Identified constant variable (byte*) SCREEN
Culled Empty Block (label) main::@4
Culled Empty Block (label) @1
Culled Empty Block (label) @2

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  (byte*) SCREEN#0 ← ((byte*)) (number) $400
  to:@3
main: scope:[main]  from @3
  (byte) main::i#0 ← (byte) 0
  to:main::@1
main::@1: scope:[main]  from main main::@5
  (byte) main::i#2 ← phi( main/(byte) main::i#0 main::@5/(byte) main::i#1 )
  (byte) line::l#0 ← (byte) main::i#2
  call line 
  to:main::@5
main::@5: scope:[main]  from main::@1
  (byte) main::i#3 ← phi( main::@1/(byte) main::i#2 )
  (byte) main::i#1 ← (byte) main::i#3 + rangenext(0,8)
  (bool~) main::$1 ← (byte) main::i#1 != rangelast(0,8)
  if((bool~) main::$1) goto main::@1
  to:main::@2
main::@2: scope:[main]  from main::@5
  (byte) main::j#0 ← (byte) $a
  to:main::@3
main::@3: scope:[main]  from main::@2 main::@6
  (byte) main::j#2 ← phi( main::@2/(byte) main::j#0 main::@6/(byte) main::j#1 )
  (byte) line::l#1 ← (byte) main::j#2
  call line 
  to:main::@6
main::@6: scope:[main]  from main::@3
  (byte) main::j#3 ← phi( main::@3/(byte) main::j#2 )
  (byte) main::j#1 ← (byte) main::j#3 + rangenext($a,$12)
  (bool~) main::$3 ← (byte) main::j#1 != rangelast($a,$12)
  if((bool~) main::$3) goto main::@3
  to:main::@return
main::@return: scope:[main]  from main::@6
  return 
  to:@return
line: scope:[line]  from main::@1 main::@3
  (byte) line::l#2 ← phi( main::@1/(byte) line::l#0 main::@3/(byte) line::l#1 )
  (byte) plot::x#0 ← (byte) line::l#2
  call plot 
  to:line::@1
line::@1: scope:[line]  from line
  (byte) line::l#3 ← phi( line/(byte) line::l#2 )
  (number~) line::$1 ← (byte) line::l#3 + (number) $14
  (byte) plot::x#1 ← (number~) line::$1
  call plot 
  to:line::@2
line::@2: scope:[line]  from line::@1
  to:line::@return
line::@return: scope:[line]  from line::@2
  return 
  to:@return
plot: scope:[plot]  from line line::@1
  (byte) plot::x#2 ← phi( line/(byte) plot::x#0 line::@1/(byte) plot::x#1 )
  *((byte*) SCREEN#0 + (byte) plot::x#2) ← (byte) '*'
  to:plot::@return
plot::@return: scope:[plot]  from plot
  return 
  to:@return
@3: scope:[]  from @begin
  call main 
  to:@4
@4: scope:[]  from @3
  to:@end
@end: scope:[]  from @4

SYMBOL TABLE SSA
(label) @3
(label) @4
(label) @begin
(label) @end
(byte*) SCREEN
(byte*) SCREEN#0
(void()) line((byte) line::l)
(number~) line::$1
(label) line::@1
(label) line::@2
(label) line::@return
(byte) line::l
(byte) line::l#0
(byte) line::l#1
(byte) line::l#2
(byte) line::l#3
(void()) main()
(bool~) main::$1
(bool~) main::$3
(label) main::@1
(label) main::@2
(label) main::@3
(label) main::@5
(label) main::@6
(label) main::@return
(byte) main::i
(byte) main::i#0
(byte) main::i#1
(byte) main::i#2
(byte) main::i#3
(byte) main::j
(byte) main::j#0
(byte) main::j#1
(byte) main::j#2
(byte) main::j#3
(void()) plot((byte) plot::x)
(label) plot::@return
(byte) plot::x
(byte) plot::x#0
(byte) plot::x#1
(byte) plot::x#2

Adding number conversion cast (unumber) $14 in (number~) line::$1 ← (byte) line::l#3 + (number) $14
Adding number conversion cast (unumber) line::$1 in (number~) line::$1 ← (byte) line::l#3 + (unumber)(number) $14
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast (byte*) SCREEN#0 ← (byte*)(number) $400
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast $14
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) $14
