mirror of
https://gitlab.com/camelot/kickc.git
synced 2024-09-09 08:54:40 +00:00
618 lines
21 KiB
Plaintext
618 lines
21 KiB
Plaintext
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CONTROL FLOW GRAPH SSA
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@begin: scope:[] from
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to:@1
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(void()) main()
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main: scope:[main] from @1
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(byte*) main::msg#0 ← (const byte*) MESSAGE
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to:main::@1
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main::@1: scope:[main] from main main::@1
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(byte*) main::msg#4 ← phi( main/(byte*) main::msg#0 main::@1/(byte*) main::msg#1 )
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(byte~) main::$0 ← *((byte*) main::msg#4)
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(byte*) main::msg#1 ← ++ (byte*) main::msg#4
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(bool~) main::$1 ← (number) 0 != (byte~) main::$0
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if((bool~) main::$1) goto main::@1
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to:main::@2
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main::@2: scope:[main] from main::@1
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(byte*) main::msg#5 ← phi( main::@1/(byte*) main::msg#1 )
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(byte*) main::msg#2 ← -- (byte*) main::msg#5
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*((byte*) main::msg#2) ← (byte) 'x'
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(byte*) main::msg#3 ← ++ (byte*) main::msg#2
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*((byte*) main::msg#3) ← (number) 0
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(byte) main::i#0 ← (byte) 0
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to:main::@3
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main::@3: scope:[main] from main::@2 main::@4
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(byte) main::i#2 ← phi( main::@2/(byte) main::i#0 main::@4/(byte) main::i#1 )
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(bool~) main::$2 ← (number) 0 != *((const byte*) MESSAGE + (byte) main::i#2)
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if((bool~) main::$2) goto main::@4
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to:main::@return
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main::@4: scope:[main] from main::@3
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(byte) main::i#3 ← phi( main::@3/(byte) main::i#2 )
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*((const nomodify byte*) SCREEN + (byte) main::i#3) ← *((const byte*) MESSAGE + (byte) main::i#3)
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(byte) main::i#1 ← ++ (byte) main::i#3
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to:main::@3
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main::@return: scope:[main] from main::@3
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return
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to:@return
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@1: scope:[] from @begin
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call main
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to:@2
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@2: scope:[] from @1
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to:@end
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@end: scope:[] from @2
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SYMBOL TABLE SSA
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(label) @1
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(label) @2
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(label) @begin
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(label) @end
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(const byte*) MESSAGE[(number) $14] = (byte*) "camelot"
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(const nomodify byte*) SCREEN = (byte*)(number) $400
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(void()) main()
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(byte~) main::$0
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(bool~) main::$1
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(bool~) main::$2
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(label) main::@1
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(label) main::@2
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(label) main::@3
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(label) main::@4
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(label) main::@return
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(byte) main::i
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(byte) main::i#0
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(byte) main::i#1
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(byte) main::i#2
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(byte) main::i#3
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(byte*) main::msg
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(byte*) main::msg#0
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(byte*) main::msg#1
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(byte*) main::msg#2
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(byte*) main::msg#3
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(byte*) main::msg#4
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(byte*) main::msg#5
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Adding number conversion cast (unumber) 0 in (bool~) main::$1 ← (number) 0 != (byte~) main::$0
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Adding number conversion cast (unumber) 0 in *((byte*) main::msg#3) ← (number) 0
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Adding number conversion cast (unumber) 0 in (bool~) main::$2 ← (number) 0 != *((const byte*) MESSAGE + (byte) main::i#2)
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Successful SSA optimization PassNAddNumberTypeConversions
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Inlining cast *((byte*) main::msg#3) ← (unumber)(number) 0
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Successful SSA optimization Pass2InlineCast
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Simplifying constant pointer cast (byte*) 1024
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Simplifying constant integer cast 0
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Simplifying constant integer cast 0
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Simplifying constant integer cast 0
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Successful SSA optimization PassNCastSimplification
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Finalized unsigned number type (byte) 0
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Finalized unsigned number type (byte) 0
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Finalized unsigned number type (byte) 0
