File: preserve-make-implicit-on-switch-to-br.ll

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llvm-toolchain-11 1%3A11.0.1-2
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; RUN: opt %s -simplifycfg -S | FileCheck %s

; ConstantFoldTerminator function can convert SwitchInst with one case (and default) to
; a conditional BranchInst. This test checks the converted BranchInst preserve the 
; make.implicit metadata.

declare i32 @consume(i32*)
declare void @trap()

define i32 @copy-metadata(i32* %x) {

entry:
  %x.int = ptrtoint i32* %x to i64
  
; CHECK: br i1 %cond, label %is_null, label %default, !make.implicit !0
  switch i64 %x.int, label %default [
    i64 0, label %is_null
  ], !make.implicit !0
  
default:
  %0 = call i32 @consume(i32* %x)
  ret i32 %0

is_null:
  call void @trap()
  unreachable
}

!0 = !{}