Added struct type cast to parameter value list call printf_string main::name (struct printf_format_string){ 0, 0 } 
Inlined call call __init 
Eliminating unused variable with no statement main::$0

CONTROL FLOW GRAPH SSA

void cputs(byte* cputs::str)
cputs: scope:[cputs]  from main main::@2 printf_string
  screen#25 = phi( main/screen#23, main::@2/screen#5, printf_string/screen#22 )
  cputs::str#6 = phi( main/cputs::str#2, main::@2/cputs::str#3, printf_string/cputs::str#1 )
  to:cputs::@1
cputs::@1: scope:[cputs]  from cputs cputs::@2
  screen#21 = phi( cputs/screen#25, cputs::@2/screen#0 )
  cputs::str#4 = phi( cputs/cputs::str#6, cputs::@2/cputs::str#0 )
  cputs::$0 = 0 != *cputs::str#4
  if(cputs::$0) goto cputs::@2
  to:cputs::@return
cputs::@2: scope:[cputs]  from cputs::@1
  screen#11 = phi( cputs::@1/screen#21 )
  cputs::str#5 = phi( cputs::@1/cputs::str#4 )
  *screen#11 = *cputs::str#5
  screen#0 = ++ screen#11
  cputs::str#0 = ++ cputs::str#5
  to:cputs::@1
cputs::@return: scope:[cputs]  from cputs::@1
  screen#12 = phi( cputs::@1/screen#21 )
  screen#1 = screen#12
  return 
  to:@return

void printf_string(byte* printf_string::str , byte printf_string::format_min_length , byte printf_string::format_justify_left)
printf_string: scope:[printf_string]  from main::@1
  screen#22 = phi( main::@1/screen#4 )
  printf_string::str#1 = phi( main::@1/printf_string::str#0 )
  cputs::str#1 = printf_string::str#1
  call cputs 
  to:printf_string::@1
printf_string::@1: scope:[printf_string]  from printf_string
  screen#13 = phi( printf_string/screen#1 )
  screen#2 = screen#13
  to:printf_string::@return
printf_string::@return: scope:[printf_string]  from printf_string::@1
  screen#14 = phi( printf_string::@1/screen#2 )
  screen#3 = screen#14
  return 
  to:@return

void main()
main: scope:[main]  from __start::@1
  screen#23 = phi( __start::@1/screen#24 )
  cputs::str#2 = main::str
  call cputs 
  to:main::@1
main::@1: scope:[main]  from main
  screen#15 = phi( main/screen#1 )
  screen#4 = screen#15
  printf_string::str#0 = main::name
  printf_string::format_min_length#0 = 0
  printf_string::format_justify_left#0 = 0
  call printf_string 
  to:main::@2
main::@2: scope:[main]  from main::@1
  screen#16 = phi( main::@1/screen#3 )
  screen#5 = screen#16
  cputs::str#3 = main::str1
  call cputs 
  to:main::@3
main::@3: scope:[main]  from main::@2
  screen#17 = phi( main::@2/screen#1 )
  screen#6 = screen#17
  to:main::@return
main::@return: scope:[main]  from main::@3
  screen#18 = phi( main::@3/screen#6 )
  screen#7 = screen#18
  return 
  to:@return

void __start()
__start: scope:[__start]  from
  to:__start::__init1
__start::__init1: scope:[__start]  from __start
  screen#8 = (byte*)$400
  to:__start::@1
__start::@1: scope:[__start]  from __start::__init1
  screen#24 = phi( __start::__init1/screen#8 )
  call main 
  to:__start::@2
__start::@2: scope:[__start]  from __start::@1
  screen#19 = phi( __start::@1/screen#7 )
  screen#9 = screen#19
  to:__start::@return
__start::@return: scope:[__start]  from __start::@2
  screen#20 = phi( __start::@2/screen#9 )
  screen#10 = screen#20
  return 
  to:@return