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Successful SSA optimization PassNFinalizeNumberTypeConversions
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Alias main::msg#1 = main::msg#5
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Alias main::i#2 = main::i#3
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Successful SSA optimization Pass2AliasElimination
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Simple Condition (bool~) main::$1 [5] if((byte) 0!=(byte~) main::$0) goto main::@1
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Simple Condition (bool~) main::$2 [13] if((byte) 0!=*((const byte*) MESSAGE + (byte) main::i#2)) goto main::@4
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Successful SSA optimization Pass2ConditionalJumpSimplification
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Constant (const byte*) main::msg#0 = MESSAGE
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Constant (const byte) main::i#0 = 0
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Successful SSA optimization Pass2ConstantIdentification
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Inlining constant with var siblings (const byte*) main::msg#0
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Inlining constant with var siblings (const byte) main::i#0
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Constant inlined main::i#0 = (byte) 0
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Constant inlined main::msg#0 = (const byte*) MESSAGE
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Successful SSA optimization Pass2ConstantInlining
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Added new block during phi lifting main::@5(between main::@1 and main::@1)
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Adding NOP phi() at start of @begin
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Adding NOP phi() at start of @1
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Adding NOP phi() at start of @2
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Adding NOP phi() at start of @end
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Adding NOP phi() at start of main
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CALL GRAPH
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Calls in [] to main:2
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Created 2 initial phi equivalence classes
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Coalesced [19] main::i#4 ← main::i#1
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Coalesced [20] main::msg#6 ← main::msg#1
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Coalesced down to 2 phi equivalence classes
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Culled Empty Block (label) @2
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Culled Empty Block (label) main::@5
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Adding NOP phi() at start of @begin
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Adding NOP phi() at start of @1
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Adding NOP phi() at start of @end
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Adding NOP phi() at start of main
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FINAL CONTROL FLOW GRAPH
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@begin: scope:[] from
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[0] phi()
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to:@1
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@1: scope:[] from @begin
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[1] phi()
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[2] call main
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to:@end
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@end: scope:[] from @1
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[3] phi()
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(void()) main()
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main: scope:[main] from @1
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[4] phi()
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to:main::@1
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main::@1: scope:[main] from main main::@1
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[5] (byte*) main::msg#4 ← phi( main/(const byte*) MESSAGE main::@1/(byte*) main::msg#1 )
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[6] (byte~) main::$0 ← *((byte*) main::msg#4)
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[7] (byte*) main::msg#1 ← ++ (byte*) main::msg#4
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[8] if((byte) 0!=(byte~) main::$0) goto main::@1
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to:main::@2
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main::@2: scope:[main] from main::@1
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[9] (byte*) main::msg#2 ← -- (byte*) main::msg#1
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[10] *((byte*) main::msg#2) ← (byte) 'x'
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[11] (byte*) main::msg#3 ← ++ (byte*) main::msg#2
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[12] *((byte*) main::msg#3) ← (byte) 0
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to:main::@3
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main::@3: scope:[main] from main::@2 main::@4
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[13] (byte) main::i#2 ← phi( main::@2/(byte) 0 main::@4/(byte) main::i#1 )
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[14] if((byte) 0!=*((const byte*) MESSAGE + (byte) main::i#2)) goto main::@4
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to:main::@return
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main::@return: scope:[main] from main::@3
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[15] return
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to:@return
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main::@4: scope:[main] from main::@3
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[16] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) MESSAGE + (byte) main::i#2)
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[17] (byte) main::i#1 ← ++ (byte) main::i#2
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to:main::@3
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VARIABLE REGISTER WEIGHTS
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(void()) main()
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(byte~) main::$0 101.0
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(byte) main::i
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(byte) main::i#1 202.0
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(byte) main::i#2 168.33333333333331
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(byte*) main::msg
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(byte*) main::msg#1 106.5
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(byte*) main::msg#2 16.5
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(byte*) main::msg#3 22.0
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(byte*) main::msg#4 151.5
