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kickc/src/test/ref/strncat-0.log

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CONTROL FLOW GRAPH SSA
@begin: scope:[] from
to:@1
(void()) main()
main: scope:[main] from @1
(byte*) strncat::destination#0 ← (const byte*) build
(to_nomodify byte*) strncat::source#0 ← (const byte*) hello
(word) strncat::num#0 ← (number) 5
call strncat
(byte*) strncat::return#0 ← (byte*) strncat::return#4
to:main::@3
main::@3: scope:[main] from main
(byte*) strncat::destination#1 ← (const byte*) build
(to_nomodify byte*) strncat::source#1 ← (const byte*) space
(word) strncat::num#1 ← (number) 5
call strncat
(byte*) strncat::return#1 ← (byte*) strncat::return#4
to:main::@4
main::@4: scope:[main] from main::@3
(byte*) strncat::destination#2 ← (const byte*) build
(to_nomodify byte*) strncat::source#2 ← (const byte*) world
(word) strncat::num#2 ← (number) 5
call strncat
(byte*) strncat::return#2 ← (byte*) strncat::return#4
to:main::@5
main::@5: scope:[main] from main::@4
(byte) main::i#0 ← (byte) 0
to:main::@1
main::@1: scope:[main] from main::@2 main::@5
(byte) main::i#2 ← phi( main::@2/(byte) main::i#1 main::@5/(byte) main::i#0 )
(bool~) main::$3 ← (number) 0 != *((const byte*) build + (byte) main::i#2)
if((bool~) main::$3) goto main::@2
to:main::@return
main::@2: scope:[main] from main::@1
(byte) main::i#3 ← phi( main::@1/(byte) main::i#2 )
*((const nomodify byte*) SCREEN + (byte) main::i#3) ← *((const byte*) build + (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
(byte*()) strncat((byte*) strncat::destination , (to_nomodify byte*) strncat::source , (word) strncat::num)
strncat: scope:[strncat] from main main::@3 main::@4
(word) strncat::num#7 ← phi( main/(word) strncat::num#0 main::@3/(word) strncat::num#1 main::@4/(word) strncat::num#2 )
(to_nomodify byte*) strncat::source#7 ← phi( main/(to_nomodify byte*) strncat::source#0 main::@3/(to_nomodify byte*) strncat::source#1 main::@4/(to_nomodify byte*) strncat::source#2 )
(byte*) strncat::destination#3 ← phi( main/(byte*) strncat::destination#0 main::@3/(byte*) strncat::destination#1 main::@4/(byte*) strncat::destination#2 )
(byte*) strncat::dst#0 ← (byte*) strncat::destination#3
to:strncat::@1
strncat::@1: scope:[strncat] from strncat strncat::@2
(byte*) strncat::destination#6 ← phi( strncat/(byte*) strncat::destination#3 strncat::@2/(byte*) strncat::destination#8 )
(word) strncat::num#6 ← phi( strncat/(word) strncat::num#7 strncat::@2/(word) strncat::num#8 )
(to_nomodify byte*) strncat::source#5 ← phi( strncat/(to_nomodify byte*) strncat::source#7 strncat::@2/(to_nomodify byte*) strncat::source#8 )
(byte*) strncat::dst#3 ← phi( strncat/(byte*) strncat::dst#0 strncat::@2/(byte*) strncat::dst#1 )
(bool~) strncat::$1 ← (number) 0 != *((byte*) strncat::dst#3)
if((bool~) strncat::$1) goto strncat::@2
to:strncat::@3
strncat::@2: scope:[strncat] from strncat::@1
(byte*) strncat::destination#8 ← phi( strncat::@1/(byte*) strncat::destination#6 )
(word) strncat::num#8 ← phi( strncat::@1/(word) strncat::num#6 )
(to_nomodify byte*) strncat::source#8 ← phi( strncat::@1/(to_nomodify byte*) strncat::source#5 )
(byte*) strncat::dst#4 ← phi( strncat::@1/(byte*) strncat::dst#3 )
(byte*) strncat::dst#1 ← ++ (byte*) strncat::dst#4
to:strncat::@1
strncat::@3: scope:[strncat] from strncat::@1 strncat::@4
(byte*) strncat::destination#5 ← phi( strncat::@1/(byte*) strncat::destination#6 strncat::@4/(byte*) strncat::destination#7 )
(word) strncat::num#4 ← phi( strncat::@1/(word) strncat::num#6 strncat::@4/(word) strncat::num#3 )
(byte*) strncat::dst#5 ← phi( strncat::@1/(byte*) strncat::dst#3 strncat::@4/(byte*) strncat::dst#2 )
(to_nomodify byte*) strncat::source#4 ← phi( strncat::@1/(to_nomodify byte*) strncat::source#5 strncat::@4/(to_nomodify byte*) strncat::source#6 )
*((byte*) strncat::dst#5) ← *((to_nomodify byte*) strncat::source#4)
(bool~) strncat::$0 ← (word) strncat::num#4 && *((byte*) strncat::dst#5)
(to_nomodify byte*) strncat::source#3 ← ++ (to_nomodify byte*) strncat::source#4
if((bool~) strncat::$0) goto strncat::@4
to:strncat::@5
strncat::@4: scope:[strncat] from strncat::@3
(byte*) strncat::destination#7 ← phi( strncat::@3/(byte*) strncat::destination#5 )
(to_nomodify byte*) strncat::source#6 ← phi( strncat::@3/(to_nomodify byte*) strncat::source#3 )
(byte*) strncat::dst#6 ← phi( strncat::@3/(byte*) strncat::dst#5 )
(word) strncat::num#5 ← phi( strncat::@3/(word) strncat::num#4 )
(word) strncat::num#3 ← -- (word) strncat::num#5
(byte*) strncat::dst#2 ← ++ (byte*) strncat::dst#6
to:strncat::@3
strncat::@5: scope:[strncat] from strncat::@3
(byte*) strncat::destination#4 ← phi( strncat::@3/(byte*) strncat::destination#5 )
(byte*) strncat::dst#7 ← phi( strncat::@3/(byte*) strncat::dst#5 )
*((byte*) strncat::dst#7) ← (number) 0
(byte*) strncat::return#3 ← (byte*) strncat::destination#4
to:strncat::@return
strncat::@return: scope:[strncat] from strncat::@5
(byte*) strncat::return#5 ← phi( strncat::@5/(byte*) strncat::return#3 )
(byte*) strncat::return#4 ← (byte*) strncat::return#5