SYMBOL TABLE SSA
void __start()
void cputs(byte* cputs::str)
bool~ cputs::$0
byte* cputs::str
byte* cputs::str#0
byte* cputs::str#1
byte* cputs::str#2
byte* cputs::str#3
byte* cputs::str#4
byte* cputs::str#5
byte* cputs::str#6
void main()
constant byte* main::name = "Jesper"
constant byte* main::str[$d]  = "Hello, I am "
constant byte* main::str1[$f]  = ". who are you?"
void printf_string(byte* printf_string::str , byte printf_string::format_min_length , byte printf_string::format_justify_left)
struct printf_format_string printf_string::format
byte printf_string::format_justify_left
byte printf_string::format_justify_left#0
byte printf_string::format_min_length
byte printf_string::format_min_length#0
byte* printf_string::str
byte* printf_string::str#0
byte* printf_string::str#1
byte* screen
byte* screen#0
byte* screen#1
byte* screen#10
byte* screen#11
byte* screen#12
byte* screen#13
byte* screen#14
byte* screen#15
byte* screen#16
byte* screen#17
byte* screen#18
byte* screen#19
byte* screen#2
byte* screen#20
byte* screen#21
byte* screen#22
byte* screen#23
byte* screen#24
byte* screen#25
byte* screen#3
byte* screen#4
byte* screen#5
byte* screen#6
byte* screen#7
byte* screen#8
byte* screen#9

Adding number conversion cast (unumber) 0 in cputs::$0 = 0 != *cputs::str#4
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast 0
Simplifying constant pointer cast (byte*) 1024
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 0
Successful SSA optimization PassNFinalizeNumberTypeConversions
Alias cputs::str#4 = cputs::str#5 
Alias screen#1 = screen#11 screen#21 screen#12 
Alias screen#13 = screen#2 screen#14 screen#3 
Alias screen#15 = screen#4 
Alias screen#16 = screen#5 
Alias screen#17 = screen#6 screen#18 screen#7 
Alias screen#24 = screen#8 
Alias screen#10 = screen#9 screen#19 screen#20 
Successful SSA optimization Pass2AliasElimination
Identical Phi Values printf_string::str#1 printf_string::str#0
Identical Phi Values screen#22 screen#15
Identical Phi Values screen#13 screen#1
Identical Phi Values screen#23 screen#24
Identical Phi Values screen#15 screen#1
Identical Phi Values screen#16 screen#13
Identical Phi Values screen#17 screen#1
Identical Phi Values screen#10 screen#17
Successful SSA optimization Pass2IdenticalPhiElimination
Simple Condition cputs::$0 [3] if(0!=*cputs::str#4) goto cputs::@2
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant cputs::str#2 = main::str
Constant printf_string::str#0 = main::name
Constant printf_string::format_min_length#0 = 0
Constant printf_string::format_justify_left#0 = 0
Constant cputs::str#3 = main::str1
Constant screen#24 = (byte*) 1024
Successful SSA optimization Pass2ConstantIdentification
Constant cputs::str#1 = printf_string::str#0
Successful SSA optimization Pass2ConstantIdentification
Eliminating unused constant printf_string::format_min_length#0
Eliminating unused constant printf_string::format_justify_left#0
Successful SSA optimization PassNEliminateUnusedVars
Removing unused procedure __start
Removing unused procedure block __start
Removing unused procedure block __start::__init1
Removing unused procedure block __start::@1
Removing unused procedure block __start::@2
Removing unused procedure block __start::@return
Successful SSA optimization PassNEliminateEmptyStart
Inlining constant with var siblings cputs::str#2
Inlining constant with var siblings cputs::str#3
Inlining constant with var siblings cputs::str#1
Inlining constant with var siblings screen#24
Constant inlined cputs::str#1 = main::name
Constant inlined cputs::str#2 = main::str
Constant inlined cputs::str#3 = main::str1
Constant inlined screen#24 = (byte*) 1024
Constant inlined printf_string::str#0 = main::name
Successful SSA optimization Pass2ConstantInlining
Adding NOP phi() at start of main
Adding NOP phi() at start of main::@1
Adding NOP phi() at start of main::@3
Adding NOP phi() at start of printf_string::@1
CALL GRAPH
Calls in [main] to cputs:1 printf_string:3 cputs:5 
Calls in [printf_string] to cputs:20 

