mirror of
https://gitlab.com/camelot/kickc.git
synced 2024-09-08 17:54:40 +00:00
Implemented constant pointer detection - allowing for efficient NULL-code using const byte* NULL = $00. Closes #79
This commit is contained in:
jespergravgaard
parent
43395567af
commit
c8edee4291
10
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.asm
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10
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.asm
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@ -0,0 +1,10 @@
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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jsr main
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main: {
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.label screen = $400
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lda #'*'
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sta screen+0
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rts
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}
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18
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.cfg
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18
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.cfg
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@ -0,0 +1,18 @@
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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 param-assignment [ ] ( )
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to:@end
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@end: scope:[] from @1
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[3] phi() [ ] ( )
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main: scope:[main] from @1
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[4] phi() [ ] ( main:2 [ ] )
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to:main::@1
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main::@1: scope:[main] from main
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[5] *((const byte*) main::screen#0+(byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*' [ ] ( main:2 [ ] )
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to:main::@return
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main::@return: scope:[main] from main::@1
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[6] return [ ] ( main:2 [ ] )
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to:@return
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343
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.log
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343
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.log
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@ -0,0 +1,343 @@
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PARSING src/test/java/dk/camelot64/kickc/test/kc/const-pointer.kc
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//Test that constant pointers are detected correctly
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void main() {
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byte* screen = $400;
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byte* NULL = $0;
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byte* rem = $ff;
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if(rem!=NULL) {
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screen[0] = '*';
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} else {
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screen[0] = '.';
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}
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}
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SYMBOLS
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(label) @1
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(label) @begin
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(label) @end
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(void()) main()
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(boolean~) main::$0
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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::NULL
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(byte*) main::rem
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(byte*) main::screen
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Promoting word/signed word/dword/signed dword to byte* in main::screen ← ((byte*)) 1024
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Promoting byte/signed byte/word/signed word/dword/signed dword to byte* in main::NULL ← ((byte*)) 0
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Promoting byte/word/signed word/dword/signed dword to byte* in main::rem ← ((byte*)) 255
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INITIAL CONTROL FLOW GRAPH
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@begin: scope:[] from
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to:@1
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main: scope:[main] from
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(byte*) main::screen ← ((byte*)) (word/signed word/dword/signed dword) 1024
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(byte*) main::NULL ← ((byte*)) (byte/signed byte/word/signed word/dword/signed dword) 0
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(byte*) main::rem ← ((byte*)) (byte/word/signed word/dword/signed dword) 255
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(boolean~) main::$0 ← (byte*) main::rem != (byte*) main::NULL
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if((boolean~) main::$0) goto main::@1
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to:main::@3
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main::@1: scope:[main] from main main::@4
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*((byte*) main::screen + (byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*'
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to:main::@2
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main::@3: scope:[main] from main
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*((byte*) main::screen + (byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '.'
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to:main::@2
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main::@2: scope:[main] from main::@1 main::@3
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to:main::@return
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main::@4: scope:[main] from
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to:main::@1
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main::@return: scope:[main] from main::@2
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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:@end
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@end: scope:[] from @1
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Removing empty block main::@2
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Removing empty block main::@4
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PROCEDURE MODIFY VARIABLE ANALYSIS
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Completing Phi functions...
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CONTROL FLOW GRAPH SSA WITH ASSIGNMENT CALL & RETURN
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@begin: scope:[] from
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to:@1
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main: scope:[main] from @1
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(byte*) main::screen#0 ← ((byte*)) (word/signed word/dword/signed dword) 1024
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(byte*) main::NULL#0 ← ((byte*)) (byte/signed byte/word/signed word/dword/signed dword) 0
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(byte*) main::rem#0 ← ((byte*)) (byte/word/signed word/dword/signed dword) 255
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(boolean~) main::$0 ← (byte*) main::rem#0 != (byte*) main::NULL#0
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if((boolean~) main::$0) goto main::@1
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to:main::@3
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main::@1: scope:[main] from main
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(byte*) main::screen#1 ← phi( main/(byte*) main::screen#0 )
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*((byte*) main::screen#1 + (byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*'
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to:main::@return
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main::@3: scope:[main] from main
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(byte*) main::screen#2 ← phi( main/(byte*) main::screen#0 )
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*((byte*) main::screen#2 + (byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '.'
