kickc/src/test/ref/for-empty-increment.log

Culled Empty Block (label) main::@4
Culled Empty Block (label) main::@3
Culled Empty Block (label) main::@5
Culled Empty Block (label) main::@6

CONTROL FLOW GRAPH SSA
@begin: scope:[]  from
  to:@1
main: scope:[main]  from @1
  (byte*) main::SCREEN#0 ← ((byte*)) (number) $400
  (byte) main::i#0 ← (number) 0
  to:main::@1
main::@1: scope:[main]  from main main::@2
  (byte) main::i#2 ← phi( main/(byte) main::i#0 main::@2/(byte) main::i#1 )
  (bool~) main::$0 ← (byte) main::i#2 < (number) $a
  if((bool~) main::$0) goto main::@2
  to:main::@return
main::@2: scope:[main]  from main::@1
  (byte) main::i#3 ← phi( main::@1/(byte) main::i#2 )
  *((byte*) main::SCREEN#0 + (byte) main::i#3) ← (byte) main::i#3
  (byte) main::i#1 ← ++ (byte) main::i#3
  to:main::@1
main::@return: scope:[main]  from main::@1
  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
(void()) main()
(bool~) main::$0
(label) main::@1
(label) main::@2
(label) main::@return
(byte*) main::SCREEN
(byte*) main::SCREEN#0
(byte) main::i
(byte) main::i#0
(byte) main::i#1
(byte) main::i#2
(byte) main::i#3

Adding number conversion cast (unumber) 0 in (byte) main::i#0 ← (number) 0
Adding number conversion cast (unumber) $a in (bool~) main::$0 ← (byte) main::i#2 < (number) $a
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast (byte*) main::SCREEN#0 ← (byte*)(number) $400
Inlining cast (byte) main::i#0 ← (unumber)(number) 0
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast 0
Simplifying constant integer cast $a
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 0
Finalized unsigned number type (byte) $a
Successful SSA optimization PassNFinalizeNumberTypeConversions
Alias (byte) main::i#2 = (byte) main::i#3 
Successful SSA optimization Pass2AliasElimination
Simple Condition (bool~) main::$0 [4] if((byte) main::i#2<(byte) $a) goto main::@2
Successful SSA optimization Pass2ConditionalJumpSimplification
Constant (const byte*) main::SCREEN#0 = (byte*) 1024
Constant (const byte) main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Successful SSA optimization Pass2LoopHeadConstantIdentification
Alias (byte) main::i#1 = (byte) main::i#2 
Successful SSA optimization Pass2AliasElimination
Identical Phi Values (byte) main::i#5 (const byte) main::i#0
Successful SSA optimization Pass2IdenticalPhiElimination
if() condition always true - replacing block destination [9] if((const byte) main::i#0<(byte) $a) goto main::@2
Successful SSA optimization Pass2ConstantIfs
Inlining constant with var siblings (const byte) main::i#0
Constant inlined main::i#0 = (byte) 0
Successful SSA optimization Pass2ConstantInlining
Added new block during phi lifting main::@7(between main::@1 and main::@2)
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
Adding NOP phi() at start of main
Adding NOP phi() at start of main::@1_1
CALL GRAPH
Calls in [] to main:2 

Created 1 initial phi equivalence classes
Coalesced [12] main::i#6 ← main::i#1
Coalesced down to 1 phi equivalence classes
Culled Empty Block (label) @2
Culled Empty Block (label) main::@1_1
Culled Empty Block (label) main::@7
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::@2
main::@2: scope:[main]  from main main::@1
  [5] (byte) main::i#4 ← phi( main::@1/(byte) main::i#1 main/(byte) 0 )
  [6] *((const byte*) main::SCREEN#0 + (byte) main::i#4) ← (byte) main::i#4
  [7] (byte) main::i#1 ← ++ (byte) main::i#4
  to:main::@1
main::@1: scope:[main]  from main::@2
  [8] if((byte) main::i#1<(byte) $a) goto main::@2
  to:main::@return
main::@return: scope:[main]  from main::@1
  [9] return 
  to:@return


VARIABLE REGISTER WEIGHTS
(void()) main()
(byte*) main::SCREEN
(byte) main::i
(byte) main::i#1 16.5
(byte) main::i#4 22.0

Initial phi equivalence classes
[ main::i#4 main::i#1 ]
Complete equivalence classes
[ main::i#4 main::i#1 ]
Allocated zp ZP_BYTE:2 [ main::i#4 main::i#1 ]