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*) SCREEN = (byte*)(number) $400
(const byte*) build[(number) $28] = { fill( $28, 0) }
(const byte*) hello[] = (byte*) "hello"
(void()) main()
(bool~) main::$3
(label) main::@1
(label) main::@2
(label) main::@3
(label) main::@4
(label) main::@5
(label) main::@return
(byte) main::i
(byte) main::i#0
(byte) main::i#1
(byte) main::i#2
(byte) main::i#3
(const byte*) space[] = (byte*) " "
(byte*()) strncat((byte*) strncat::destination , (to_nomodify byte*) strncat::source , (word) strncat::num)
(bool~) strncat::$0
(bool~) strncat::$1
(label) strncat::@1
(label) strncat::@2
(label) strncat::@3
(label) strncat::@4
(label) strncat::@5
(label) strncat::@return
(byte*) strncat::destination
(byte*) strncat::destination#0
(byte*) strncat::destination#1
(byte*) strncat::destination#2
(byte*) strncat::destination#3
(byte*) strncat::destination#4
(byte*) strncat::destination#5
(byte*) strncat::destination#6
(byte*) strncat::destination#7
(byte*) strncat::destination#8
(byte*) strncat::dst
(byte*) strncat::dst#0
(byte*) strncat::dst#1
(byte*) strncat::dst#2
(byte*) strncat::dst#3
(byte*) strncat::dst#4
(byte*) strncat::dst#5
(byte*) strncat::dst#6
(byte*) strncat::dst#7
(word) strncat::num
(word) strncat::num#0
(word) strncat::num#1
(word) strncat::num#2
(word) strncat::num#3
(word) strncat::num#4
(word) strncat::num#5
(word) strncat::num#6
(word) strncat::num#7
(word) strncat::num#8
(byte*) strncat::return
(byte*) strncat::return#0
(byte*) strncat::return#1
(byte*) strncat::return#2
(byte*) strncat::return#3
(byte*) strncat::return#4
(byte*) strncat::return#5
(to_nomodify byte*) strncat::source
(to_nomodify byte*) strncat::source#0
(to_nomodify byte*) strncat::source#1
(to_nomodify byte*) strncat::source#2
(to_nomodify byte*) strncat::source#3
(to_nomodify byte*) strncat::source#4
(to_nomodify byte*) strncat::source#5
(to_nomodify byte*) strncat::source#6
(to_nomodify byte*) strncat::source#7
(to_nomodify byte*) strncat::source#8
(const byte*) world[] = (byte*) "world war 3"
Adding number conversion cast (unumber) 5 in (word) strncat::num#0 ← (number) 5
Adding number conversion cast (unumber) 5 in (word) strncat::num#1 ← (number) 5
Adding number conversion cast (unumber) 5 in (word) strncat::num#2 ← (number) 5
Adding number conversion cast (unumber) 0 in (bool~) main::$3 ← (number) 0 != *((const byte*) build + (byte) main::i#2)
Adding number conversion cast (unumber) 0 in (bool~) strncat::$1 ← (number) 0 != *((byte*) strncat::dst#3)
Adding number conversion cast (unumber) 0 in *((byte*) strncat::dst#7) ← (number) 0
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast (word) strncat::num#0 ← (unumber)(number) 5
Inlining cast (word) strncat::num#1 ← (unumber)(number) 5
Inlining cast (word) strncat::num#2 ← (unumber)(number) 5
Inlining cast *((byte*) strncat::dst#7) ← (unumber)(number) 0
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast 5
Simplifying constant integer cast 5
Simplifying constant integer cast 5
Simplifying constant integer cast 0
Simplifying constant integer cast 0
Simplifying constant integer cast 0
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 5
Finalized unsigned number type (byte) 5
Finalized unsigned number type (byte) 5
Finalized unsigned number type (byte) 0
Finalized unsigned number type (byte) 0
Finalized unsigned number type (byte) 0
Successful SSA optimization PassNFinalizeNumberTypeConversions
Alias main::i#2 = main::i#3
Alias strncat::dst#0 = strncat::destination#3
Alias strncat::dst#3 = strncat::dst#4
Alias strncat::source#5 = strncat::source#8
Alias strncat::num#6 = strncat::num#8
Alias strncat::destination#6 = strncat::destination#8
Alias strncat::num#4 = strncat::num#5
Alias strncat::dst#5 = strncat::dst#6 strncat::dst#7
Alias strncat::source#3 = strncat::source#6
Alias strncat::destination#4 = strncat::destination#7 strncat::destination#5 strncat::return#3 strncat::return#5 strncat::return#4
Successful SSA optimization Pass2AliasElimination
Identical Phi Values (to_nomodify byte*) strncat::source#5 (to_nomodify byte*) strncat::source#7
Identical Phi Values (word) strncat::num#6 (word) strncat::num#7
Identical Phi Values (byte*) strncat::destination#6 (byte*) strncat::dst#0
Identical Phi Values (byte*) strncat::destination#4 (byte*) strncat::destination#6
Successful SSA optimization Pass2IdenticalPhiElimination
Simple Condition (bool~) main::$3 [18] if((byte) 0!=*((const byte*) build + (byte) main::i#2)) goto main::@2
Simple Condition (bool~) strncat::$1 [25] if((byte) 0!=*((byte*) strncat::dst#3)) goto strncat::@2
Successful SSA optimization Pass2ConditionalJumpSimplification
Rewriting && if()-condition to two if()s [29] (bool~) strncat::$0 ← (word) strncat::num#4 && *((byte*) strncat::dst#5)
Successful SSA optimization Pass2ConditionalAndOrRewriting
Warning! Adding boolean cast to non-boolean condition (word) strncat::num#4
Warning! Adding boolean cast to non-boolean condition *((byte*) strncat::dst#5)
Constant (const byte*) strncat::destination#0 = build
Constant (const to_nomodify byte*) strncat::source#0 = hello
Constant (const word) strncat::num#0 = 5