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Initial phi equivalence classes
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[ main::msg#4 main::msg#1 ]
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[ main::i#2 main::i#1 ]
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Added variable main::$0 to live range equivalence class [ main::$0 ]
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Added variable main::msg#2 to live range equivalence class [ main::msg#2 ]
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Added variable main::msg#3 to live range equivalence class [ main::msg#3 ]
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Complete equivalence classes
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[ main::msg#4 main::msg#1 ]
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[ main::i#2 main::i#1 ]
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[ main::$0 ]
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[ main::msg#2 ]
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[ main::msg#3 ]
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Allocated zp[2]:2 [ main::msg#4 main::msg#1 ]
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Allocated zp[1]:4 [ main::i#2 main::i#1 ]
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Allocated zp[1]:5 [ main::$0 ]
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Allocated zp[2]:6 [ main::msg#2 ]
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Allocated zp[2]:8 [ main::msg#3 ]
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INITIAL ASM
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Target platform is c64basic / MOS6502X
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// File Comments
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// Illustrates a problem with post-incrementing a pointer used in a loop comparison
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// Upstart
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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// Global Constants & labels
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.label SCREEN = $400
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// @begin
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__bbegin:
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// [1] phi from @begin to @1 [phi:@begin->@1]
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__b1_from___bbegin:
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jmp __b1
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// @1
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__b1:
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// [2] call main
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// [4] phi from @1 to main [phi:@1->main]
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main_from___b1:
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jsr main
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// [3] phi from @1 to @end [phi:@1->@end]
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__bend_from___b1:
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jmp __bend
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// @end
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__bend:
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// main
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main: {
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.label __0 = 5
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.label msg = 2
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.label msg_1 = 6
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.label msg_2 = 8
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// Print the resulting message - should be "camelotx" - but the error causes it to be "camelox"
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.label i = 4
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// [5] phi from main to main::@1 [phi:main->main::@1]
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__b1_from_main:
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// [5] phi (byte*) main::msg#4 = (const byte*) MESSAGE [phi:main->main::@1#0] -- pbuz1=pbuc1
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lda #<MESSAGE
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sta.z msg
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lda #>MESSAGE
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sta.z msg+1
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jmp __b1
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// Error! The post-increment in the following loop is turned into a pre-increment by the compiler.
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// [5] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
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__b1_from___b1:
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// [5] phi (byte*) main::msg#4 = (byte*) main::msg#1 [phi:main::@1->main::@1#0] -- register_copy
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jmp __b1
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// main::@1
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__b1:
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// [6] (byte~) main::$0 ← *((byte*) main::msg#4) -- vbuz1=_deref_pbuz2
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ldy #0
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lda (msg),y
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sta.z __0
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// [7] (byte*) main::msg#1 ← ++ (byte*) main::msg#4 -- pbuz1=_inc_pbuz1
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inc.z msg
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bne !+
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inc.z msg+1
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!:
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// [8] if((byte) 0!=(byte~) main::$0) goto main::@1 -- vbuc1_neq_vbuz1_then_la1
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lda #0
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cmp.z __0
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bne __b1_from___b1
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jmp __b2
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// main::@2
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__b2:
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// [9] (byte*) main::msg#2 ← -- (byte*) main::msg#1 -- pbuz1=_dec_pbuz2
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lda.z msg
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sec
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sbc #1
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sta.z msg_1
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lda.z msg+1
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sbc #0
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sta.z msg_1+1
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// [10] *((byte*) main::msg#2) ← (byte) 'x' -- _deref_pbuz1=vbuc1
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// Now msg should point right after the zero, since the post increment was executed in the last condition that evaluated to zero.
