call void @foo1( )
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ret void
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B: ; preds = %F, %F, %T
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call void @foo2( )
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ret void
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C: ; preds = %T
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call void @foo3( )
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ret void
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F: ; preds = %F, %T, %0, %0
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switch i32 %V, label %F [
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i32 4, label %B
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i32 18, label %B
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i32 42, label %D
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]
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D: ; preds = %F
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call void @foo4( )
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ret void
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: switch i32 %V, label %infloop [
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; CHECK-NEXT: i32 4, label %A
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; CHECK-NEXT: i32 17, label %B
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; CHECK-NEXT: i32 18, label %B
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; CHECK-NEXT: i32 42, label %D
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; CHECK-NEXT: ]
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; CHECK: A:
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; CHECK-NEXT: call void @foo1()
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; CHECK-NEXT: ret void
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; CHECK: B:
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; CHECK-NEXT: call void @foo2()
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; CHECK-NEXT: ret void
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; CHECK: D:
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; CHECK-NEXT: call void @foo4()
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; CHECK-NEXT: ret void
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; CHECK: infloop:
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; CHECK-NEXT: br label %infloop
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}
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