Successful SSA optimization PassNFinalizeNumberTypeConversions
Inferred type updated to byte in (unumber~) line::$1 ← (byte) line::l#3 + (byte) $14
Alias (byte) main::i#2 = (byte) main::i#3 
Alias (byte) main::j#2 = (byte) main::j#3 
Alias (byte) line::l#2 = (byte) line::l#3 
Alias (byte) plot::x#1 = (byte~) line::$1 
Successful SSA optimization Pass2AliasElimination
Simple Condition (bool~) main::$1 [8] if((byte) main::i#1!=rangelast(0,8)) goto main::@1
Simple Condition (bool~) main::$3 [16] if((byte) main::j#1!=rangelast($a,$12)) goto main::@3
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const byte*) SCREEN#0 = (byte*) 1024
Constant (const byte) main::i#0 = 0
Constant (const byte) main::j#0 = $a
Successful SSA optimization Pass2ConstantIdentification
Resolved ranged next value [6] main::i#1 ← ++ main::i#2 to ++
Resolved ranged comparison value [8] if(main::i#1!=rangelast(0,8)) goto main::@1 to (number) 9
Resolved ranged next value [14] main::j#1 ← ++ main::j#2 to ++
Resolved ranged comparison value [16] if(main::j#1!=rangelast($a,$12)) goto main::@3 to (number) $13
Adding number conversion cast (unumber) 9 in if((byte) main::i#1!=(number) 9) goto main::@1
Adding number conversion cast (unumber) $13 in if((byte) main::j#1!=(number) $13) goto main::@3
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast 9
Simplifying constant integer cast $13
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 9
Finalized unsigned number type (byte) $13
Successful SSA optimization PassNFinalizeNumberTypeConversions
Inlining constant with var siblings (const byte) main::i#0
Inlining constant with var siblings (const byte) main::j#0
Constant inlined main::i#0 = (byte) 0
Constant inlined main::j#0 = (byte) $a
Successful SSA optimization Pass2ConstantInlining
Added new block during phi lifting main::@7(between main::@5 and main::@1)
Added new block during phi lifting main::@8(between main::@6 and main::@3)
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @3
Adding NOP phi() at start of @4
Adding NOP phi() at start of @end
Adding NOP phi() at start of main
Adding NOP phi() at start of main::@2
Adding NOP phi() at start of line::@2
CALL GRAPH
Calls in [] to main:2 
Calls in [main] to line:9 line:16 
Calls in [line] to plot:25 plot:28 

Created 4 initial phi equivalence classes
Coalesced [8] line::l#4 ← line::l#0
Coalesced [15] line::l#5 ← line::l#1
Coalesced [20] main::j#4 ← main::j#1
Coalesced [21] main::i#4 ← main::i#1
Coalesced [24] plot::x#3 ← plot::x#0
Coalesced [27] plot::x#4 ← plot::x#1
Coalesced down to 4 phi equivalence classes
Culled Empty Block (label) @4
Culled Empty Block (label) main::@2
Culled Empty Block (label) main::@8
Culled Empty Block (label) main::@7
Culled Empty Block (label) line::@2
Renumbering block @3 to @1
Renumbering block main::@3 to main::@2
Renumbering block main::@5 to main::@3
Renumbering block main::@6 to main::@4
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @end
Adding NOP phi() at start of main

FINAL CONTROL FLOW GRAPH
@begin: scope:[]  from
  [0] phi()
  to:@1
@1: scope:[]  from @begin
  [1] phi()
  [2] call main 
  to:@end
@end: scope:[]  from @1
  [3] phi()
main: scope:[main]  from @1
  [4] phi()
  to:main::@1
main::@1: scope:[main]  from main main::@3
  [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@3/(byte) main::i#1 )
  [6] (byte) line::l#0 ← (byte) main::i#2
  [7] call line 
  to:main::@3