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lda #'x'
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ldy #0
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sta (msg_1),y
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// [11] (byte*) main::msg#3 ← ++ (byte*) main::msg#2 -- pbuz1=_inc_pbuz2
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lda.z msg_1
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clc
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adc #1
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sta.z msg_2
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lda.z msg_1+1
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adc #0
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sta.z msg_2+1
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// [12] *((byte*) main::msg#3) ← (byte) 0 -- _deref_pbuz1=vbuc1
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lda #0
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ldy #0
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sta (msg_2),y
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// [13] phi from main::@2 to main::@3 [phi:main::@2->main::@3]
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__b3_from___b2:
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// [13] phi (byte) main::i#2 = (byte) 0 [phi:main::@2->main::@3#0] -- vbuz1=vbuc1
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lda #0
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sta.z i
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jmp __b3
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// main::@3
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__b3:
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// [14] if((byte) 0!=*((const byte*) MESSAGE + (byte) main::i#2)) goto main::@4 -- vbuc1_neq_pbuc2_derefidx_vbuz1_then_la1
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lda #0
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ldy.z i
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cmp MESSAGE,y
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bne __b4
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jmp __breturn
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// main::@return
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__breturn:
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// [15] return
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rts
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// main::@4
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__b4:
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// [16] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) MESSAGE + (byte) main::i#2) -- pbuc1_derefidx_vbuz1=pbuc2_derefidx_vbuz1
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ldy.z i
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lda MESSAGE,y
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sta SCREEN,y
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// [17] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuz1=_inc_vbuz1
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inc.z i
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// [13] phi from main::@4 to main::@3 [phi:main::@4->main::@3]
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__b3_from___b4:
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// [13] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@4->main::@3#0] -- register_copy
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jmp __b3
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}
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// File Data
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MESSAGE: .text "camelot"
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.byte 0
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.fill $c, 0
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REGISTER UPLIFT POTENTIAL REGISTERS
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Statement [6] (byte~) main::$0 ← *((byte*) main::msg#4) [ main::msg#4 main::$0 ] ( main:2 [ main::msg#4 main::$0 ] { } ) always clobbers reg byte a reg byte y
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Statement [9] (byte*) main::msg#2 ← -- (byte*) main::msg#1 [ main::msg#2 ] ( main:2 [ main::msg#2 ] { } ) always clobbers reg byte a
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Statement [10] *((byte*) main::msg#2) ← (byte) 'x' [ main::msg#2 ] ( main:2 [ main::msg#2 ] { } ) always clobbers reg byte a reg byte y
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Statement [11] (byte*) main::msg#3 ← ++ (byte*) main::msg#2 [ main::msg#3 ] ( main:2 [ main::msg#3 ] { } ) always clobbers reg byte a
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Statement [12] *((byte*) main::msg#3) ← (byte) 0 [ ] ( main:2 [ ] { } ) always clobbers reg byte a reg byte y
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Statement [14] if((byte) 0!=*((const byte*) MESSAGE + (byte) main::i#2)) goto main::@4 [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
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Removing always clobbered register reg byte a as potential for zp[1]:4 [ main::i#2 main::i#1 ]
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Statement [16] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) MESSAGE + (byte) main::i#2) [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
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Statement [6] (byte~) main::$0 ← *((byte*) main::msg#4) [ main::msg#4 main::$0 ] ( main:2 [ main::msg#4 main::$0 ] { } ) always clobbers reg byte a reg byte y
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Statement [9] (byte*) main::msg#2 ← -- (byte*) main::msg#1 [ main::msg#2 ] ( main:2 [ main::msg#2 ] { } ) always clobbers reg byte a
