test/Transforms/InstCombine/sink-into-ncd.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=instcombine -S < %s | FileCheck %s

target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc18.0.0"

declare i32 @use(ptr)

; Should be able to sink %ptr load to %not.null block which is the NCD of %ptr users.
define i32 @test1(ptr %addr, i1 %c) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[PTR:%.*]] = load ptr, ptr [[ADDR:%.*]], align 8
; CHECK-NEXT:    br i1 false, label [[NULL:%.*]], label [[NOT_NULL:%.*]]
; CHECK:       null:
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       not.null:
; CHECK-NEXT:    [[Y:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT:    br i1 [[C:%.*]], label [[EXIT]], label [[NOT_NULL_2:%.*]]
; CHECK:       not.null.2:
; CHECK-NEXT:    [[Z:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    [[P:%.*]] = phi i32 [ poison, [[NULL]] ], [ [[Y]], [[NOT_NULL]] ], [ [[Z]], [[NOT_NULL_2]] ]
; CHECK-NEXT:    ret i32 [[P]]
;
entry:
  %ptr = load ptr, ptr %addr
  %cond = icmp eq ptr %addr, null
  br i1 %cond, label %null, label %not.null

null:
  %x = call i32 @use(ptr null)
  br label %exit

not.null:
  %y = call i32 @use(ptr %ptr)
  br i1 %c, label %exit, label %not.null.2

not.null.2:
  %z = call i32 @use(ptr %ptr)
  br label %exit

exit:
  %p = phi i32 [ %x, %null ], [ %y, %not.null ], [ %z, %not.null.2 ]
  ret i32 %p
}

; Should be able to sink %ptr load to %not.null block which is the NCD of %ptr users.
define i32 @test2(ptr %addr, i1 %c) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[COND:%.*]] = icmp eq ptr [[ADDR:%.*]], null
; CHECK-NEXT:    br i1 [[COND]], label [[EXIT:%.*]], label [[LOAD_BB:%.*]]
; CHECK:       load.bb:
; CHECK-NEXT:    [[PTR:%.*]] = load ptr, ptr [[ADDR]], align 8
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[X:%.*]] = call i32 @use(ptr null)
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       right:
; CHECK-NEXT:    [[Y:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[RIGHT_2:%.*]]
; CHECK:       right.2:
; CHECK-NEXT:    [[Z:%.*]] = call i32 @use(ptr [[PTR]])
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    [[P:%.*]] = phi i32 [ [[X]], [[LEFT]] ], [ [[Y]], [[RIGHT]] ], [ [[Z]], [[RIGHT_2]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[P]]
;
entry:
  %cond = icmp eq ptr %addr, null
  br i1 %cond, label %exit, label %load.bb

load.bb:
  %ptr = load ptr, ptr %addr
  br i1 %c, label %left, label %right

left:
  %x = call i32 @use(ptr null)
  br label %exit

right:
  %y = call i32 @use(ptr %ptr)
  br i1 %c, label %exit, label %right.2

right.2:
  %z = call i32 @use(ptr %ptr)
  br label %exit

exit:
  %p = phi i32 [ %x, %left ], [ %y, %right ], [ %z, %right.2 ], [ 0, %entry ]
  ret i32 %p
}