test/Transforms/MemProfContextDisambiguation/tailcall-nonunique.ll

;; Test to make sure that missing tail call frames in memprof profiles are
;; identified but not cloned when there are multiple non-unique possible
;; tail call chains between the profiled frames.

;; -stats requires asserts
; REQUIRES: asserts

; RUN: opt -passes=memprof-context-disambiguation -supports-hot-cold-new \
; RUN:	-memprof-export-to-dot -memprof-dot-file-path-prefix=%t. \
; RUN:  -stats -debug %s -S 2>&1 | FileCheck %s --check-prefix=STATS \
; RUN:  --check-prefix=IR --check-prefix=DEBUG

; DEBUG: Not found through unique tail call chain: _Z3barv from main that actually called xyz (found multiple possible chains)

;; Graph fixup should have nulled the call in the node that could not be
;; resolved via tail call fixup. That happens in between the initial
;; stack update and the end of graph building.
; RUN:  cat %t.ccg.poststackupdate.dot | FileCheck %s --check-prefix=DOTPOSTSTACKUPDATE
; DOTPOSTSTACKUPDATE: {OrigId: 15025054523792398438\nmain -\> xyz}
; RUN:  cat %t.ccg.postbuild.dot | FileCheck %s --check-prefix=DOTPOSTBUILD
; DOTPOSTBUILD: {OrigId: 15025054523792398438\nnull call (external)}

;; Check that all calls in the IR are to the original functions, leading to a
;; non-cold operator new call.

source_filename = "tailcall-nonunique.cc"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: noinline
; IR-LABEL: @_Z3barv()
define dso_local ptr @_Z3barv() local_unnamed_addr #0 {
entry:
  ; IR: call ptr @_Znam(i64 10) #[[NOTCOLD:[0-9]+]]
  %call = tail call ptr @_Znam(i64 10) #2, !memprof !0, !callsite !9
  ret ptr %call
}

; Function Attrs: nobuiltin allocsize(0)
declare ptr @_Znam(i64) #1

; Function Attrs: noinline
; IR-LABEL: @_Z5blah1v()
define dso_local ptr @_Z5blah1v() local_unnamed_addr #0 {
entry:
  ; IR: call ptr @_Z3barv()
  %call = tail call ptr @_Z3barv()
  ret ptr %call
}

; Function Attrs: noinline
; IR-LABEL: @_Z5blah2v()
define dso_local ptr @_Z5blah2v() local_unnamed_addr #0 {
entry:
  ; IR: call ptr @_Z3barv()
  %call = tail call ptr @_Z3barv()
  ret ptr %call
}

; Function Attrs: noinline
; IR-LABEL: @_Z4baz1v()
define dso_local ptr @_Z4baz1v() local_unnamed_addr #0 {
entry:
  ; IR: call ptr @_Z5blah1v()
  %call = tail call ptr @_Z5blah1v()
  ret ptr %call
}

; Function Attrs: noinline
; IR-LABEL: @_Z4baz2v()
define dso_local ptr @_Z4baz2v() local_unnamed_addr #0 {
entry:
  ; IR: call ptr @_Z5blah2v()
  %call = tail call ptr @_Z5blah2v()
  ret ptr %call
}

; Function Attrs: noinline
; IR-LABEL: @_Z3foob(i1 %b)
define dso_local ptr @_Z3foob(i1 %b) local_unnamed_addr #0 {
entry:
  br i1 %b, label %if.then, label %if.else

if.then:                                          ; preds = %entry
  ; IR: call ptr @_Z4baz1v()
  %call = tail call ptr @_Z4baz1v()
  br label %return

if.else:                                          ; preds = %entry
  ; IR: call ptr @_Z4baz2v()
  %call1 = tail call ptr @_Z4baz2v()
  br label %return

return:                                           ; preds = %if.else, %if.then
  %retval.0 = phi ptr [ %call, %if.then ], [ %call1, %if.else ]
  ret ptr %retval.0
}

; Function Attrs: noinline
; IR-LABEL: @xyz()
define dso_local i32 @xyz() local_unnamed_addr #0 {
  ; IR: call ptr @_Z3foob(i1 true)
  %call = tail call ptr @_Z3foob(i1 true)
  ; IR: call ptr @_Z3foob(i1 true)
  %call1 = tail call ptr @_Z3foob(i1 true)
  ; IR: call ptr @_Z3foob(i1 false)
  %call2 = tail call ptr @_Z3foob(i1 false)
  ; IR: call ptr @_Z3foob(i1 false)
  %call3 = tail call ptr @_Z3foob(i1 false)
  ret i32 0
}

define dso_local i32 @main() local_unnamed_addr #0 {
  ; IR: call i32 @xyz()
  %call1 = tail call i32 @xyz(), !callsite !11
  ret i32 0
}

; IR: attributes #[[NOTCOLD]] = { builtin allocsize(0) "memprof"="notcold" }

; STATS: 1 memprof-context-disambiguation - Number of profiled callees found via multiple tail call chains

attributes #0 = { noinline }
attributes #1 = { nobuiltin allocsize(0) }
attributes #2 = { builtin allocsize(0) }

!0 = !{!5, !7}
!5 = !{!6, !"notcold"}
!6 = !{i64 3186456655321080972, i64 8632435727821051414}
!7 = !{!8, !"cold"}
!8 = !{i64 3186456655321080972, i64 -3421689549917153178}
!9 = !{i64 3186456655321080972}
!11 = !{i64 -3421689549917153178}