Setting inferred volatile on symbol affected by address-of: print::ch in asm { ldxidx ldach staSCREEN,x incidx  }
Inlined call call __init 

CONTROL FLOW GRAPH SSA

void main()
main: scope:[main]  from __start::@1
  print::ch = 'c'
  call print 
  to:main::@1
main::@1: scope:[main]  from main
  print::ch = 'm'
  call print 
  to:main::@2
main::@2: scope:[main]  from main::@1
  print::ch = 'l'
  call print 
  to:main::@3
main::@3: scope:[main]  from main::@2
  to:main::@return
main::@return: scope:[main]  from main::@3
  return 
  to:@return

void print(volatile byte print::ch)
print: scope:[print]  from main main::@1 main::@2
  asm { ldxidx ldach staSCREEN,x incidx  }
  to:print::@return
print::@return: scope:[print]  from print
  return 
  to:@return

void __start()
__start: scope:[__start]  from
  to:__start::__init1
__start::__init1: scope:[__start]  from __start
  idx = 0
  to:__start::@1
__start::@1: scope:[__start]  from __start::__init1
  call main 
  to:__start::@2
__start::@2: scope:[__start]  from __start::@1
  to:__start::@return
__start::@return: scope:[__start]  from __start::@2
  return 
  to:@return

SYMBOL TABLE SSA
const nomodify byte* SCREEN = (byte*)$400
void __start()
volatile byte idx loadstore !zp[-1]:3
void main()
void print(volatile byte print::ch)
volatile byte print::ch loadstore !zp[-1]:2

Simplifying constant pointer cast (byte*) 1024
Successful SSA optimization PassNCastSimplification
Adding NOP phi() at start of __start
Adding NOP phi() at start of __start::@1
Adding NOP phi() at start of __start::@2
Adding NOP phi() at start of main::@3
CALL GRAPH
Calls in [__start] to main:3 
Calls in [main] to print:7 print:9 print:11 

Created 0 initial phi equivalence classes
Coalesced down to 0 phi equivalence classes
Culled Empty Block label __start::@2
Culled Empty Block label main::@3
Adding NOP phi() at start of __start
Adding NOP phi() at start of __start::@1

FINAL CONTROL FLOW GRAPH

void __start()
__start: scope:[__start]  from
  [0] phi()
  to:__start::__init1
__start::__init1: scope:[__start]  from __start
  [1] idx = 0
  to:__start::@1
__start::@1: scope:[__start]  from __start::__init1
  [2] phi()
  [3] call main 
  to:__start::@return
__start::@return: scope:[__start]  from __start::@1
  [4] return 
  to:@return

void main()
main: scope:[main]  from __start::@1
  [5] print::ch = 'c'
  [6] call print 
  to:main::@1
main::@1: scope:[main]  from main
  [7] print::ch = 'm'
  [8] call print 
  to:main::@2
main::@2: scope:[main]  from main::@1
  [9] print::ch = 'l'
  [10] call print 
  to:main::@return
main::@return: scope:[main]  from main::@2
  [11] return 
  to:@return

void print(volatile byte print::ch)
print: scope:[print]  from main main::@1 main::@2
  asm { ldxidx ldach staSCREEN,x incidx  }
  to:print::@return
print::@return: scope:[print]  from print
  [13] return 
  to:@return


VARIABLE REGISTER WEIGHTS
void __start()
volatile byte idx loadstore !zp[-1]:3 0.2222222222222222
void main()
void print(volatile byte print::ch)
volatile byte print::ch loadstore !zp[-1]:2 11.0

Initial phi equivalence classes
Added variable idx to live range equivalence class [ idx ]
Added variable print::ch to live range equivalence class [ print::ch ]
Complete equivalence classes
[ idx ]
[ print::ch ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [1] idx = 0 [ idx ] (  [ idx ] { }  ) always clobbers reg byte a 
Statement [5] print::ch = 'c' [ idx print::ch ] ( main:3 [ idx print::ch ] { }  ) always clobbers reg byte a 
Statement [7] print::ch = 'm' [ idx print::ch ] ( main:3 [ idx print::ch ] { }  ) always clobbers reg byte a 
Statement [9] print::ch = 'l' [ idx print::ch ] ( main:3 [ idx print::ch ] { }  ) always clobbers reg byte a 
Statement asm { ldxidx ldach staSCREEN,x incidx  } always clobbers reg byte a reg byte x 
Potential registers zp[1]:3 [ idx ] : zp[1]:3 , 
Potential registers zp[1]:2 [ print::ch ] : zp[1]:2 , 

