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82 lines
2.0 KiB
LLVM
82 lines
2.0 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; CHECK-NOT: switch
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; Test normal folding
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define i32 @test1() {
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switch i32 5, label %Default [
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i32 0, label %Foo
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i32 1, label %Bar
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i32 2, label %Baz
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i32 5, label %TheDest
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]
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Default: ; preds = %0
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ret i32 -1
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Foo: ; preds = %0
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ret i32 -2
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Bar: ; preds = %0
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ret i32 -3
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Baz: ; preds = %0
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ret i32 -4
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TheDest: ; preds = %0
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ret i32 1234
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}
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; Test folding to default dest
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define i32 @test2() {
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switch i32 3, label %Default [
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i32 0, label %Foo
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i32 1, label %Bar
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i32 2, label %Baz
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i32 5, label %TheDest
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]
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Default: ; preds = %0
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ret i32 1234
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Foo: ; preds = %0
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ret i32 -2
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Bar: ; preds = %0
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ret i32 -5
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Baz: ; preds = %0
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ret i32 -6
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TheDest: ; preds = %0
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ret i32 -8
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}
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; Test folding all to same dest
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define i32 @test3(i1 %C) {
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br i1 %C, label %Start, label %TheDest
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Start: ; preds = %0
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switch i32 3, label %TheDest [
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i32 0, label %TheDest
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i32 1, label %TheDest
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i32 2, label %TheDest
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i32 5, label %TheDest
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]
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TheDest: ; preds = %Start, %Start, %Start, %Start, %Start, %0
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ret i32 1234
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}
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; Test folding switch -> branch
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define i32 @test4(i32 %C) {
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switch i32 %C, label %L1 [
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i32 0, label %L2
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]
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L1: ; preds = %0
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ret i32 0
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L2: ; preds = %0
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ret i32 1
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}
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; Can fold into a cond branch!
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define i32 @test5(i32 %C) {
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switch i32 %C, label %L1 [
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i32 0, label %L2
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i32 123, label %L1
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]
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L1: ; preds = %0, %0
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ret i32 0
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L2: ; preds = %0
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ret i32 1
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}
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