reference, declaration → definition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced

    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89

; RUN: opt -S -early-cse < %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
declare void @readnone_function() readnone nounwind

define i32 @test0(i32* %x) {
; CHECK-LABEL: @test0(
 entry:
  store i32 100, i32* %x
; CHECK: store i32 100, i32* %x
  call void @readonly_function() [ "tag"() ]
; CHECK: call void @readonly_function()

  %v = load i32, i32* %x
; CHECK: %v = load i32, i32* %x
; CHECK: ret i32 %v
  ret i32 %v
}

define i32 @test1(i32* %x) {
; CHECK: @test1(
 entry:
  store i32 100, i32* %x
; CHECK: store i32 100, i32* %x
  call void @readonly_function() readonly [ "tag"() ]
; CHECK-NOT: call void @readonly_function
  %v = load i32, i32* %x
  ret i32 %v
; CHECK: ret i32 100
}

define i32 @test3(i32* %x) {
; CHECK-LABEL: @test3(
 entry:
  store i32 100, i32* %x
; CHECK: store i32 100, i32* %x
  call void @readonly_function()
; CHECK-NOT: call void @readonly_function
  %v = load i32, i32* %x
  ret i32 %v
; CHECK: ret i32 100
}

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

define void @test5(i32* %x) {
; CHECK-LABEL: @test5(
 entry:
  store i32 100, i32* %x
; CHECK-NOT: store i32 100, i32* %x
; CHECK-NOT: call void @readnone_function
  call void @readnone_function() readnone [ "tag"() ]
  store i32 200, i32* %x
; CHECK: 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(
 entry:

; CHECK-NEXT: entry:
; CHECK-NEXT:  store i32 200, i32* %x
; CHECK-NEXT:  ret void

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