Created 4 initial phi equivalence classes
Coalesced [4] screen#26 = screen#1
Coalesced [9] cputs::str#7 = cputs::str#6
Coalesced (already) [10] screen#28 = screen#25
Coalesced [17] cputs::str#8 = cputs::str#0
Coalesced [18] screen#29 = screen#0
Coalesced (already) [19] screen#27 = screen#1
Coalesced down to 2 phi equivalence classes
Culled Empty Block label main::@3
Culled Empty Block label printf_string::@1
Adding NOP phi() at start of main
Adding NOP phi() at start of main::@1
Adding NOP phi() at start of main::@2
Adding NOP phi() at start of printf_string

FINAL CONTROL FLOW GRAPH

void main()
main: scope:[main]  from
  [0] phi()
  [1] call cputs 
  to:main::@1
main::@1: scope:[main]  from main
  [2] phi()
  [3] call printf_string 
  to:main::@2
main::@2: scope:[main]  from main::@1
  [4] phi()
  [5] call cputs 
  to:main::@return
main::@return: scope:[main]  from main::@2
  [6] return 
  to:@return

void cputs(byte* cputs::str)
cputs: scope:[cputs]  from main main::@2 printf_string
  [7] screen#25 = phi( main/(byte*) 1024, main::@2/screen#1, printf_string/screen#1 )
  [7] cputs::str#6 = phi( main/main::str, main::@2/main::str1, printf_string/main::name )
  to:cputs::@1
cputs::@1: scope:[cputs]  from cputs cputs::@2
  [8] screen#1 = phi( cputs/screen#25, cputs::@2/screen#0 )
  [8] cputs::str#4 = phi( cputs/cputs::str#6, cputs::@2/cputs::str#0 )
  [9] if(0!=*cputs::str#4) goto cputs::@2
  to:cputs::@return
cputs::@return: scope:[cputs]  from cputs::@1
  [10] return 
  to:@return
cputs::@2: scope:[cputs]  from cputs::@1
  [11] *screen#1 = *cputs::str#4
  [12] screen#0 = ++ screen#1
  [13] cputs::str#0 = ++ cputs::str#4
  to:cputs::@1

void printf_string(byte* printf_string::str , byte printf_string::format_min_length , byte printf_string::format_justify_left)
printf_string: scope:[printf_string]  from main::@1
  [14] phi()
  [15] call cputs 
  to:printf_string::@return
printf_string::@return: scope:[printf_string]  from printf_string
  [16] return 
  to:@return


VARIABLE REGISTER WEIGHTS
void cputs(byte* cputs::str)
byte* cputs::str
byte* cputs::str#0 2002.0
byte* cputs::str#4 1026.25
byte* cputs::str#6 101.0
void main()
void printf_string(byte* printf_string::str , byte printf_string::format_min_length , byte printf_string::format_justify_left)
struct printf_format_string printf_string::format
byte printf_string::format_justify_left
byte printf_string::format_min_length
byte* printf_string::str
byte* screen
byte* screen#0 1001.0
byte* screen#1 283.3636363636364
byte* screen#25 114.0