main::@3: scope:[main]  from main::@1
  [8] (byte) main::i#1 ← ++ (byte) main::i#2
  [9] if((byte) main::i#1!=(byte) 9) goto main::@1
  to:main::@2
main::@2: scope:[main]  from main::@3 main::@4
  [10] (byte) main::j#2 ← phi( main::@3/(byte) $a main::@4/(byte) main::j#1 )
  [11] (byte) line::l#1 ← (byte) main::j#2
  [12] call line 
  to:main::@4
main::@4: scope:[main]  from main::@2
  [13] (byte) main::j#1 ← ++ (byte) main::j#2
  [14] if((byte) main::j#1!=(byte) $13) goto main::@2
  to:main::@return
main::@return: scope:[main]  from main::@4
  [15] return 
  to:@return
line: scope:[line]  from main::@1 main::@2
  [16] (byte) line::l#2 ← phi( main::@1/(byte) line::l#0 main::@2/(byte) line::l#1 )
  [17] (byte) plot::x#0 ← (byte) line::l#2
  [18] call plot 
  to:line::@1
line::@1: scope:[line]  from line
  [19] (byte) plot::x#1 ← (byte) line::l#2 + (byte) $14
  [20] call plot 
  to:line::@return
line::@return: scope:[line]  from line::@1
  [21] return 
  to:@return
plot: scope:[plot]  from line line::@1
  [22] (byte) plot::x#2 ← phi( line/(byte) plot::x#0 line::@1/(byte) plot::x#1 )
  [23] *((const byte*) SCREEN#0 + (byte) plot::x#2) ← (byte) '*'
  to:plot::@return
plot::@return: scope:[plot]  from plot
  [24] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(byte*) SCREEN
(void()) line((byte) line::l)
(byte) line::l
(byte) line::l#0 22.0
(byte) line::l#1 22.0
(byte) line::l#2 8.666666666666666
(void()) main()
(byte) main::i
(byte) main::i#1 16.5
(byte) main::i#2 11.0
(byte) main::j
(byte) main::j#1 16.5
(byte) main::j#2 11.0
(void()) plot((byte) plot::x)
(byte) plot::x
(byte) plot::x#0 4.0
(byte) plot::x#1 4.0
(byte) plot::x#2 6.0

Initial phi equivalence classes
[ main::i#2 main::i#1 ]
[ main::j#2 main::j#1 ]
[ line::l#2 line::l#0 line::l#1 ]
[ plot::x#2 plot::x#0 plot::x#1 ]
Complete equivalence classes
[ main::i#2 main::i#1 ]
[ main::j#2 main::j#1 ]
[ line::l#2 line::l#0 line::l#1 ]
[ plot::x#2 plot::x#0 plot::x#1 ]
Allocated zp ZP_BYTE:2 [ main::i#2 main::i#1 ]
Allocated zp ZP_BYTE:3 [ main::j#2 main::j#1 ]
Allocated zp ZP_BYTE:4 [ line::l#2 line::l#0 line::l#1 ]
Allocated zp ZP_BYTE:5 [ plot::x#2 plot::x#0 plot::x#1 ]

INITIAL ASM
Target platform is c64basic
  // File Comments
// Two levels of functions to test that register allocation handles live ranges and call-ranges optimally to allocate the fewest possible ZP-variables
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  // @begin
bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
  // @1
b1:
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
main_from_b1:
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
  // @end
bend:
  // main
main: {
    .label i = 2
    .label j = 3
    // [5] phi from main to main::@1 [phi:main->main::@1]
  b1_from_main:
    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuz1=vbuc1 
    lda #0
    sta.z i
    jmp b1
    // [5] phi from main::@3 to main::@1 [phi:main::@3->main::@1]
  b1_from_b3:
    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@3->main::@1#0] -- register_copy 
    jmp b1
    // main::@1
  b1:
    // [6] (byte) line::l#0 ← (byte) main::i#2 -- vbuz1=vbuz2 
    lda.z i
    sta.z line.l
    // [7] call line 
    // [16] phi from main::@1 to line [phi:main::@1->line]
  line_from_b1:
    // [16] phi (byte) line::l#2 = (byte) line::l#0 [phi:main::@1->line#0] -- register_copy 
    jsr line
    jmp b3
    // main::@3
  b3:
