kickc/src/test/ref/var-forward-problem.log

Resolved forward reference b to (const nomodify byte) b
Resolved forward reference screen to (const nomodify byte*) screen

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

(void()) main()
main: scope:[main]  from @1
  *((const nomodify byte*) screen) ← (const nomodify byte) b
  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 nomodify byte) b = (byte) 'a'
(void()) main()
(label) main::@return
(const nomodify byte*) screen = (byte*)(number) $400

Simplifying constant pointer cast (byte*) 1024
Successful SSA optimization PassNCastSimplification
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 nomodify byte*) screen) ← (const nomodify byte) b
  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
// Illustrates the problem with variable forward references not working
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const b = 'a'
  .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 nomodify byte*) screen) ← (const nomodify byte) b -- _deref_pbuc1=vbuc2 
    lda #b
    sta screen
    jmp __breturn
    // main::@return
  __breturn:
    // [5] return 
    rts
}
  // File Data

REGISTER UPLIFT POTENTIAL REGISTERS
Statement [4] *((const nomodify byte*) screen) ← (const nomodify byte) b [ ] ( 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
// Illustrates the problem with variable forward references not working
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const b = 'a'
  .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 nomodify byte*) screen) ← (const nomodify byte) b -- _deref_pbuc1=vbuc2 
    lda #b
    sta screen
    jmp __breturn
    // main::@return
  __breturn:
    // [5] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __bend
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction __b1_from___bbegin:
Removing instruction __b1:
Removing instruction __bend_from___b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __bbegin:
Removing instruction __bend:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(const nomodify byte) b = (byte) 'a'
(void()) main()
(label) main::@return
(const nomodify byte*) screen = (byte*) 1024



FINAL ASSEMBLER
Score: 12

  // File Comments
// Illustrates the problem with variable forward references not working
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  .const b = 'a'
  .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 = b
    // [4] *((const nomodify byte*) screen) ← (const nomodify byte) b -- _deref_pbuc1=vbuc2 
    lda #b
    sta screen
    // main::@return
    // }
    // [5] return 
    rts
}
  // File Data