INITIAL ASM
Target platform is c64basic
  // File Comments
// Tests that for()-loops can have empty increments
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  // @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 SCREEN = $400
    .label i = 2
    // [5] phi from main to main::@2 [phi:main->main::@2]
  b2_from_main:
    // [5] phi (byte) main::i#4 = (byte) 0 [phi:main->main::@2#0] -- vbuz1=vbuc1 
    lda #0
    sta.z i
    jmp b2
    // [5] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
  b2_from_b1:
    // [5] phi (byte) main::i#4 = (byte) main::i#1 [phi:main::@1->main::@2#0] -- register_copy 
    jmp b2
    // main::@2
  b2:
    // [6] *((const byte*) main::SCREEN#0 + (byte) main::i#4) ← (byte) main::i#4 -- pbuc1_derefidx_vbuz1=vbuz1 
    ldy.z i
    tya
    sta SCREEN,y
    // [7] (byte) main::i#1 ← ++ (byte) main::i#4 -- vbuz1=_inc_vbuz1 
    inc.z i
    jmp b1
    // main::@1
  b1:
    // [8] if((byte) main::i#1<(byte) $a) goto main::@2 -- vbuz1_lt_vbuc1_then_la1 
    lda.z i
    cmp #$a
    bcc b2_from_b1
    jmp breturn
    // main::@return
  breturn:
    // [9] return 
    rts
}
  // File Data

REGISTER UPLIFT POTENTIAL REGISTERS
Potential registers zp ZP_BYTE:2 [ main::i#4 main::i#1 ] : zp ZP_BYTE:2 , reg byte a , reg byte x , reg byte y , 

REGISTER UPLIFT SCOPES
Uplift Scope [main] 38.5: zp ZP_BYTE:2 [ main::i#4 main::i#1 ] 
Uplift Scope [] 

Uplifting [main] best 293 combination reg byte x [ main::i#4 main::i#1 ] 
Uplifting [] best 293 combination 

ASSEMBLER BEFORE OPTIMIZATION
  // File Comments
// Tests that for()-loops can have empty increments
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(bbegin)
.pc = $80d "Program"
  // Global Constants & labels
  // @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 SCREEN = $400
    // [5] phi from main to main::@2 [phi:main->main::@2]
  b2_from_main:
    // [5] phi (byte) main::i#4 = (byte) 0 [phi:main->main::@2#0] -- vbuxx=vbuc1 
    ldx #0
    jmp b2
    // [5] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
  b2_from_b1:
    // [5] phi (byte) main::i#4 = (byte) main::i#1 [phi:main::@1->main::@2#0] -- register_copy 
    jmp b2
    // main::@2
  b2:
    // [6] *((const byte*) main::SCREEN#0 + (byte) main::i#4) ← (byte) main::i#4 -- pbuc1_derefidx_vbuxx=vbuxx 
    txa
    sta SCREEN,x
    // [7] (byte) main::i#1 ← ++ (byte) main::i#4 -- vbuxx=_inc_vbuxx 
    inx
    jmp b1
    // main::@1
  b1:
    // [8] if((byte) main::i#1<(byte) $a) goto main::@2 -- vbuxx_lt_vbuc1_then_la1 
    cpx #$a
    bcc b2_from_b1
    jmp breturn
    // main::@return
  breturn:
    // [9] return 
    rts
}
  // File Data

ASSEMBLER OPTIMIZATIONS
Removing instruction jmp b1
Removing instruction jmp bend
Removing instruction jmp b2
Removing instruction jmp b1
Removing instruction jmp breturn
Succesful ASM optimization Pass5NextJumpElimination
Replacing label b2_from_b1 with b2
Removing instruction b1_from_bbegin:
Removing instruction b1:
Removing instruction main_from_b1:
Removing instruction bend_from_b1:
Removing instruction b2_from_b1:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction bend:
Removing instruction b2_from_main:
Removing instruction b1:
Removing instruction breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
Updating BasicUpstart to call main directly
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Removing instruction jmp b2
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction bbegin:
Succesful ASM optimization Pass5UnusedLabelElimination

FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(void()) main()
(label) main::@1
(label) main::@2
(label) main::@return
(byte*) main::SCREEN
(const byte*) main::SCREEN#0 SCREEN = (byte*) 1024
(byte) main::i
(byte) main::i#1 reg byte x 16.5
(byte) main::i#4 reg byte x 22.0

reg byte x [ main::i#4 main::i#1 ]


FINAL ASSEMBLER
Score: 161

  // File Comments
// Tests that for()-loops can have empty increments
  // Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.pc = $80d "Program"
  // Global Constants & labels
  // @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: {
    .label SCREEN = $400
    // [5] phi from main to main::@2 [phi:main->main::@2]
    // [5] phi (byte) main::i#4 = (byte) 0 [phi:main->main::@2#0] -- vbuxx=vbuc1 
    ldx #0
    // [5] phi from main::@1 to main::@2 [phi:main::@1->main::@2]
    // [5] phi (byte) main::i#4 = (byte) main::i#1 [phi:main::@1->main::@2#0] -- register_copy 
    // main::@2
  b2:
    // SCREEN[i] = i++
    // [6] *((const byte*) main::SCREEN#0 + (byte) main::i#4) ← (byte) main::i#4 -- pbuc1_derefidx_vbuxx=vbuxx 
    txa
    sta SCREEN,x
    // SCREEN[i] = i++;
    // [7] (byte) main::i#1 ← ++ (byte) main::i#4 -- vbuxx=_inc_vbuxx 
    inx
    // main::@1
    // for(unsigned char i=0;i<10;)
    // [8] if((byte) main::i#1<(byte) $a) goto main::@2 -- vbuxx_lt_vbuc1_then_la1 
    cpx #$a
    bcc b2
    // main::@return
    // }
    // [9] return 
    rts
}
  // File Data