Initial phi equivalence classes
[ screen#25 screen#1 screen#0 ]
[ cputs::str#4 cputs::str#6 cputs::str#0 ]
Complete equivalence classes
[ screen#25 screen#1 screen#0 ]
[ cputs::str#4 cputs::str#6 cputs::str#0 ]
Allocated zp[2]:2 [ screen#25 screen#1 screen#0 ]
Allocated zp[2]:4 [ cputs::str#4 cputs::str#6 cputs::str#0 ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [9] if(0!=*cputs::str#4) goto cputs::@2 [ screen#1 cputs::str#4 ] ( cputs:1 [ screen#1 cputs::str#4 ] { }  cputs:5 [ screen#1 cputs::str#4 ] { { screen#1 = screen#25 } }  printf_string:3::cputs:15 [ screen#1 cputs::str#4 ] { { screen#1 = screen#25 } }  ) always clobbers reg byte a reg byte y 
Statement [11] *screen#1 = *cputs::str#4 [ screen#1 cputs::str#4 ] ( cputs:1 [ screen#1 cputs::str#4 ] { }  cputs:5 [ screen#1 cputs::str#4 ] { { screen#1 = screen#25 } }  printf_string:3::cputs:15 [ screen#1 cputs::str#4 ] { { screen#1 = screen#25 } }  ) always clobbers reg byte a reg byte y 
Potential registers zp[2]:2 [ screen#25 screen#1 screen#0 ] : zp[2]:2 , 
Potential registers zp[2]:4 [ cputs::str#4 cputs::str#6 cputs::str#0 ] : zp[2]:4 , 

REGISTER UPLIFT SCOPES
Uplift Scope [cputs] 3,129.25: zp[2]:4 [ cputs::str#4 cputs::str#6 cputs::str#0 ] 
Uplift Scope [] 1,398.36: zp[2]:2 [ screen#25 screen#1 screen#0 ] 
Uplift Scope [printf_format_string] 
Uplift Scope [printf_string] 
Uplift Scope [main] 