Constant (const byte*) strncat::destination#1 = build
Constant (const to_nomodify byte*) strncat::source#1 = space
Constant (const word) strncat::num#1 = 5
Constant (const byte*) strncat::destination#2 = build
Constant (const to_nomodify byte*) strncat::source#2 = world
Constant (const word) strncat::num#2 = 5
Constant (const byte) main::i#0 = 0
Successful SSA optimization Pass2ConstantIdentification
Eliminating unused variable (byte*) strncat::return#0 and assignment [1] (byte*) strncat::return#0 ← (byte*) strncat::dst#0
Eliminating unused variable (byte*) strncat::return#1 and assignment [3] (byte*) strncat::return#1 ← (byte*) strncat::dst#0
Eliminating unused variable (byte*) strncat::return#2 and assignment [5] (byte*) strncat::return#2 ← (byte*) strncat::dst#0
Successful SSA optimization PassNEliminateUnusedVars
Adding number conversion cast (unumber) 0 in (bool~) strncat::$2 ← (number) 0 != (word) strncat::num#4
Adding number conversion cast (unumber) 0 in (bool~) strncat::$3 ← (number) 0 != *((byte*) strncat::dst#5)
Successful SSA optimization PassNAddNumberTypeConversions
Simplifying constant integer cast 0
Simplifying constant integer cast 0
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (byte) 0
Finalized unsigned number type (byte) 0
Successful SSA optimization PassNFinalizeNumberTypeConversions
Simple Condition (bool~) strncat::$2 [16] if((byte) 0!=(word) strncat::num#4) goto strncat::@6
Simple Condition (bool~) strncat::$3 [23] if((byte) 0!=*((byte*) strncat::dst#5)) goto strncat::@4
Successful SSA optimization Pass2ConditionalJumpSimplification
Negating conditional jump and destination [16] if((byte) 0==(word) strncat::num#4) goto strncat::@5
Successful SSA optimization Pass2ConditionalJumpSequenceImprovement
Inlining constant with var siblings (const byte) main::i#0
Inlining constant with var siblings (const to_nomodify byte*) strncat::source#0
Inlining constant with var siblings (const word) strncat::num#0
Inlining constant with var siblings (const to_nomodify byte*) strncat::source#1
Inlining constant with var siblings (const word) strncat::num#1
Inlining constant with var siblings (const to_nomodify byte*) strncat::source#2
Inlining constant with var siblings (const word) strncat::num#2
Constant inlined strncat::destination#2 = (const byte*) build
Constant inlined strncat::source#0 = (const byte*) hello
Constant inlined strncat::source#1 = (const byte*) space
Constant inlined strncat::source#2 = (const byte*) world
Constant inlined strncat::destination#0 = (const byte*) build
Constant inlined strncat::destination#1 = (const byte*) build
Constant inlined main::i#0 = (byte) 0
Constant inlined strncat::num#2 = (byte) 5
Constant inlined strncat::num#1 = (byte) 5
Constant inlined strncat::num#0 = (byte) 5
Successful SSA optimization Pass2ConstantInlining
Identical Phi Values (byte*) strncat::dst#0 (const byte*) build
Identical Phi Values (word) strncat::num#7 (byte) 5
Successful SSA optimization Pass2IdenticalPhiElimination
Added new block during phi lifting strncat::@7(between strncat::@1 and strncat::@3)
Fixing phi predecessor for strncat::num#4 to new block ( strncat::@1 -> strncat::@7 ) during phi lifting.
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::@3
Adding NOP phi() at start of main::@4
Adding NOP phi() at start of main::@5
CALL GRAPH
Calls in [] to main:2
Calls in [main] to strncat:6 strncat:8 strncat:10
Created 6 initial phi equivalence classes
Coalesced [17] main::i#4 ← main::i#1
Coalesced [21] strncat::source#9 ← strncat::source#7
Coalesced [22] strncat::dst#9 ← strncat::dst#3
Coalesced [32] strncat::source#10 ← strncat::source#3
Coalesced [33] strncat::dst#10 ← strncat::dst#2
Coalesced [34] strncat::num#9 ← strncat::num#3
Coalesced [36] strncat::dst#8 ← strncat::dst#1
Coalesced down to 4 phi equivalence classes
Culled Empty Block (label) @2
Culled Empty Block (label) main::@5
Culled Empty Block (label) strncat::@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
Adding NOP phi() at start of main::@3
Adding NOP phi() at start of main::@4
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] phi()
[5] call strncat
to:main::@3
main::@3: scope:[main] from main
[6] phi()
[7] call strncat
to:main::@4
main::@4: scope:[main] from main::@3
[8] phi()
[9] call strncat
to:main::@1
main::@1: scope:[main] from main::@2 main::@4
[10] (byte) main::i#2 ← phi( main::@2/(byte) main::i#1 main::@4/(byte) 0 )
[11] if((byte) 0!=*((const byte*) build + (byte) main::i#2)) goto main::@2
to:main::@return
main::@return: scope:[main] from main::@1
[12] return
to:@return
main::@2: scope:[main] from main::@1
[13] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) build + (byte) main::i#2)
[14] (byte) main::i#1 ← ++ (byte) main::i#2
to:main::@1
(byte*()) strncat((byte*) strncat::destination , (to_nomodify byte*) strncat::source , (word) strncat::num)
strncat: scope:[strncat] from main main::@3 main::@4
[15] (to_nomodify byte*) strncat::source#7 ← phi( main/(const byte*) hello main::@3/(const byte*) space main::@4/(const byte*) world )
to:strncat::@1
strncat::@1: scope:[strncat] from strncat strncat::@2
