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e2c6d131d1
- Eliminate redundant successors. - Convert an indirectbr with one successor into a direct branch. Also, generalize SimplifyCFG to be able to be run on a function entry block. It knows quite a few simplifications which are applicable to the entry block, and it only needs a few checks to avoid trouble with the entry block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111060 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
1.1 KiB
LLVM
59 lines
1.1 KiB
LLVM
; Test CFG simplify removal of branch instructions.
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;
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; RUN: opt < %s -simplifycfg -S | FileCheck %s
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define void @test1() {
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br label %BB1
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BB1: ; preds = %0
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ret void
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; CHECK: @test1
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; CHECK-NEXT: ret void
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}
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define void @test2() {
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ret void
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BB1: ; No predecessors!
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ret void
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; CHECK: @test2
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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}
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define void @test3(i1 %T) {
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br i1 %T, label %BB1, label %BB1
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BB1: ; preds = %0, %0
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ret void
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; CHECK: @test3
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; CHECK-NEXT: ret void
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}
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define void @test4() {
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br label %return
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return:
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ret void
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; CHECK: @test4
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; CHECK-NEXT: ret void
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}
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@test4g = global i8* blockaddress(@test4, %return)
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; PR5795
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define void @test5(i32 %A) {
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switch i32 %A, label %return [
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i32 2, label %bb
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i32 10, label %bb1
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]
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bb: ; preds = %entry
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ret void
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bb1: ; preds = %entry
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ret void
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return: ; preds = %entry
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ret void
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; CHECK: @test5
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; CHECK-NEXT: ret void
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}
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