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Statement [10] *((byte*) main::msg#2) ← (byte) 'x' [ main::msg#2 ] ( main:2 [ main::msg#2 ] { } ) always clobbers reg byte a reg byte y
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Statement [11] (byte*) main::msg#3 ← ++ (byte*) main::msg#2 [ main::msg#3 ] ( main:2 [ main::msg#3 ] { } ) always clobbers reg byte a
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Statement [12] *((byte*) main::msg#3) ← (byte) 0 [ ] ( main:2 [ ] { } ) always clobbers reg byte a reg byte y
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Statement [14] if((byte) 0!=*((const byte*) MESSAGE + (byte) main::i#2)) goto main::@4 [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
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Statement [16] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) MESSAGE + (byte) main::i#2) [ main::i#2 ] ( main:2 [ main::i#2 ] { } ) always clobbers reg byte a
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Potential registers zp[2]:2 [ main::msg#4 main::msg#1 ] : zp[2]:2 ,
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Potential registers zp[1]:4 [ main::i#2 main::i#1 ] : zp[1]:4 , reg byte x , reg byte y ,
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Potential registers zp[1]:5 [ main::$0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y ,
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Potential registers zp[2]:6 [ main::msg#2 ] : zp[2]:6 ,
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Potential registers zp[2]:8 [ main::msg#3 ] : zp[2]:8 ,
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REGISTER UPLIFT SCOPES
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Uplift Scope [main] 370.33: zp[1]:4 [ main::i#2 main::i#1 ] 258: zp[2]:2 [ main::msg#4 main::msg#1 ] 101: zp[1]:5 [ main::$0 ] 22: zp[2]:8 [ main::msg#3 ] 16.5: zp[2]:6 [ main::msg#2 ]
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Uplift Scope []
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Uplifting [main] best 824 combination reg byte x [ main::i#2 main::i#1 ] zp[2]:2 [ main::msg#4 main::msg#1 ] reg byte a [ main::$0 ] zp[2]:8 [ main::msg#3 ] zp[2]:6 [ main::msg#2 ]
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Uplifting [] best 824 combination
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Coalescing zero page register [ zp[2]:2 [ main::msg#4 main::msg#1 ] ] with [ zp[2]:6 [ main::msg#2 ] ] - score: 1
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Coalescing zero page register [ zp[2]:2 [ main::msg#4 main::msg#1 main::msg#2 ] ] with [ zp[2]:8 [ main::msg#3 ] ] - score: 1
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ASSEMBLER BEFORE OPTIMIZATION
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// File Comments
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// Illustrates a problem with post-incrementing a pointer used in a loop comparison
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// Upstart
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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// Global Constants & labels
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.label SCREEN = $400
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// @begin
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__bbegin:
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// [1] phi from @begin to @1 [phi:@begin->@1]
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__b1_from___bbegin:
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jmp __b1
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// @1
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__b1:
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// [2] call main
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// [4] phi from @1 to main [phi:@1->main]
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main_from___b1:
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jsr main
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// [3] phi from @1 to @end [phi:@1->@end]
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__bend_from___b1:
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jmp __bend
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// @end
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__bend:
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// main
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main: {
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.label msg = 2
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// [5] phi from main to main::@1 [phi:main->main::@1]
|
|
__b1_from_main:
|
|
// [5] phi (byte*) main::msg#4 = (const byte*) MESSAGE [phi:main->main::@1#0] -- pbuz1=pbuc1
|
|
lda #<MESSAGE
|
|
sta.z msg
|
|
lda #>MESSAGE
|
|
sta.z msg+1
|
|
jmp __b1
|
|
// Error! The post-increment in the following loop is turned into a pre-increment by the compiler.
|
|
// [5] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
|
|
__b1_from___b1:
|
|
// [5] phi (byte*) main::msg#4 = (byte*) main::msg#1 [phi:main::@1->main::@1#0] -- register_copy
|
|
jmp __b1
|
|
// main::@1
|
|
__b1:
|
|
// [6] (byte~) main::$0 ← *((byte*) main::msg#4) -- vbuaa=_deref_pbuz1
|
|
ldy #0
|
|
lda (msg),y
|
|
// [7] (byte*) main::msg#1 ← ++ (byte*) main::msg#4 -- pbuz1=_inc_pbuz1
|
|
inc.z msg
|
|
bne !+
|
|
inc.z msg+1
|
|
!:
|
|
// [8] if((byte) 0!=(byte~) main::$0) goto main::@1 -- vbuc1_neq_vbuaa_then_la1
|
|
cmp #0
|
|
bne __b1_from___b1
|
|
jmp __b2
|
|
// main::@2
|
|
__b2:
|
|
// [9] (byte*) main::msg#2 ← -- (byte*) main::msg#1 -- pbuz1=_dec_pbuz1
|
|
lda.z msg
|
|
bne !+
|
|
dec.z msg+1
|
|
!:
|
|
dec.z msg
|
|
// [10] *((byte*) main::msg#2) ← (byte) 'x' -- _deref_pbuz1=vbuc1
|
|
// Now msg should point right after the zero, since the post increment was executed in the last condition that evaluated to zero.