[16] (byte*) strncat::dst#3 ← phi( strncat/(const byte*) build strncat::@2/(byte*) strncat::dst#1 )
[17] if((byte) 0!=*((byte*) strncat::dst#3)) goto strncat::@2
to:strncat::@3
strncat::@3: scope:[strncat] from strncat::@1 strncat::@4
[18] (word) strncat::num#4 ← phi( strncat::@1/(byte) 5 strncat::@4/(word) strncat::num#3 )
[18] (byte*) strncat::dst#5 ← phi( strncat::@1/(byte*) strncat::dst#3 strncat::@4/(byte*) strncat::dst#2 )
[18] (to_nomodify byte*) strncat::source#4 ← phi( strncat::@1/(to_nomodify byte*) strncat::source#7 strncat::@4/(to_nomodify byte*) strncat::source#3 )
[19] *((byte*) strncat::dst#5) ← *((to_nomodify byte*) strncat::source#4)
[20] (to_nomodify byte*) strncat::source#3 ← ++ (to_nomodify byte*) strncat::source#4
[21] if((byte) 0==(word) strncat::num#4) goto strncat::@5
to:strncat::@6
strncat::@6: scope:[strncat] from strncat::@3
[22] if((byte) 0!=*((byte*) strncat::dst#5)) goto strncat::@4
to:strncat::@5
strncat::@5: scope:[strncat] from strncat::@3 strncat::@6
[23] *((byte*) strncat::dst#5) ← (byte) 0
to:strncat::@return
strncat::@return: scope:[strncat] from strncat::@5
[24] return
to:@return
strncat::@4: scope:[strncat] from strncat::@6
[25] (word) strncat::num#3 ← -- (word) strncat::num#4
[26] (byte*) strncat::dst#2 ← ++ (byte*) strncat::dst#5
to:strncat::@3
strncat::@2: scope:[strncat] from strncat::@1
[27] (byte*) strncat::dst#1 ← ++ (byte*) strncat::dst#3
to:strncat::@1
VARIABLE REGISTER WEIGHTS
(void()) main()
(byte) main::i
(byte) main::i#1 202.0
(byte) main::i#2 168.33333333333331
(byte*()) strncat((byte*) strncat::destination , (to_nomodify byte*) strncat::source , (word) strncat::num)
(byte*) strncat::destination
(byte*) strncat::dst
(byte*) strncat::dst#1 2002.0
(byte*) strncat::dst#2 2002.0
(byte*) strncat::dst#3 2002.0
(byte*) strncat::dst#5 851.0000000000001
(word) strncat::num
(word) strncat::num#3 1001.0
(word) strncat::num#4 600.5999999999999
(byte*) strncat::return
(to_nomodify byte*) strncat::source
(to_nomodify byte*) strncat::source#3 400.4
(to_nomodify byte*) strncat::source#4 2002.0
(to_nomodify byte*) strncat::source#7 250.25
Initial phi equivalence classes
[ main::i#2 main::i#1 ]
[ strncat::source#4 strncat::source#7 strncat::source#3 ]
[ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ]
[ strncat::num#4 strncat::num#3 ]
Complete equivalence classes
[ main::i#2 main::i#1 ]
[ strncat::source#4 strncat::source#7 strncat::source#3 ]
[ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ]
[ strncat::num#4 strncat::num#3 ]
Allocated zp[1]:2 [ main::i#2 main::i#1 ]
Allocated zp[2]:3 [ strncat::source#4 strncat::source#7 strncat::source#3 ]
Allocated zp[2]:5 [ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ]
Allocated zp[2]:7 [ strncat::num#4 strncat::num#3 ]
INITIAL ASM
Target platform is c64basic / MOS6502X
// File Comments
// Test strncat() implementation
// Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.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
// [5] call strncat
// [15] phi from main to strncat [phi:main->strncat]
strncat_from_main:
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) hello [phi:main->strncat#0] -- pbuz1=pbuc1
lda #<hello
sta.z strncat.source
lda #>hello
sta.z strncat.source+1
jsr strncat
// [6] phi from main to main::@3 [phi:main->main::@3]
__b3_from_main:
jmp __b3
// main::@3
__b3:
// [7] call strncat
// [15] phi from main::@3 to strncat [phi:main::@3->strncat]
strncat_from___b3:
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) space [phi:main::@3->strncat#0] -- pbuz1=pbuc1
lda #<space
sta.z strncat.source
lda #>space
sta.z strncat.source+1
jsr strncat
// [8] phi from main::@3 to main::@4 [phi:main::@3->main::@4]
__b4_from___b3:
jmp __b4
// main::@4
__b4:
// [9] call strncat
// [15] phi from main::@4 to strncat [phi:main::@4->strncat]
strncat_from___b4:
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) world [phi:main::@4->strncat#0] -- pbuz1=pbuc1
lda #<world
sta.z strncat.source
lda #>world
sta.z strncat.source+1
jsr strncat
// [10] phi from main::@4 to main::@1 [phi:main::@4->main::@1]
__b1_from___b4:
// [10] phi (byte) main::i#2 = (byte) 0 [phi:main::@4->main::@1#0] -- vbuz1=vbuc1
lda #0
sta.z i
jmp __b1
// main::@1
__b1:
// [11] if((byte) 0!=*((const byte*) build + (byte) main::i#2)) goto main::@2 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1
lda #0
ldy.z i
cmp build,y
bne __b2
jmp __breturn
// main::@return
__breturn:
// [12] return
rts
// main::@2
__b2:
// [13] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) build + (byte) main::i#2) -- pbuc1_derefidx_vbuz1=pbuc2_derefidx_vbuz1
ldy.z i
lda build,y
sta SCREEN,y
// [14] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuz1=_inc_vbuz1
inc.z i
// [10] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
__b1_from___b2:
// [10] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy
jmp __b1
}
// strncat
// Appends the first num characters of source to destination, plus a terminating null-character.
// If the length of the C string in source is less than num, only the content up to the terminating null-character is copied.