Uplifting [cputs] best 709 combination zp[2]:4 [ cputs::str#4 cputs::str#6 cputs::str#0 ] 
Uplifting [] best 709 combination zp[2]:2 [ screen#25 screen#1 screen#0 ] 
Uplifting [printf_format_string] best 709 combination 
Uplifting [printf_string] best 709 combination 
Uplifting [main] best 709 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Tests printf function call rewriting
// A simple string - with the printf-sub cuntions in the same file.
  // Upstart
  // Commodore 64 PRG executable file
.file [name="printf-10.prg", type="prg", segments="Program"]
.segmentdef Program [segments="Basic, Code, Data"]
.segmentdef Basic [start=$0801]
.segmentdef Code [start=$80d]
.segmentdef Data [startAfter="Code"]
.segment Basic
:BasicUpstart(main)
  // Global Constants & labels
  .label screen = 2
.segment Code
  // main
main: {
    // [1] call cputs 
    // [7] phi from main to cputs [phi:main->cputs]
  cputs_from_main:
    // [7] phi screen#25 = (byte*) 1024 [phi:main->cputs#0] -- pbuz1=pbuc1 
    lda #<$400
    sta.z screen
    lda #>$400
    sta.z screen+1
    // [7] phi cputs::str#6 = main::str [phi:main->cputs#1] -- pbuz1=pbuc1 
    lda #<str
    sta.z cputs.str
    lda #>str
    sta.z cputs.str+1
    jsr cputs
    // [2] phi from main to main::@1 [phi:main->main::@1]
  __b1_from_main:
    jmp __b1
    // main::@1
  __b1:
    // [3] call printf_string 
    // [14] phi from main::@1 to printf_string [phi:main::@1->printf_string]
  printf_string_from___b1:
    jsr printf_string
    // [4] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
  __b2_from___b1:
    jmp __b2
    // main::@2
  __b2:
    // [5] call cputs 
    // [7] phi from main::@2 to cputs [phi:main::@2->cputs]
  cputs_from___b2:
    // [7] phi screen#25 = screen#1 [phi:main::@2->cputs#0] -- register_copy 
    // [7] phi cputs::str#6 = main::str1 [phi:main::@2->cputs#1] -- pbuz1=pbuc1 
    lda #<str1
    sta.z cputs.str
    lda #>str1
    sta.z cputs.str+1
    jsr cputs
    jmp __breturn
    // main::@return
  __breturn:
    // [6] return 
    rts
  .segment Data
    name: .text "Jesper"
    .byte 0
    str: .text "Hello, I am "
    .byte 0
    str1: .text ". who are you?"
    .byte 0
}
.segment Code
  // cputs
// cputs(byte* zp(4) str)
cputs: {
    .label str = 4
    // [8] phi from cputs cputs::@2 to cputs::@1 [phi:cputs/cputs::@2->cputs::@1]
  __b1_from_cputs:
  __b1_from___b2:
    // [8] phi screen#1 = screen#25 [phi:cputs/cputs::@2->cputs::@1#0] -- register_copy 
    // [8] phi cputs::str#4 = cputs::str#6 [phi:cputs/cputs::@2->cputs::@1#1] -- register_copy 
    jmp __b1
    // cputs::@1
  __b1:
    // [9] if(0!=*cputs::str#4) goto cputs::@2 -- 0_neq__deref_pbuz1_then_la1 
    ldy #0
    lda (str),y
    cmp #0
    bne __b2
    jmp __breturn
    // cputs::@return
  __breturn:
    // [10] return 
    rts
    // cputs::@2
  __b2:
    // [11] *screen#1 = *cputs::str#4 -- _deref_pbuz1=_deref_pbuz2 
    ldy #0
    lda (str),y
    ldy #0
    sta (screen),y
    // [12] screen#0 = ++ screen#1 -- pbuz1=_inc_pbuz1 
    inc.z screen
    bne !+
    inc.z screen+1
  !:
    // [13] cputs::str#0 = ++ cputs::str#4 -- pbuz1=_inc_pbuz1 
    inc.z str
    bne !+
    inc.z str+1
  !:
    jmp __b1_from___b2
}
  // printf_string
// Print a string value using a specific format
// Handles justification and min length
printf_string: {
    // [15] call cputs 
    // [7] phi from printf_string to cputs [phi:printf_string->cputs]
  cputs_from_printf_string:
    // [7] phi screen#25 = screen#1 [phi:printf_string->cputs#0] -- register_copy 
    // [7] phi cputs::str#6 = main::name [phi:printf_string->cputs#1] -- pbuz1=pbuc1 
    lda #<main.name
    sta.z cputs.str
    lda #>main.name
    sta.z cputs.str+1
    jsr cputs
    jmp __breturn
    // printf_string::@return
  __breturn:
    // [16] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __b2
Removing instruction jmp __breturn
Removing instruction jmp __b1
Removing instruction jmp __breturn
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction ldy #0
Succesful ASM optimization Pass5UnnecesaryLoadElimination
Replacing label __b1_from___b2 with __b1
Removing instruction __b1_from_main:
Removing instruction printf_string_from___b1:
Removing instruction __b2_from___b1:
Removing instruction cputs_from___b2:
Removing instruction __b1_from_cputs:
Removing instruction __b1_from___b2:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction cputs_from_main:
Removing instruction __b1:
Removing instruction __b2:
Removing instruction __breturn:
Removing instruction __breturn:
Removing instruction cputs_from_printf_string:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
void cputs(byte* cputs::str)
byte* cputs::str
byte* cputs::str#0 str zp[2]:4 2002.0
byte* cputs::str#4 str zp[2]:4 1026.25
byte* cputs::str#6 str zp[2]:4 101.0
void main()
constant byte* main::name = "Jesper"
constant byte* main::str[$d]  = "Hello, I am "
constant byte* main::str1[$f]  = ". who are you?"
void printf_string(byte* printf_string::str , byte printf_string::format_min_length , byte printf_string::format_justify_left)
struct printf_format_string printf_string::format
byte printf_string::format_justify_left
byte printf_string::format_min_length
byte* printf_string::str
byte* screen
byte* screen#0 screen zp[2]:2 1001.0
byte* screen#1 screen zp[2]:2 283.3636363636364
byte* screen#25 screen zp[2]:2 114.0

zp[2]:2 [ screen#25 screen#1 screen#0 ]
zp[2]:4 [ cputs::str#4 cputs::str#6 cputs::str#0 ]


