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

; RUN: opt < %s -deadargelim -die -S > %t
; RUN: cat %t | not grep DEAD
; RUN: cat %t | grep LIVE | count 4

@P = external global i32                ; <i32*> [#uses=1]

; Dead arg only used by dead retval
define internal i32 @test(i32 %DEADARG) {
        ret i32 %DEADARG
}

define internal i32 @test2(i32 %DEADARG) {
        %DEADRETVAL = call i32 @test( i32 %DEADARG )            ; <i32> [#uses=1]
        ret i32 %DEADRETVAL
}

define void @test3(i32 %X) {
        %DEADRETVAL = call i32 @test2( i32 %X )         ; <i32> [#uses=0]
        ret void
}

define internal i32 @foo() {
        %DEAD = load i32, i32* @P            ; <i32> [#uses=1]
        ret i32 %DEAD
}

define internal i32 @id(i32 %X) {
        ret i32 %X
}

define void @test4() {
        %DEAD = call i32 @foo( )                ; <i32> [#uses=1]
        %DEAD2 = call i32 @id( i32 %DEAD )              ; <i32> [#uses=0]
        ret void
}

; These test if returning another functions return value properly marks that
; other function's return value as live. We do this twice, with the functions in
; different orders (ie, first the caller, than the callee and first the callee
; and then the caller) since DAE processes functions one by one and handles
; these cases slightly different.

define internal i32 @test5() {
  ret i32 123 
}

define i32 @test6() {
  %LIVE = call i32 @test5()
  ret i32 %LIVE
}

define i32 @test7() {
  %LIVE = call i32 @test8()
  ret i32 %LIVE
}

define internal i32 @test8() {
  ret i32 124
}