// strncat(byte* zp(3) source, word zp(7) num)
strncat: {
.label dst = 5
.label source = 3
.label num = 7
// [16] phi from strncat to strncat::@1 [phi:strncat->strncat::@1]
__b1_from_strncat:
// [16] phi (byte*) strncat::dst#3 = (const byte*) build [phi:strncat->strncat::@1#0] -- pbuz1=pbuc1
lda #<build
sta.z dst
lda #>build
sta.z dst+1
jmp __b1
// Skip the existing string at dest
// strncat::@1
__b1:
// [17] if((byte) 0!=*((byte*) strncat::dst#3)) goto strncat::@2 -- vbuc1_neq__deref_pbuz1_then_la1
ldy #0
lda (dst),y
cmp #0
bne __b2
// [18] phi from strncat::@1 to strncat::@3 [phi:strncat::@1->strncat::@3]
__b3_from___b1:
// [18] phi (word) strncat::num#4 = (byte) 5 [phi:strncat::@1->strncat::@3#0] -- vwuz1=vbuc1
lda #<5
sta.z num
lda #>5
sta.z num+1
// [18] phi (byte*) strncat::dst#5 = (byte*) strncat::dst#3 [phi:strncat::@1->strncat::@3#1] -- register_copy
// [18] phi (to_nomodify byte*) strncat::source#4 = (to_nomodify byte*) strncat::source#7 [phi:strncat::@1->strncat::@3#2] -- register_copy
jmp __b3
// Copy up to num chars from src
// strncat::@3
__b3:
// [19] *((byte*) strncat::dst#5) ← *((to_nomodify byte*) strncat::source#4) -- _deref_pbuz1=_deref_pbuz2
ldy #0
lda (source),y
ldy #0
sta (dst),y
// [20] (to_nomodify byte*) strncat::source#3 ← ++ (to_nomodify byte*) strncat::source#4 -- pbuz1=_inc_pbuz1
inc.z source
bne !+
inc.z source+1
!:
// [21] if((byte) 0==(word) strncat::num#4) goto strncat::@5 -- vbuc1_eq_vwuz1_then_la1
lda #0
cmp.z num
bne !+
lda.z num+1
bne !+
jmp __b5
!:
jmp __b6
// strncat::@6
__b6:
// [22] if((byte) 0!=*((byte*) strncat::dst#5)) goto strncat::@4 -- vbuc1_neq__deref_pbuz1_then_la1
ldy #0
lda (dst),y
cmp #0
bne __b4
jmp __b5
// strncat::@5
__b5:
// [23] *((byte*) strncat::dst#5) ← (byte) 0 -- _deref_pbuz1=vbuc1
// Add null-character
lda #0
ldy #0
sta (dst),y
jmp __breturn
// strncat::@return
__breturn:
// [24] return
rts
// strncat::@4
__b4:
// [25] (word) strncat::num#3 ← -- (word) strncat::num#4 -- vwuz1=_dec_vwuz1
lda.z num
bne !+
dec.z num+1
!:
dec.z num
// [26] (byte*) strncat::dst#2 ← ++ (byte*) strncat::dst#5 -- pbuz1=_inc_pbuz1
inc.z dst
bne !+
inc.z dst+1
!:
// [18] phi from strncat::@4 to strncat::@3 [phi:strncat::@4->strncat::@3]
__b3_from___b4:
// [18] phi (word) strncat::num#4 = (word) strncat::num#3 [phi:strncat::@4->strncat::@3#0] -- register_copy
// [18] phi (byte*) strncat::dst#5 = (byte*) strncat::dst#2 [phi:strncat::@4->strncat::@3#1] -- register_copy
// [18] phi (to_nomodify byte*) strncat::source#4 = (to_nomodify byte*) strncat::source#3 [phi:strncat::@4->strncat::@3#2] -- register_copy
jmp __b3
// strncat::@2
__b2:
// [27] (byte*) strncat::dst#1 ← ++ (byte*) strncat::dst#3 -- pbuz1=_inc_pbuz1
inc.z dst
bne !+
inc.z dst+1
!:
// [16] phi from strncat::@2 to strncat::@1 [phi:strncat::@2->strncat::@1]
__b1_from___b2:
// [16] phi (byte*) strncat::dst#3 = (byte*) strncat::dst#1 [phi:strncat::@2->strncat::@1#0] -- register_copy
jmp __b1
}
// File Data
hello: .text "hello"
.byte 0
space: .text " "
.byte 0
world: .text "world war 3"
.byte 0
build: .fill $28, 0
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [11] if((byte) 0!=*((const byte*) build + (byte) main::i#2)) goto main::@2 [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
Removing always clobbered register reg byte a as potential for zp[1]:2 [ main::i#2 main::i#1 ]
Statement [13] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) build + (byte) main::i#2) [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
Statement [17] if((byte) 0!=*((byte*) strncat::dst#3)) goto strncat::@2 [ strncat::source#7 strncat::dst#3 ] ( main:2::strncat:5 [ strncat::source#7 strncat::dst#3 ] { } main:2::strncat:7 [ strncat::source#7 strncat::dst#3 ] { } main:2::strncat:9 [ strncat::source#7 strncat::dst#3 ] { } ) always clobbers reg byte a reg byte y
Statement [19] *((byte*) strncat::dst#5) ← *((to_nomodify byte*) strncat::source#4) [ strncat::source#4 strncat::dst#5 strncat::num#4 ] ( main:2::strncat:5 [ strncat::source#4 strncat::dst#5 strncat::num#4 ] { } main:2::strncat:7 [ strncat::source#4 strncat::dst#5 strncat::num#4 ] { } main:2::strncat:9 [ strncat::source#4 strncat::dst#5 strncat::num#4 ] { } ) always clobbers reg byte a reg byte y
Statement [21] if((byte) 0==(word) strncat::num#4) goto strncat::@5 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] ( main:2::strncat:5 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:7 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:9 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } ) always clobbers reg byte a
Statement [22] if((byte) 0!=*((byte*) strncat::dst#5)) goto strncat::@4 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] ( main:2::strncat:5 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:7 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:9 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } ) always clobbers reg byte a reg byte y
Statement [23] *((byte*) strncat::dst#5) ← (byte) 0 [ ] ( main:2::strncat:5 [ ] { } main:2::strncat:7 [ ] { } main:2::strncat:9 [ ] { } ) always clobbers reg byte a reg byte y
Statement [25] (word) strncat::num#3 ← -- (word) strncat::num#4 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] ( main:2::strncat:5 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] { } main:2::strncat:7 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] { } main:2::strncat:9 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] { } ) always clobbers reg byte a
Statement [11] if((byte) 0!=*((const byte*) build + (byte) main::i#2)) goto main::@2 [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