FINAL ASSEMBLER
Score: 617

  // File Comments
// Tests printf function call rewriting
// A simple string - with the printf-sub cuntions in the same file.
  // Upstart
  // Commodore 64 PRG executable file
.file [name="printf-10.prg", type="prg", segments="Program"]
.segmentdef Program [segments="Basic, Code, Data"]
.segmentdef Basic [start=$0801]
.segmentdef Code [start=$80d]
.segmentdef Data [startAfter="Code"]
.segment Basic
:BasicUpstart(main)
  // Global Constants & labels
  .label screen = 2
.segment Code
  // main
main: {
    // printf("Hello, I am %s. who are you?", name)
    // [1] call cputs 
    // [7] phi from main to cputs [phi:main->cputs]
    // [7] phi screen#25 = (byte*) 1024 [phi:main->cputs#0] -- pbuz1=pbuc1 
    lda #<$400
    sta.z screen
    lda #>$400
    sta.z screen+1
    // [7] phi cputs::str#6 = main::str [phi:main->cputs#1] -- pbuz1=pbuc1 
    lda #<str
    sta.z cputs.str
    lda #>str
    sta.z cputs.str+1
    jsr cputs
    // [2] phi from main to main::@1 [phi:main->main::@1]
    // main::@1
    // printf("Hello, I am %s. who are you?", name)
    // [3] call printf_string 
    // [14] phi from main::@1 to printf_string [phi:main::@1->printf_string]
    jsr printf_string
    // [4] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
    // main::@2
    // printf("Hello, I am %s. who are you?", name)
    // [5] call cputs 
    // [7] phi from main::@2 to cputs [phi:main::@2->cputs]
    // [7] phi screen#25 = screen#1 [phi:main::@2->cputs#0] -- register_copy 
    // [7] phi cputs::str#6 = main::str1 [phi:main::@2->cputs#1] -- pbuz1=pbuc1 
    lda #<str1
    sta.z cputs.str
    lda #>str1
    sta.z cputs.str+1
    jsr cputs
    // main::@return
    // }
    // [6] return 
    rts
  .segment Data
    name: .text "Jesper"
    .byte 0
    str: .text "Hello, I am "
    .byte 0
    str1: .text ". who are you?"
    .byte 0
}
.segment Code
  // cputs
// cputs(byte* zp(4) str)
cputs: {
    .label str = 4
    // [8] phi from cputs cputs::@2 to cputs::@1 [phi:cputs/cputs::@2->cputs::@1]
    // [8] phi screen#1 = screen#25 [phi:cputs/cputs::@2->cputs::@1#0] -- register_copy 
    // [8] phi cputs::str#4 = cputs::str#6 [phi:cputs/cputs::@2->cputs::@1#1] -- register_copy 
    // cputs::@1
  __b1:
    // while(*str)
    // [9] if(0!=*cputs::str#4) goto cputs::@2 -- 0_neq__deref_pbuz1_then_la1 
    ldy #0
    lda (str),y
    cmp #0
    bne __b2
    // cputs::@return
    // }
    // [10] return 
    rts
    // cputs::@2
  __b2:
    // *screen++ = *str++
    // [11] *screen#1 = *cputs::str#4 -- _deref_pbuz1=_deref_pbuz2 
    ldy #0
    lda (str),y
    sta (screen),y
    // *screen++ = *str++;
    // [12] screen#0 = ++ screen#1 -- pbuz1=_inc_pbuz1 
    inc.z screen
    bne !+
    inc.z screen+1
  !:
    // [13] cputs::str#0 = ++ cputs::str#4 -- pbuz1=_inc_pbuz1 
    inc.z str
    bne !+
    inc.z str+1
  !:
    jmp __b1
}
  // printf_string
// Print a string value using a specific format
// Handles justification and min length
printf_string: {
    // cputs(str)
    // [15] call cputs 
    // [7] phi from printf_string to cputs [phi:printf_string->cputs]
    // [7] phi screen#25 = screen#1 [phi:printf_string->cputs#0] -- register_copy 
    // [7] phi cputs::str#6 = main::name [phi:printf_string->cputs#1] -- pbuz1=pbuc1 
    lda #<main.name
    sta.z cputs.str
    lda #>main.name
    sta.z cputs.str+1
    jsr cputs
    // printf_string::@return
    // }
    // [16] return 
    rts
}
  // File Data