Identified constant variable (byte*) SCREEN

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  to:@1

(void()) main()
main: scope:[main]  from @1
  *((const byte*) SCREEN + (number) 0) ← (byte) 'x'
  to:main::@return
main::@return: scope:[main]  from main
  return 
  to:@return
@1: scope:[]  from @begin
  call main 
  to:@2
@2: scope:[]  from @1
  to:@end
@end: scope:[]  from @2

SYMBOL TABLE SSA
(label) @1
(label) @2
(label) @begin
(label) @end
(const byte*) MESSAGE[]  = (byte*) "camelot!"
(const byte*) SCREEN = (byte*)(number) $400
(void()) main()
(label) main::@return

Adding number conversion cast (unumber) 0 in *((const byte*) SCREEN + (number) 0) ← (byte) 'x'
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast 0
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 0
Successful SSA optimization PassNFinalizeNumberTypeConversions
Simplifying expression containing zero SCREEN in [0] *((const byte*) SCREEN + (byte) 0) ← (byte) 'x'
Successful SSA optimization PassNSimplifyExpressionWithZero
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @2
Adding NOP phi() at start of @end
CALL GRAPH
Calls in [] to main:2 

Created 0 initial phi equivalence classes
Coalesced down to 0 phi equivalence classes
Culled Empty Block (label) @2
Adding NOP phi() at start of @begin
Adding NOP phi() at start of @1
Adding NOP phi() at start of @end

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()

(void()) main()
main: scope:[main]  from @1
  [4] *((const byte*) SCREEN) ← (byte) 'x'
  to:main::@return
main::@return: scope:[main]  from main
  [5] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(void()) main()

Initial phi equivalence classes
Complete equivalence classes

INITIAL ASM
Target platform is c64basic / MOS6502X
  // File Comments
// Test the export directive usable for ensuring a data variable is always added to the output - even if it is never used
  // 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 
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
__bend_from___b1:
  jmp __bend
  // @end
__bend:
  // main
main: {
    // [4] *((const byte*) SCREEN) ← (byte) 'x' -- _deref_pbuc1=vbuc2 
    lda #'x'
    sta SCREEN
    jmp __breturn
    // main::@return
  __breturn:
    // [5] return 
    rts
}
  // File Data
  MESSAGE: .text "camelot!"
  .byte 0

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [4] *((const byte*) SCREEN) ← (byte) 'x' [ ] ( main:2 [ ] ) always clobbers reg byte a 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 
Uplift Scope [] 

Uplifting [main] best 27 combination 
Uplifting [] best 27 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Test the export directive usable for ensuring a data variable is always added to the output - even if it is never used
  // 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 
  jsr main
  // [3] phi from @1 to @end [phi:@1->@end]
__bend_from___b1:
  jmp __bend
  // @end
__bend:
  // main
main: {
    // [4] *((const byte*) SCREEN) ← (byte) 'x' -- _deref_pbuc1=vbuc2 
    lda #'x'
    sta SCREEN
    jmp __breturn
    // main::@return
  __breturn:
    // [5] return 
    rts
}
  // File Data
  MESSAGE: .text "camelot!"
  .byte 0

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __bend
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label __bbegin with __b1
Removing instruction __bbegin:
Removing instruction __b1_from___bbegin:
Removing instruction __bend_from___b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __bend:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Updating BasicUpstart to call main directly
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Removing instruction __b1:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(const byte*) MESSAGE[]  = (byte*) "camelot!"
(const byte*) SCREEN = (byte*) 1024
(void()) main()
(label) main::@return



FINAL ASSEMBLER
Score: 12

  // File Comments
// Test the export directive usable for ensuring a data variable is always added to the output - even if it is never used
  // 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 
  // [3] phi from @1 to @end [phi:@1->@end]
  // @end
  // main
main: {
    // SCREEN[0] = 'x'
    // [4] *((const byte*) SCREEN) ← (byte) 'x' -- _deref_pbuc1=vbuc2 
    lda #'x'
    sta SCREEN
    // main::@return
    // }
    // [5] return 
    rts
}
  // File Data
  MESSAGE: .text "camelot!"
  .byte 0