REGISTER UPLIFT SCOPES
Uplift Scope [print] 11: zp[1]:2 [ print::ch ] 
Uplift Scope [] 0.22: zp[1]:3 [ idx ] 
Uplift Scope [main] 
Uplift Scope [__start] 

Uplifting [print] best 129 combination zp[1]:2 [ print::ch ] 
Uplifting [] best 129 combination zp[1]:3 [ idx ] 
Uplifting [main] best 129 combination 
Uplifting [__start] best 129 combination 
Attempting to uplift remaining variables inzp[1]:2 [ print::ch ]
Uplifting [print] best 129 combination zp[1]:2 [ print::ch ] 
Attempting to uplift remaining variables inzp[1]:3 [ idx ]
Uplifting [] best 129 combination zp[1]:3 [ idx ] 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Test declaring a variable as at a hard-coded address
// zero-page hard-coded address parameter
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(__start)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  .label idx = 3
  // __start
__start: {
    jmp __init1
    // __start::__init1
  __init1:
    // [1] idx = 0 -- vbuz1=vbuc1 
    lda #0
    sta.z idx
    // [2] phi from __start::__init1 to __start::@1 [phi:__start::__init1->__start::@1]
  __b1_from___init1:
    jmp __b1
    // __start::@1
  __b1:
    // [3] call main 
    jsr main
    jmp __breturn
    // __start::@return
  __breturn:
    // [4] return 
    rts
}
  // main
main: {
    // [5] print::ch = 'c' -- vbuz1=vbuc1 
    lda #'c'
    sta.z print.ch
    // [6] call print 
    jsr print
    jmp __b1
    // main::@1
  __b1:
    // [7] print::ch = 'm' -- vbuz1=vbuc1 
    lda #'m'
    sta.z print.ch
    // [8] call print 
    jsr print
    jmp __b2
    // main::@2
  __b2:
    // [9] print::ch = 'l' -- vbuz1=vbuc1 
    lda #'l'
    sta.z print.ch
    // [10] call print 
    jsr print
    jmp __breturn
    // main::@return
  __breturn:
    // [11] return 
    rts
}
  // print
// print(byte zp(2) ch)
print: {
    .label ch = 2
    // asm { ldxidx ldach staSCREEN,x incidx  }
    ldx idx
    lda ch
    sta SCREEN,x
    inc idx
    jmp __breturn
    // print::@return
  __breturn:
    // [13] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __init1
Removing instruction jmp __b1
Removing instruction jmp __breturn
Removing instruction jmp __b1
Removing instruction jmp __b2
Removing instruction jmp __breturn
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction __b1_from___init1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __init1:
Removing instruction __b1:
Removing instruction __breturn:
Removing instruction __b1:
Removing instruction __b2:
Removing instruction __breturn:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
const nomodify byte* SCREEN = (byte*) 1024
void __start()
volatile byte idx loadstore !zp[-1]:3 zp[1]:3 0.2222222222222222
void main()
void print(volatile byte print::ch)
volatile byte print::ch loadstore !zp[-1]:2 zp[1]:2 11.0

zp[1]:3 [ idx ]
zp[1]:2 [ print::ch ]


FINAL ASSEMBLER
Score: 81

  // File Comments
// Test declaring a variable as at a hard-coded address
// zero-page hard-coded address parameter
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(__start)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  .label idx = 3
  // __start
__start: {
    // __start::__init1
    // idx
    // [1] idx = 0 -- vbuz1=vbuc1 
    lda #0
    sta.z idx
    // [2] phi from __start::__init1 to __start::@1 [phi:__start::__init1->__start::@1]
    // __start::@1
    // [3] call main 
    jsr main
    // __start::@return
    // [4] return 
    rts
}
  // main
main: {
    // print('c')
    // [5] print::ch = 'c' -- vbuz1=vbuc1 
    lda #'c'
    sta.z print.ch
    // [6] call print 
    jsr print
    // main::@1
    // print('m')
    // [7] print::ch = 'm' -- vbuz1=vbuc1 
    lda #'m'
    sta.z print.ch
    // [8] call print 
    jsr print
    // main::@2
    // print('l')
    // [9] print::ch = 'l' -- vbuz1=vbuc1 
    lda #'l'
    sta.z print.ch
    // [10] call print 
    jsr print
    // main::@return
    // }
    // [11] return 
    rts
}
  // print
// print(byte zp(2) ch)
print: {
    .label ch = 2
    // asm
    // asm { ldxidx ldach staSCREEN,x incidx  }
    ldx idx
    lda ch
    sta SCREEN,x
    inc idx
    // print::@return
    // }
    // [13] return 
    rts
}
  // File Data