|
|
lda #'x'
|
|
ldy #0
|
|
sta (msg),y
|
|
// [11] (byte*) main::msg#3 ← ++ (byte*) main::msg#2 -- pbuz1=_inc_pbuz1
|
|
inc.z msg
|
|
bne !+
|
|
inc.z msg+1
|
|
!:
|
|
// [12] *((byte*) main::msg#3) ← (byte) 0 -- _deref_pbuz1=vbuc1
|
|
lda #0
|
|
ldy #0
|
|
sta (msg),y
|
|
// [13] phi from main::@2 to main::@3 [phi:main::@2->main::@3]
|
|
__b3_from___b2:
|
|
// [13] phi (byte) main::i#2 = (byte) 0 [phi:main::@2->main::@3#0] -- vbuxx=vbuc1
|
|
ldx #0
|
|
jmp __b3
|
|
// main::@3
|
|
__b3:
|
|
// [14] if((byte) 0!=*((const byte*) MESSAGE + (byte) main::i#2)) goto main::@4 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1
|
|
lda MESSAGE,x
|
|
cmp #0
|
|
bne __b4
|
|
jmp __breturn
|
|
// main::@return
|
|
__breturn:
|
|
// [15] return
|
|
rts
|
|
// main::@4
|
|
__b4:
|
|
// [16] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) MESSAGE + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuxx
|
|
lda MESSAGE,x
|
|
sta SCREEN,x
|
|
// [17] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx
|
|
inx
|
|
// [13] phi from main::@4 to main::@3 [phi:main::@4->main::@3]
|
|
__b3_from___b4:
|
|
// [13] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@4->main::@3#0] -- register_copy
|
|
jmp __b3
|
|
}
|
|
// File Data
|
|
MESSAGE: .text "camelot"
|
|
.byte 0
|
|
.fill $c, 0
|
|
|
|
ASSEMBLER OPTIMIZATIONS
|
|
Removing instruction jmp __b1
|
|
Removing instruction jmp __bend
|
|
Removing instruction jmp __b1
|
|
Removing instruction jmp __b2
|
|
Removing instruction jmp __b3
|
|
Removing instruction jmp __breturn
|
|
Succesful ASM optimization Pass5NextJumpElimination
|
|
Replacing instruction ldy #0 with TAY
|
|
Replacing label __b1_from___b1 with __b1
|
|
Removing instruction __b1_from___bbegin:
|
|
Removing instruction __b1:
|
|
Removing instruction main_from___b1:
|
|
Removing instruction __bend_from___b1:
|
|
Removing instruction __b1_from___b1:
|
|
Succesful ASM optimization Pass5RedundantLabelElimination
|
|
Removing instruction __bbegin:
|
|
Removing instruction __bend:
|
|
Removing instruction __b1_from_main:
|
|
Removing instruction __b2:
|
|
Removing instruction __b3_from___b2:
|
|
Removing instruction __breturn:
|
|
Removing instruction __b3_from___b4:
|
|
Succesful ASM optimization Pass5UnusedLabelElimination
|
|
Removing instruction jsr main
|
|
Succesful ASM optimization Pass5SkipBegin
|
|
Removing instruction jmp __b1
|
|
Succesful ASM optimization Pass5NextJumpElimination
|
|
Replacing instruction ldx #0 with TAX
|
|
|
|
FINAL SYMBOL TABLE
|
|
(label) @1
|
|
(label) @begin
|
|
(label) @end
|
|
(const byte*) MESSAGE[(number) $14] = (byte*) "camelot"
|
|
(const nomodify byte*) SCREEN = (byte*) 1024
|
|
(void()) main()
|
|
(byte~) main::$0 reg byte a 101.0
|
|
(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
|
|
(byte*) main::msg
|
|
(byte*) main::msg#1 msg zp[2]:2 106.5
|
|
(byte*) main::msg#2 msg zp[2]:2 16.5
|
|
(byte*) main::msg#3 msg zp[2]:2 22.0
|
|
(byte*) main::msg#4 msg zp[2]:2 151.5
|
|
|
|
zp[2]:2 [ main::msg#4 main::msg#1 main::msg#2 main::msg#3 ]
|
|
reg byte x [ main::i#2 main::i#1 ]
|
|
reg byte a [ main::$0 ]
|
|
|
|
|
|
FINAL ASSEMBLER
|
|
Score: 653
|
|
|
|
// File Comments
|
|
// Illustrates a problem with post-incrementing a pointer used in a loop comparison
|
|
// 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: {
|
|
.label msg = 2
|
|
// [5] phi from main to main::@1 [phi:main->main::@1]
|
|
// [5] phi (byte*) main::msg#4 = (const byte*) MESSAGE [phi:main->main::@1#0] -- pbuz1=pbuc1
|
|
lda #<MESSAGE
|
|
sta.z msg
|
|
lda #>MESSAGE
|
|
sta.z msg+1
|
|
// Error! The post-increment in the following loop is turned into a pre-increment by the compiler.