    // [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuz1=_inc_vbuz1 
    inc.z i
    // [9] if((byte) main::i#1!=(byte) 9) goto main::@1 -- vbuz1_neq_vbuc1_then_la1 
    lda #9
    cmp.z i
    bne b1_from_b3
    // [10] phi from main::@3 to main::@2 [phi:main::@3->main::@2]
  b2_from_b3:
    // [10] phi (byte) main::j#2 = (byte) $a [phi:main::@3->main::@2#0] -- vbuz1=vbuc1 
    lda #$a
    sta.z j
    jmp b2
    // [10] phi from main::@4 to main::@2 [phi:main::@4->main::@2]
  b2_from_b4:
    // [10] phi (byte) main::j#2 = (byte) main::j#1 [phi:main::@4->main::@2#0] -- register_copy 
    jmp b2
    // main::@2
  b2:
    // [11] (byte) line::l#1 ← (byte) main::j#2 -- vbuz1=vbuz2 
    lda.z j
    sta.z line.l
    // [12] call line 
    // [16] phi from main::@2 to line [phi:main::@2->line]
  line_from_b2:
    // [16] phi (byte) line::l#2 = (byte) line::l#1 [phi:main::@2->line#0] -- register_copy 
    jsr line
    jmp b4
    // main::@4
  b4:
    // [13] (byte) main::j#1 ← ++ (byte) main::j#2 -- vbuz1=_inc_vbuz1 
    inc.z j
    // [14] if((byte) main::j#1!=(byte) $13) goto main::@2 -- vbuz1_neq_vbuc1_then_la1 
    lda #$13
    cmp.z j
    bne b2_from_b4
    jmp breturn
    // main::@return
  breturn:
    // [15] return 
    rts
}
  // line
// line(byte zeropage(4) l)
line: {
    .label l = 4
    // [17] (byte) plot::x#0 ← (byte) line::l#2 -- vbuz1=vbuz2 
    lda.z l
    sta.z plot.x
    // [18] call plot 
    // [22] phi from line to plot [phi:line->plot]
  plot_from_line:
    // [22] phi (byte) plot::x#2 = (byte) plot::x#0 [phi:line->plot#0] -- register_copy 
    jsr plot
    jmp b1
    // line::@1
  b1:
    // [19] (byte) plot::x#1 ← (byte) line::l#2 + (byte) $14 -- vbuz1=vbuz2_plus_vbuc1 
    lax.z l
    axs #-[$14]
    stx.z plot.x
    // [20] call plot 
    // [22] phi from line::@1 to plot [phi:line::@1->plot]
  plot_from_b1:
    // [22] phi (byte) plot::x#2 = (byte) plot::x#1 [phi:line::@1->plot#0] -- register_copy 
    jsr plot
    jmp breturn
    // line::@return
  breturn:
    // [21] return 
    rts
}
  // plot
// plot(byte zeropage(5) x)
plot: {
    .label x = 5
    // [23] *((const byte*) SCREEN#0 + (byte) plot::x#2) ← (byte) '*' -- pbuc1_derefidx_vbuz1=vbuc2 
    lda #'*'
    ldy.z x
    sta SCREEN,y
    jmp breturn
    // plot::@return
  breturn:
    // [24] return 
    rts
}
  // File Data

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [23] *((const byte*) SCREEN#0 + (byte) plot::x#2) ← (byte) '*' [ ] ( main:2::line:7::plot:18 [ main::i#2 line::l#2 ] main:2::line:12::plot:18 [ main::j#2 line::l#2 ] main:2::line:7::plot:20 [ main::i#2 ] main:2::line:12::plot:20 [ main::j#2 ] ) always clobbers reg byte a 
Removing always clobbered register reg byte a as potential for zp ZP_BYTE:2 [ main::i#2 main::i#1 ]
Removing always clobbered register reg byte a as potential for zp ZP_BYTE:4 [ line::l#2 line::l#0 line::l#1 ]
Removing always clobbered register reg byte a as potential for zp ZP_BYTE:3 [ main::j#2 main::j#1 ]
Statement [19] (byte) plot::x#1 ← (byte) line::l#2 + (byte) $14 [ plot::x#1 ] ( main:2::line:7 [ main::i#2 plot::x#1 ] main:2::line:12 [ main::j#2 plot::x#1 ] ) always clobbers reg byte a 
Statement [23] *((const byte*) SCREEN#0 + (byte) plot::x#2) ← (byte) '*' [ ] ( main:2::line:7::plot:18 [ main::i#2 line::l#2 ] main:2::line:12::plot:18 [ main::j#2 line::l#2 ] main:2::line:7::plot:20 [ main::i#2 ] main:2::line:12::plot:20 [ main::j#2 ] ) always clobbers reg byte a 
