llvm/test/Transforms/SimplifyCFG/switch-to-select-multiple-edge-per-block-phi.ll

; RUN: opt < %s -simplifycfg -S | FileCheck %s

; a, b;
; fn1() {
;   if (b)
;     if (a == 0 || a == 5)
;       return a;
;   return 0;
; }

; Checking that we handle correctly the case when we have a switch
; branching multiple times to the same block

@b = common global i32 0, align 4
@a = common global i32 0, align 4

; Function Attrs: nounwind
define i32 @fn1() {
; CHECK-LABEL: @fn1
; CHECK: %switch.selectcmp1 = icmp eq i32 %1, 5
; CHECK: %switch.select2 = select i1 %switch.selectcmp1, i32 5, i32 %switch.select
entry:
  %0 = load i32* @b, align 4
  %tobool = icmp eq i32 %0, 0
  br i1 %tobool, label %if.end3, label %if.then

if.then:
  %1 = load i32* @a, align 4
  switch i32 %1, label %if.end3 [
    i32 5, label %return
    i32 0, label %return
  ]

if.end3:
  br label %return

return:
  %retval.0 = phi i32 [ 0, %if.end3 ], [ %1, %if.then ], [ %1, %if.then ]
  ret i32 %retval.0
}