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

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llvm-toolchain-16 1%3A16.0.6-15~deb12u1
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; RUN: opt %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -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(ptr)
declare void @trap()

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

entry:
  %x.int = ptrtoint ptr %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(ptr %x)
  ret i32 %0

is_null:
  call void @trap()
  unreachable
}

!0 = !{}