Potential registers zp ZP_BYTE:2 [ main::i#2 main::i#1 ] : zp ZP_BYTE:2 , reg byte x , reg byte y , 
Potential registers zp ZP_BYTE:3 [ main::j#2 main::j#1 ] : zp ZP_BYTE:3 , reg byte x , reg byte y , 
Potential registers zp ZP_BYTE:4 [ line::l#2 line::l#0 line::l#1 ] : zp ZP_BYTE:4 , reg byte x , reg byte y , 
Potential registers zp ZP_BYTE:5 [ plot::x#2 plot::x#0 plot::x#1 ] : zp ZP_BYTE:5 , reg byte a , reg byte x , reg byte y , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 27.5: zp ZP_BYTE:2 [ main::i#2 main::i#1 ] 27.5: zp ZP_BYTE:3 [ main::j#2 main::j#1 ] 
Uplift Scope [line] 52.67: zp ZP_BYTE:4 [ line::l#2 line::l#0 line::l#1 ] 
Uplift Scope [plot] 14: zp ZP_BYTE:5 [ plot::x#2 plot::x#0 plot::x#1 ] 
Uplift Scope [] 

Uplifting [main] best 713 combination zp ZP_BYTE:2 [ main::i#2 main::i#1 ] zp ZP_BYTE:3 [ main::j#2 main::j#1 ] 
Uplifting [line] best 649 combination reg byte x [ line::l#2 line::l#0 line::l#1 ] 
Uplifting [plot] best 640 combination reg byte x [ plot::x#2 plot::x#0 plot::x#1 ] 
Uplifting [] best 640 combination 
Attempting to uplift remaining variables inzp ZP_BYTE:2 [ main::i#2 main::i#1 ]
Uplifting [main] best 560 combination reg byte y [ main::i#2 main::i#1 ] 
Attempting to uplift remaining variables inzp ZP_BYTE:3 [ main::j#2 main::j#1 ]
Uplifting [main] best 480 combination reg byte y [ main::j#2 main::j#1 ] 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Two levels of functions to test that register allocation handles live ranges and call-ranges optimally to allocate the fewest possible ZP-variables
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  // @begin
bbegin:
  // [1] phi from @begin to @1 [phi:@begin->@1]
b1_from_bbegin:
  jmp b1
  // @1
b1:
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
main_from_b1:
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
bend_from_b1:
  jmp bend
  // @end
bend:
  // main
main: {
    // [5] phi from main to main::@1 [phi:main->main::@1]
  b1_from_main:
    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
    ldy #0
    jmp b1
    // [5] phi from main::@3 to main::@1 [phi:main::@3->main::@1]
  b1_from_b3:
    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@3->main::@1#0] -- register_copy 
    jmp b1
    // main::@1
  b1:
    // [6] (byte) line::l#0 ← (byte) main::i#2 -- vbuxx=vbuyy 
    tya
    tax
    // [7] call line 
    // [16] phi from main::@1 to line [phi:main::@1->line]
  line_from_b1:
    // [16] phi (byte) line::l#2 = (byte) line::l#0 [phi:main::@1->line#0] -- register_copy 
    jsr line
    jmp b3
    // main::@3
  b3:
    // [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuyy=_inc_vbuyy 
    iny
    // [9] if((byte) main::i#1!=(byte) 9) goto main::@1 -- vbuyy_neq_vbuc1_then_la1 
    cpy #9
    bne b1_from_b3
    // [10] phi from main::@3 to main::@2 [phi:main::@3->main::@2]
  b2_from_b3:
    // [10] phi (byte) main::j#2 = (byte) $a [phi:main::@3->main::@2#0] -- vbuyy=vbuc1 
    ldy #$a
    jmp b2
    // [10] phi from main::@4 to main::@2 [phi:main::@4->main::@2]
  b2_from_b4:
    // [10] phi (byte) main::j#2 = (byte) main::j#1 [phi:main::@4->main::@2#0] -- register_copy 
    jmp b2
    // main::@2
  b2:
    // [11] (byte) line::l#1 ← (byte) main::j#2 -- vbuxx=vbuyy 
    tya
    tax
    // [12] call line 
    // [16] phi from main::@2 to line [phi:main::@2->line]