|
|
// [5] phi from main::@1 to main::@1 [phi:main::@1->main::@1]
|
|
// [5] phi (byte*) main::msg#4 = (byte*) main::msg#1 [phi:main::@1->main::@1#0] -- register_copy
|
|
// main::@1
|
|
__b1:
|
|
// while(*msg++)
|
|
// [6] (byte~) main::$0 ← *((byte*) main::msg#4) -- vbuaa=_deref_pbuz1
|
|
ldy #0
|
|
lda (msg),y
|
|
// [7] (byte*) main::msg#1 ← ++ (byte*) main::msg#4 -- pbuz1=_inc_pbuz1
|
|
inc.z msg
|
|
bne !+
|
|
inc.z msg+1
|
|
!:
|
|
// [8] if((byte) 0!=(byte~) main::$0) goto main::@1 -- vbuc1_neq_vbuaa_then_la1
|
|
cmp #0
|
|
bne __b1
|
|
// main::@2
|
|
// *--msg = 'x';
|
|
// [9] (byte*) main::msg#2 ← -- (byte*) main::msg#1 -- pbuz1=_dec_pbuz1
|
|
lda.z msg
|
|
bne !+
|
|
dec.z msg+1
|
|
!:
|
|
dec.z msg
|
|
// *--msg = 'x'
|
|
// [10] *((byte*) main::msg#2) ← (byte) 'x' -- _deref_pbuz1=vbuc1
|
|
// Now msg should point right after the zero, since the post increment was executed in the last condition that evaluated to zero.
|
|
lda #'x'
|
|
ldy #0
|
|
sta (msg),y
|
|
// *++msg = 0;
|
|
// [11] (byte*) main::msg#3 ← ++ (byte*) main::msg#2 -- pbuz1=_inc_pbuz1
|
|
inc.z msg
|
|
bne !+
|
|
inc.z msg+1
|
|
!:
|
|
// *++msg = 0
|
|
// [12] *((byte*) main::msg#3) ← (byte) 0 -- _deref_pbuz1=vbuc1
|
|
lda #0
|
|
tay
|
|
sta (msg),y
|
|
// [13] phi from main::@2 to main::@3 [phi:main::@2->main::@3]
|
|
// [13] phi (byte) main::i#2 = (byte) 0 [phi:main::@2->main::@3#0] -- vbuxx=vbuc1
|
|
tax
|
|
// main::@3
|
|
__b3:
|
|
// while(MESSAGE[i])
|
|
// [14] if((byte) 0!=*((const byte*) MESSAGE + (byte) main::i#2)) goto main::@4 -- vbuc1_neq_pbuc2_derefidx_vbuxx_then_la1
|
|
lda MESSAGE,x
|
|
cmp #0
|
|
bne __b4
|
|
// main::@return
|
|
// }
|
|
// [15] return
|
|
rts
|
|
// main::@4
|
|
__b4:
|
|
// SCREEN[i] = MESSAGE[i]
|
|
// [16] *((const nomodify byte*) SCREEN + (byte) main::i#2) ← *((const byte*) MESSAGE + (byte) main::i#2) -- pbuc1_derefidx_vbuxx=pbuc2_derefidx_vbuxx
|
|
lda MESSAGE,x
|
|
sta SCREEN,x
|
|
// i++;
|
|
// [17] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx
|
|
inx
|
|
// [13] phi from main::@4 to main::@3 [phi:main::@4->main::@3]
|
|
// [13] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@4->main::@3#0] -- register_copy
|
|
jmp __b3
|
|
}
|
|
// File Data
|
|
MESSAGE: .text "camelot"
|
|
.byte 0
|
|
.fill $c, 0
|
|
|