Statement [13] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) build + (byte) main::i#2) [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
Statement [17] if((byte) 0!=*((byte*) strncat::dst#3)) goto strncat::@2 [ strncat::source#7 strncat::dst#3 ] ( main:2::strncat:5 [ strncat::source#7 strncat::dst#3 ] { } main:2::strncat:7 [ strncat::source#7 strncat::dst#3 ] { } main:2::strncat:9 [ strncat::source#7 strncat::dst#3 ] { } ) always clobbers reg byte a reg byte y
Statement [19] *((byte*) strncat::dst#5) ← *((to_nomodify byte*) strncat::source#4) [ strncat::source#4 strncat::dst#5 strncat::num#4 ] ( main:2::strncat:5 [ strncat::source#4 strncat::dst#5 strncat::num#4 ] { } main:2::strncat:7 [ strncat::source#4 strncat::dst#5 strncat::num#4 ] { } main:2::strncat:9 [ strncat::source#4 strncat::dst#5 strncat::num#4 ] { } ) always clobbers reg byte a reg byte y
Statement [21] if((byte) 0==(word) strncat::num#4) goto strncat::@5 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] ( main:2::strncat:5 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:7 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:9 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } ) always clobbers reg byte a
Statement [22] if((byte) 0!=*((byte*) strncat::dst#5)) goto strncat::@4 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] ( main:2::strncat:5 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:7 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } main:2::strncat:9 [ strncat::dst#5 strncat::num#4 strncat::source#3 ] { } ) always clobbers reg byte a reg byte y
Statement [23] *((byte*) strncat::dst#5) ← (byte) 0 [ ] ( main:2::strncat:5 [ ] { } main:2::strncat:7 [ ] { } main:2::strncat:9 [ ] { } ) always clobbers reg byte a reg byte y
Statement [25] (word) strncat::num#3 ← -- (word) strncat::num#4 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] ( main:2::strncat:5 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] { } main:2::strncat:7 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] { } main:2::strncat:9 [ strncat::dst#5 strncat::source#3 strncat::num#3 ] { } ) always clobbers reg byte a
Potential registers zp[1]:2 [ main::i#2 main::i#1 ] : zp[1]:2 , reg byte x , reg byte y ,
Potential registers zp[2]:3 [ strncat::source#4 strncat::source#7 strncat::source#3 ] : zp[2]:3 ,
Potential registers zp[2]:5 [ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ] : zp[2]:5 ,
Potential registers zp[2]:7 [ strncat::num#4 strncat::num#3 ] : zp[2]:7 ,
REGISTER UPLIFT SCOPES
Uplift Scope [strncat] 6,857: zp[2]:5 [ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ] 2,652.65: zp[2]:3 [ strncat::source#4 strncat::source#7 strncat::source#3 ] 1,601.6: zp[2]:7 [ strncat::num#4 strncat::num#3 ]
Uplift Scope [main] 370.33: zp[1]:2 [ main::i#2 main::i#1 ]
Uplift Scope []
Uplifting [strncat] best 1991 combination zp[2]:5 [ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ] zp[2]:3 [ strncat::source#4 strncat::source#7 strncat::source#3 ] zp[2]:7 [ strncat::num#4 strncat::num#3 ]
Uplifting [main] best 1871 combination reg byte x [ main::i#2 main::i#1 ]
Uplifting [] best 1871 combination
Allocated (was zp[2]:3) zp[2]:2 [ strncat::source#4 strncat::source#7 strncat::source#3 ]
Allocated (was zp[2]:5) zp[2]:4 [ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ]
Allocated (was zp[2]:7) zp[2]:6 [ strncat::num#4 strncat::num#3 ]
ASSEMBLER BEFORE OPTIMIZATION
// File Comments
// Test strncat() implementation
// Upstart
.pc = $801 "Basic"
:BasicUpstart(main)
.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] call strncat
// [15] phi from main to strncat [phi:main->strncat]
strncat_from_main:
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) hello [phi:main->strncat#0] -- pbuz1=pbuc1
lda #<hello
sta.z strncat.source
lda #>hello
sta.z strncat.source+1
jsr strncat
// [6] phi from main to main::@3 [phi:main->main::@3]
__b3_from_main:
jmp __b3
// main::@3
__b3:
// [7] call strncat
// [15] phi from main::@3 to strncat [phi:main::@3->strncat]
strncat_from___b3:
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) space [phi:main::@3->strncat#0] -- pbuz1=pbuc1
lda #<space
sta.z strncat.source
lda #>space
sta.z strncat.source+1
jsr strncat
// [8] phi from main::@3 to main::@4 [phi:main::@3->main::@4]
__b4_from___b3:
jmp __b4
// main::@4
__b4:
// [9] call strncat
// [15] phi from main::@4 to strncat [phi:main::@4->strncat]
strncat_from___b4:
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) world [phi:main::@4->strncat#0] -- pbuz1=pbuc1
lda #<world
sta.z strncat.source
lda #>world
sta.z strncat.source+1
jsr strncat
// [10] phi from main::@4 to main::@1 [phi:main::@4->main::@1]
__b1_from___b4:
// [10] phi (byte) main::i#2 = (byte) 0 [phi:main::@4->main::@1#0] -- vbuxx=vbuc1
ldx #0
jmp __b1
// main::@1
__b1:
// [11] if((byte) 0!=*((const byte*) build + (byte) main::i#2)) goto main::@2 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1
lda build,x
cmp #0
bne __b2
jmp __breturn
// main::@return
__breturn:
// [12] return
rts
// main::@2
__b2:
// [13] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) build + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuxx
lda build,x
sta SCREEN,x
// [14] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx
inx
// [10] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
__b1_from___b2:
// [10] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy
jmp __b1
}
// strncat
// Appends the first num characters of source to destination, plus a terminating null-character.
// If the length of the C string in source is less than num, only the content up to the terminating null-character is copied.
