test/Feature/OperandBundles/early-cse.ll

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

; While it is normally okay to do memory optimizations over calls to
; @readonly_function and @readnone_function, we cannot do that if
; they're carrying unknown operand bundles since the presence of
; unknown operand bundles implies arbitrary memory effects.

declare void @readonly_function() readonly nounwind willreturn
declare void @readnone_function() readnone nounwind willreturn

define i32 @test0(i32* %x) {
; CHECK-LABEL: @test0(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 100, i32* [[X:%.*]], align 4
; CHECK-NEXT:    call void @readonly_function() [ "tag"() ]
; CHECK-NEXT:    [[V:%.*]] = load i32, i32* [[X]], align 4
; CHECK-NEXT:    ret i32 [[V]]
;
  entry:
  store i32 100, i32* %x
  call void @readonly_function() [ "tag"() ]

  %v = load i32, i32* %x
  ret i32 %v
}

define i32 @test1(i32* %x) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 100, i32* [[X:%.*]], align 4
; CHECK-NEXT:    ret i32 100
;
  entry:
  store i32 100, i32* %x
  call void @readonly_function() readonly [ "tag"() ]
  %v = load i32, i32* %x
  ret i32 %v
}

define i32 @test3(i32* %x) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 100, i32* [[X:%.*]], align 4
; CHECK-NEXT:    ret i32 100
;
  entry:
  store i32 100, i32* %x
  call void @readonly_function()
  %v = load i32, i32* %x
  ret i32 %v
}

define void @test4(i32* %x) {
; CHECK-LABEL: @test4(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 100, i32* [[X:%.*]], align 4
; CHECK-NEXT:    call void @readnone_function() [ "tag"() ]
; CHECK-NEXT:    store i32 200, i32* [[X]], align 4
; CHECK-NEXT:    ret void
;
  entry:
  store i32 100, i32* %x
  call void @readnone_function() [ "tag"() ]
  store i32 200, i32* %x
  ret void
}

define void @test5(i32* %x) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 200, i32* [[X:%.*]], align 4
; CHECK-NEXT:    ret void
;
  entry:
  store i32 100, i32* %x
  call void @readnone_function() readnone [ "tag"() ]
  store i32 200, i32* %x
  ret void
}

define void @test6(i32* %x) {
; The "deopt" operand bundle does not make the call to
; @readonly_function read-write; and so the nounwind readonly call can
; be deleted.
; CHECK-LABEL: @test6(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 200, i32* [[X:%.*]], align 4
; CHECK-NEXT:    ret void
;
  entry:


  store i32 100, i32* %x
  call void @readonly_function() [ "deopt"() ]
  store i32 200, i32* %x
  ret void
}