  line_from_b2:
    // [16] phi (byte) line::l#2 = (byte) line::l#1 [phi:main::@2->line#0] -- register_copy 
    jsr line
    jmp b4
    // main::@4
  b4:
    // [13] (byte) main::j#1 ← ++ (byte) main::j#2 -- vbuyy=_inc_vbuyy 
    iny
    // [14] if((byte) main::j#1!=(byte) $13) goto main::@2 -- vbuyy_neq_vbuc1_then_la1 
    cpy #$13
    bne b2_from_b4
    jmp breturn
    // main::@return
  breturn:
    // [15] return 
    rts
}
  // line
// line(byte register(X) l)
line: {
    // [17] (byte) plot::x#0 ← (byte) line::l#2
    // [18] call plot 
    // [22] phi from line to plot [phi:line->plot]
  plot_from_line:
    // [22] phi (byte) plot::x#2 = (byte) plot::x#0 [phi:line->plot#0] -- register_copy 
    jsr plot
    jmp b1
    // line::@1
  b1:
    // [19] (byte) plot::x#1 ← (byte) line::l#2 + (byte) $14 -- vbuxx=vbuxx_plus_vbuc1 
    txa
    axs #-[$14]
    // [20] call plot 
    // [22] phi from line::@1 to plot [phi:line::@1->plot]
  plot_from_b1:
    // [22] phi (byte) plot::x#2 = (byte) plot::x#1 [phi:line::@1->plot#0] -- register_copy 
    jsr plot
    jmp breturn
    // line::@return
  breturn:
    // [21] return 
    rts
}
  // plot
// plot(byte register(X) x)
plot: {
    // [23] *((const byte*) SCREEN#0 + (byte) plot::x#2) ← (byte) '*' -- pbuc1_derefidx_vbuxx=vbuc2 
    lda #'*'
    sta SCREEN,x
    jmp breturn
    // plot::@return
  breturn:
    // [24] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp b1
Removing instruction jmp bend
Removing instruction jmp b1
Removing instruction jmp b3
Removing instruction jmp b2
Removing instruction jmp b4
Removing instruction jmp breturn
Removing instruction jmp b1
Removing instruction jmp breturn
Removing instruction jmp breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label b1_from_b3 with b1
Replacing label b2_from_b4 with b2
Removing instruction b1_from_bbegin:
Removing instruction b1:
Removing instruction main_from_b1:
Removing instruction bend_from_b1:
Removing instruction b1_from_b3:
Removing instruction b2_from_b4:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction bend:
Removing instruction b1_from_main:
Removing instruction line_from_b1:
Removing instruction b3:
Removing instruction b2_from_b3:
Removing instruction line_from_b2:
Removing instruction b4:
Removing instruction breturn:
Removing instruction plot_from_line:
Removing instruction b1:
Removing instruction plot_from_b1:
Removing instruction breturn:
Removing instruction breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Updating BasicUpstart to call main directly
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Removing instruction jmp b1
Removing instruction jmp b2
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction bbegin:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(byte*) SCREEN
(const byte*) SCREEN#0 SCREEN = (byte*) 1024
(void()) line((byte) line::l)
(label) line::@1
(label) line::@return
(byte) line::l
(byte) line::l#0 reg byte x 22.0
(byte) line::l#1 reg byte x 22.0
(byte) line::l#2 reg byte x 8.666666666666666
(void()) main()
(label) main::@1
(label) main::@2
(label) main::@3
(label) main::@4
(label) main::@return
(byte) main::i
(byte) main::i#1 reg byte y 16.5
(byte) main::i#2 reg byte y 11.0
(byte) main::j
(byte) main::j#1 reg byte y 16.5
(byte) main::j#2 reg byte y 11.0
(void()) plot((byte) plot::x)
(label) plot::@return
(byte) plot::x
(byte) plot::x#0 reg byte x 4.0