// strncat(byte* zp(2) source, word zp(6) num)
strncat: {
.label dst = 4
.label source = 2
.label num = 6
// [16] phi from strncat to strncat::@1 [phi:strncat->strncat::@1]
__b1_from_strncat:
// [16] phi (byte*) strncat::dst#3 = (const byte*) build [phi:strncat->strncat::@1#0] -- pbuz1=pbuc1
lda #<build
sta.z dst
lda #>build
sta.z dst+1
jmp __b1
// Skip the existing string at dest
// strncat::@1
__b1:
// [17] if((byte) 0!=*((byte*) strncat::dst#3)) goto strncat::@2 -- vbuc1_neq__deref_pbuz1_then_la1
ldy #0
lda (dst),y
cmp #0
bne __b2
// [18] phi from strncat::@1 to strncat::@3 [phi:strncat::@1->strncat::@3]
__b3_from___b1:
// [18] phi (word) strncat::num#4 = (byte) 5 [phi:strncat::@1->strncat::@3#0] -- vwuz1=vbuc1
lda #<5
sta.z num
lda #>5
sta.z num+1
// [18] phi (byte*) strncat::dst#5 = (byte*) strncat::dst#3 [phi:strncat::@1->strncat::@3#1] -- register_copy
// [18] phi (to_nomodify byte*) strncat::source#4 = (to_nomodify byte*) strncat::source#7 [phi:strncat::@1->strncat::@3#2] -- register_copy
jmp __b3
// Copy up to num chars from src
// strncat::@3
__b3:
// [19] *((byte*) strncat::dst#5) ← *((to_nomodify byte*) strncat::source#4) -- _deref_pbuz1=_deref_pbuz2
ldy #0
lda (source),y
ldy #0
sta (dst),y
// [20] (to_nomodify byte*) strncat::source#3 ← ++ (to_nomodify byte*) strncat::source#4 -- pbuz1=_inc_pbuz1
inc.z source
bne !+
inc.z source+1
!:
// [21] if((byte) 0==(word) strncat::num#4) goto strncat::@5 -- vbuc1_eq_vwuz1_then_la1
lda #0
cmp.z num
bne !+
lda.z num+1
bne !+
jmp __b5
!:
jmp __b6
// strncat::@6
__b6:
// [22] if((byte) 0!=*((byte*) strncat::dst#5)) goto strncat::@4 -- vbuc1_neq__deref_pbuz1_then_la1
ldy #0
lda (dst),y
cmp #0
bne __b4
jmp __b5
// strncat::@5
__b5:
// [23] *((byte*) strncat::dst#5) ← (byte) 0 -- _deref_pbuz1=vbuc1
// Add null-character
lda #0
ldy #0
sta (dst),y
jmp __breturn
// strncat::@return
__breturn:
// [24] return
rts
// strncat::@4
__b4:
// [25] (word) strncat::num#3 ← -- (word) strncat::num#4 -- vwuz1=_dec_vwuz1
lda.z num
bne !+
dec.z num+1
!:
dec.z num
// [26] (byte*) strncat::dst#2 ← ++ (byte*) strncat::dst#5 -- pbuz1=_inc_pbuz1
inc.z dst
bne !+
inc.z dst+1
!:
// [18] phi from strncat::@4 to strncat::@3 [phi:strncat::@4->strncat::@3]
__b3_from___b4:
// [18] phi (word) strncat::num#4 = (word) strncat::num#3 [phi:strncat::@4->strncat::@3#0] -- register_copy
// [18] phi (byte*) strncat::dst#5 = (byte*) strncat::dst#2 [phi:strncat::@4->strncat::@3#1] -- register_copy
// [18] phi (to_nomodify byte*) strncat::source#4 = (to_nomodify byte*) strncat::source#3 [phi:strncat::@4->strncat::@3#2] -- register_copy
jmp __b3
// strncat::@2
__b2:
// [27] (byte*) strncat::dst#1 ← ++ (byte*) strncat::dst#3 -- pbuz1=_inc_pbuz1
inc.z dst
bne !+
inc.z dst+1
!:
// [16] phi from strncat::@2 to strncat::@1 [phi:strncat::@2->strncat::@1]
__b1_from___b2:
// [16] phi (byte*) strncat::dst#3 = (byte*) strncat::dst#1 [phi:strncat::@2->strncat::@1#0] -- register_copy
jmp __b1
}
// File Data
hello: .text "hello"
.byte 0
space: .text " "
.byte 0
world: .text "world war 3"
.byte 0
build: .fill $28, 0
ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __bend
Removing instruction jmp __b3
Removing instruction jmp __b4
Removing instruction jmp __b1
Removing instruction jmp __breturn
Removing instruction jmp __b1
Removing instruction jmp __b3
Removing instruction jmp __b6
Removing instruction jmp __b5
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction ldy #0
Replacing instruction ldy #0 with TAY
Succesful ASM optimization Pass5UnnecesaryLoadElimination
Removing instruction __b1_from___bbegin:
Removing instruction __b1:
Removing instruction main_from___b1:
Removing instruction __bend_from___b1:
Removing instruction __b3_from_main:
Removing instruction strncat_from___b3:
Removing instruction __b4_from___b3:
Removing instruction strncat_from___b4:
Succesful ASM optimization Pass5RedundantLabelElimination
Removing instruction __bbegin:
Removing instruction __bend:
Removing instruction strncat_from_main:
Removing instruction __b3:
Removing instruction __b4:
Removing instruction __b1_from___b4:
Removing instruction __breturn:
Removing instruction __b1_from___b2:
Removing instruction __b1_from_strncat:
Removing instruction __b3_from___b1:
Removing instruction __b6:
Removing instruction __breturn:
Removing instruction __b3_from___b4:
Removing instruction __b1_from___b2:
Succesful ASM optimization Pass5UnusedLabelElimination
Removing instruction jsr main
Succesful ASM optimization Pass5SkipBegin
Replacing instruction lda #>5 with TYA
FINAL SYMBOL TABLE
(label) @1
(label) @begin
(label) @end
(const nomodify byte*) SCREEN = (byte*) 1024
(const byte*) build[(number) $28] = { fill( $28, 0) }
(const byte*) hello[] = (byte*) "hello"
(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 x 202.0
(byte) main::i#2 reg byte x 168.33333333333331
(const byte*) space[] = (byte*) " "
(byte*()) strncat((byte*) strncat::destination , (to_nomodify byte*) strncat::source , (word) strncat::num)
(label) strncat::@1
(label) strncat::@2
(label) strncat::@3
(label) strncat::@4
(label) strncat::@5
(label) strncat::@6
(label) strncat::@return
(byte*) strncat::destination
(byte*) strncat::dst
(byte*) strncat::dst#1 dst zp[2]:4 2002.0
(byte*) strncat::dst#2 dst zp[2]:4 2002.0
(byte*) strncat::dst#3 dst zp[2]:4 2002.0
(byte*) strncat::dst#5 dst zp[2]:4 851.0000000000001
(word) strncat::num
(word) strncat::num#3 num zp[2]:6 1001.0
(word) strncat::num#4 num zp[2]:6 600.5999999999999
(byte*) strncat::return
(to_nomodify byte*) strncat::source
(to_nomodify byte*) strncat::source#3 source zp[2]:2 400.4
(to_nomodify byte*) strncat::source#4 source zp[2]:2 2002.0
(to_nomodify byte*) strncat::source#7 source zp[2]:2 250.25
(const byte*) world[] = (byte*) "world war 3"
reg byte x [ main::i#2 main::i#1 ]
zp[2]:2 [ strncat::source#4 strncat::source#7 strncat::source#3 ]
zp[2]:4 [ strncat::dst#5 strncat::dst#3 strncat::dst#1 strncat::dst#2 ]
zp[2]:6 [ strncat::num#4 strncat::num#3 ]
FINAL ASSEMBLER
Score: 1650
// File Comments
// Test strncat() implementation
// 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: {
// strncat(build, hello, 5)
// [5] call strncat
// [15] phi from main to strncat [phi:main->strncat]
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) hello [phi:main->strncat#0] -- pbuz1=pbuc1
lda #<hello
sta.z strncat.source
lda #>hello
sta.z strncat.source+1
jsr strncat
// [6] phi from main to main::@3 [phi:main->main::@3]
// main::@3
// strncat(build, space, 5)
// [7] call strncat
// [15] phi from main::@3 to strncat [phi:main::@3->strncat]
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) space [phi:main::@3->strncat#0] -- pbuz1=pbuc1
lda #<space
sta.z strncat.source
lda #>space
sta.z strncat.source+1
jsr strncat
// [8] phi from main::@3 to main::@4 [phi:main::@3->main::@4]
// main::@4
// strncat(build, world, 5)
// [9] call strncat
// [15] phi from main::@4 to strncat [phi:main::@4->strncat]
// [15] phi (to_nomodify byte*) strncat::source#7 = (const byte*) world [phi:main::@4->strncat#0] -- pbuz1=pbuc1
lda #<world
sta.z strncat.source
lda #>world
sta.z strncat.source+1
jsr strncat
// [10] phi from main::@4 to main::@1 [phi:main::@4->main::@1]
// [10] phi (byte) main::i#2 = (byte) 0 [phi:main::@4->main::@1#0] -- vbuxx=vbuc1
ldx #0
// main::@1
__b1:
// while(build[i])
// [11] if((byte) 0!=*((const byte*) build + (byte) main::i#2)) goto main::@2 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1
lda build,x
cmp #0
bne __b2
// main::@return
// }
// [12] return
rts
// main::@2
__b2:
// SCREEN[i] = build[i]
// [13] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) build + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuxx
lda build,x
sta SCREEN,x
// i++;
// [14] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx
inx
// [10] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
// [10] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy
jmp __b1
}
// strncat
// Appends the first num characters of source to destination, plus a terminating null-character.
// If the length of the C string in source is less than num, only the content up to the terminating null-character is copied.
// strncat(byte* zp(2) source, word zp(6) num)
strncat: {
.label dst = 4
.label source = 2
.label num = 6
// [16] phi from strncat to strncat::@1 [phi:strncat->strncat::@1]
// [16] phi (byte*) strncat::dst#3 = (const byte*) build [phi:strncat->strncat::@1#0] -- pbuz1=pbuc1
lda #<build
sta.z dst
lda #>build
sta.z dst+1
// Skip the existing string at dest
// strncat::@1
__b1:
// while (*dst)
// [17] if((byte) 0!=*((byte*) strncat::dst#3)) goto strncat::@2 -- vbuc1_neq__deref_pbuz1_then_la1
ldy #0
lda (dst),y
cmp #0
bne __b2
// [18] phi from strncat::@1 to strncat::@3 [phi:strncat::@1->strncat::@3]
// [18] phi (word) strncat::num#4 = (byte) 5 [phi:strncat::@1->strncat::@3#0] -- vwuz1=vbuc1
lda #<5
sta.z num
tya
sta.z num+1
// [18] phi (byte*) strncat::dst#5 = (byte*) strncat::dst#3 [phi:strncat::@1->strncat::@3#1] -- register_copy
// [18] phi (to_nomodify byte*) strncat::source#4 = (to_nomodify byte*) strncat::source#7 [phi:strncat::@1->strncat::@3#2] -- register_copy
// Copy up to num chars from src
// strncat::@3
__b3:
// *dst = *source++
// [19] *((byte*) strncat::dst#5) ← *((to_nomodify byte*) strncat::source#4) -- _deref_pbuz1=_deref_pbuz2
ldy #0
lda (source),y
sta (dst),y
// while (num && (*dst = *source++))
// [20] (to_nomodify byte*) strncat::source#3 ← ++ (to_nomodify byte*) strncat::source#4 -- pbuz1=_inc_pbuz1
inc.z source
bne !+
inc.z source+1
!:
// [21] if((byte) 0==(word) strncat::num#4) goto strncat::@5 -- vbuc1_eq_vwuz1_then_la1
lda #0
cmp.z num
bne !+
lda.z num+1
bne !+
jmp __b5
!:
// strncat::@6
// [22] if((byte) 0!=*((byte*) strncat::dst#5)) goto strncat::@4 -- vbuc1_neq__deref_pbuz1_then_la1
ldy #0
lda (dst),y
cmp #0
bne __b4
// strncat::@5
__b5:
// *dst = 0
// [23] *((byte*) strncat::dst#5) ← (byte) 0 -- _deref_pbuz1=vbuc1
// Add null-character
lda #0
tay
sta (dst),y
// strncat::@return
// }
// [24] return
rts
// strncat::@4
__b4:
// --num;
// [25] (word) strncat::num#3 ← -- (word) strncat::num#4 -- vwuz1=_dec_vwuz1
lda.z num
bne !+
dec.z num+1
!:
dec.z num
// ++dst;
// [26] (byte*) strncat::dst#2 ← ++ (byte*) strncat::dst#5 -- pbuz1=_inc_pbuz1
inc.z dst
bne !+
inc.z dst+1
!:
// [18] phi from strncat::@4 to strncat::@3 [phi:strncat::@4->strncat::@3]
// [18] phi (word) strncat::num#4 = (word) strncat::num#3 [phi:strncat::@4->strncat::@3#0] -- register_copy
// [18] phi (byte*) strncat::dst#5 = (byte*) strncat::dst#2 [phi:strncat::@4->strncat::@3#1] -- register_copy
// [18] phi (to_nomodify byte*) strncat::source#4 = (to_nomodify byte*) strncat::source#3 [phi:strncat::@4->strncat::@3#2] -- register_copy
jmp __b3
// strncat::@2
__b2:
// dst++;
// [27] (byte*) strncat::dst#1 ← ++ (byte*) strncat::dst#3 -- pbuz1=_inc_pbuz1
inc.z dst
bne !+
inc.z dst+1
!:
// [16] phi from strncat::@2 to strncat::@1 [phi:strncat::@2->strncat::@1]
// [16] phi (byte*) strncat::dst#3 = (byte*) strncat::dst#1 [phi:strncat::@2->strncat::@1#0] -- register_copy
jmp __b1
}
// File Data
hello: .text "hello"
.byte 0
space: .text " "
.byte 0
world: .text "world war 3"
.byte 0
build: .fill $28, 0
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