(byte) plot::x#1 reg byte x 4.0
(byte) plot::x#2 reg byte x 6.0

reg byte y [ main::i#2 main::i#1 ]
reg byte y [ main::j#2 main::j#1 ]
reg byte x [ line::l#2 line::l#0 line::l#1 ]
reg byte x [ plot::x#2 plot::x#0 plot::x#1 ]


FINAL ASSEMBLER
Score: 303

  // File Comments
// Two levels of functions to test that register allocation handles live ranges and call-ranges optimally to allocate the fewest possible ZP-variables
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .label SCREEN = $400
  // @begin
  // [1] phi from @begin to @1 [phi:@begin->@1]
  // @1
  // [2] call main 
  // [4] phi from @1 to main [phi:@1->main]
  // [3] phi from @1 to @end [phi:@1->@end]
  // @end
  // main
main: {
    // [5] phi from main to main::@1 [phi:main->main::@1]
    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
    ldy #0
    // [5] phi from main::@3 to main::@1 [phi:main::@3->main::@1]
    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@3->main::@1#0] -- register_copy 
    // main::@1
  b1:
    // line(i)
    // [6] (byte) line::l#0 ← (byte) main::i#2 -- vbuxx=vbuyy 
    tya
    tax
    // [7] call line 
    // [16] phi from main::@1 to line [phi:main::@1->line]
    // [16] phi (byte) line::l#2 = (byte) line::l#0 [phi:main::@1->line#0] -- register_copy 
    jsr line
    // main::@3
    // for(byte i : 0..8)
    // [8] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuyy=_inc_vbuyy 
    iny
    // [9] if((byte) main::i#1!=(byte) 9) goto main::@1 -- vbuyy_neq_vbuc1_then_la1 
    cpy #9
    bne b1
    // [10] phi from main::@3 to main::@2 [phi:main::@3->main::@2]
    // [10] phi (byte) main::j#2 = (byte) $a [phi:main::@3->main::@2#0] -- vbuyy=vbuc1 
    ldy #$a
    // [10] phi from main::@4 to main::@2 [phi:main::@4->main::@2]
    // [10] phi (byte) main::j#2 = (byte) main::j#1 [phi:main::@4->main::@2#0] -- register_copy 
    // main::@2
  b2:
    // line(j)
    // [11] (byte) line::l#1 ← (byte) main::j#2 -- vbuxx=vbuyy 
    tya
    tax
    // [12] call line 
    // [16] phi from main::@2 to line [phi:main::@2->line]
    // [16] phi (byte) line::l#2 = (byte) line::l#1 [phi:main::@2->line#0] -- register_copy 
    jsr line
    // main::@4
    // for(byte j : 10..18)
    // [13] (byte) main::j#1 ← ++ (byte) main::j#2 -- vbuyy=_inc_vbuyy 
    iny
    // [14] if((byte) main::j#1!=(byte) $13) goto main::@2 -- vbuyy_neq_vbuc1_then_la1 
    cpy #$13
    bne b2
    // main::@return
    // }
    // [15] return 
    rts
}
  // line
// line(byte register(X) l)
line: {
    // plot(l)
    // [17] (byte) plot::x#0 ← (byte) line::l#2
    // [18] call plot 
    // [22] phi from line to plot [phi:line->plot]
    // [22] phi (byte) plot::x#2 = (byte) plot::x#0 [phi:line->plot#0] -- register_copy 
    jsr plot
    // line::@1
    // plot(l+20)
    // [19] (byte) plot::x#1 ← (byte) line::l#2 + (byte) $14 -- vbuxx=vbuxx_plus_vbuc1 
    txa
    axs #-[$14]
    // [20] call plot 
    // [22] phi from line::@1 to plot [phi:line::@1->plot]
    // [22] phi (byte) plot::x#2 = (byte) plot::x#1 [phi:line::@1->plot#0] -- register_copy 
    jsr plot
    // line::@return
    // }
    // [21] return 
    rts
}
  // plot
// plot(byte register(X) x)
plot: {
    // SCREEN[x] = '*'
    // [23] *((const byte*) SCREEN#0 + (byte) plot::x#2) ← (byte) '*' -- pbuc1_derefidx_vbuxx=vbuc2 
    lda #'*'
    sta SCREEN,x
    // plot::@return
    // }
    // [24] return 
    rts
}
  // File Data