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to:main::@return
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main::@return: scope:[main] from main::@1 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 param-assignment
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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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(void()) main()
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(boolean~) main::$0
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(label) main::@1
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(label) main::@3
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(label) main::@return
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(byte*) main::NULL
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(byte*) main::NULL#0
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(byte*) main::rem
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(byte*) main::rem#0
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(byte*) main::screen
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(byte*) main::screen#0
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(byte*) main::screen#1
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(byte*) main::screen#2
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OPTIMIZING CONTROL FLOW GRAPH
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Culled Empty Block (label) @2
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Succesful SSA optimization Pass2CullEmptyBlocks
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Alias (byte*) main::screen#0 = (byte*) main::screen#1 (byte*) main::screen#2
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Succesful SSA optimization Pass2AliasElimination
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Simple Condition (boolean~) main::$0 if((byte*) main::rem#0!=(byte*) main::NULL#0) goto main::@1
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Succesful SSA optimization Pass2ConditionalJumpSimplification
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Constant (const byte*) main::screen#0 = ((byte*))1024
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Constant (const byte*) main::NULL#0 = ((byte*))0
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Constant (const byte*) main::rem#0 = ((byte*))255
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Succesful SSA optimization Pass2ConstantIdentification
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Consolidated array index constant in *(main::screen#0+0)
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Consolidated array index constant in *(main::screen#0+0)
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Succesful SSA optimization Pass2ConstantAdditionElimination
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if() condition always true - replacing block destination if((const byte*) main::rem#0!=(const byte*) main::NULL#0) goto main::@1
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Succesful SSA optimization Pass2ConstantIfs
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Eliminating unused constant (const byte*) main::NULL#0
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Eliminating unused constant (const byte*) main::rem#0
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Succesful SSA optimization PassNEliminateUnusedVars
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Removing unused block main::@3
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Succesful SSA optimization Pass2EliminateUnusedBlocks
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OPTIMIZING CONTROL FLOW GRAPH
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Block Sequence Planned @begin @1 @end main main::@1 main::@return
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Block Sequence Planned @begin @1 @end main main::@1 main::@return
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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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CALL GRAPH
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Calls in [] to main:2
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Propagating live ranges...
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Created 0 initial phi equivalence classes
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Coalesced down to 0 phi equivalence classes
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Block Sequence Planned @begin @1 @end main main::@1 main::@return
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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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Propagating live ranges...
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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 param-assignment [ ] ( )
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to:@end
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@end: scope:[] from @1
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[3] phi() [ ] ( )
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main: scope:[main] from @1
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[4] phi() [ ] ( main:2 [ ] )
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to:main::@1
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main::@1: scope:[main] from main
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[5] *((const byte*) main::screen#0+(byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*' [ ] ( main:2 [ ] )
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to:main::@return
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main::@return: scope:[main] from main::@1
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[6] return [ ] ( main:2 [ ] )
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to:@return
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DOMINATORS
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@begin dominated by @begin
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@1 dominated by @1 @begin
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@end dominated by @1 @begin @end
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main dominated by @1 @begin main
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main::@1 dominated by @1 @begin main::@1 main
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main::@return dominated by main::@return @1 @begin main::@1 main
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NATURAL LOOPS
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NATURAL LOOPS WITH DEPTH
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Found 0 loops in scope []
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Found 0 loops in scope [main]
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VARIABLE REGISTER WEIGHTS
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(void()) main()
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(byte*) main::NULL
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(byte*) main::rem
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(byte*) main::screen
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Initial phi equivalence classes
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Complete equivalence classes
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INITIAL ASM
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//SEG0 Basic 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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//SEG1 Global Constants & labels
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//SEG2 @begin
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bbegin:
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//SEG3 [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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//SEG4 @1
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b1:
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//SEG5 [2] call main param-assignment [ ] ( )
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//SEG6 [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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//SEG7 [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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//SEG8 @end
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bend:
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//SEG9 main
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main: {
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.label screen = $400
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jmp b1
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//SEG10 main::@1
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b1:
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//SEG11 [5] *((const byte*) main::screen#0+(byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*' [ ] ( main:2 [ ] ) -- _deref_pbuc1=vbuc2
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lda #'*'
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sta screen+0
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jmp breturn
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//SEG12 main::@return
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breturn:
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//SEG13 [6] return [ ] ( main:2 [ ] )
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rts
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}
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REGISTER UPLIFT POTENTIAL REGISTERS
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Statement [5] *((const byte*) main::screen#0+(byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*' [ ] ( main:2 [ ] ) always clobbers reg byte a
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REGISTER UPLIFT SCOPES
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Uplift Scope [main]
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Uplift Scope []
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Uplifting [main] best 57 combination
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Uplifting [] best 57 combination
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ASSEMBLER BEFORE OPTIMIZATION
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//SEG0 Basic 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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//SEG1 Global Constants & labels
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//SEG2 @begin
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bbegin:
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//SEG3 [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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//SEG4 @1
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b1:
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//SEG5 [2] call main param-assignment [ ] ( )
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//SEG6 [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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//SEG7 [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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//SEG8 @end
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bend:
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//SEG9 main
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main: {
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.label screen = $400
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jmp b1
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//SEG10 main::@1
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b1:
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//SEG11 [5] *((const byte*) main::screen#0+(byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*' [ ] ( main:2 [ ] ) -- _deref_pbuc1=vbuc2
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lda #'*'
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sta screen+0
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jmp breturn
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//SEG12 main::@return
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breturn:
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//SEG13 [6] return [ ] ( main:2 [ ] )
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rts
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}
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ASSEMBLER OPTIMIZATIONS
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Removing instruction jmp b1
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Removing instruction jmp bend
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Removing instruction jmp b1
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Removing instruction jmp breturn
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Succesful ASM optimization Pass5NextJumpElimination
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Removing instruction bbegin:
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Removing instruction b1_from_bbegin:
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Removing instruction main_from_b1:
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Removing instruction bend_from_b1:
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Succesful ASM optimization Pass5RedundantLabelElimination
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Removing instruction b1:
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Removing instruction bend:
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Removing instruction b1:
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Removing instruction breturn:
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Succesful ASM optimization Pass5UnusedLabelElimination
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FINAL SYMBOL TABLE
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(label) @1
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(label) @begin
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(label) @end
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(void()) main()
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(label) main::@1
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(label) main::@return
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(byte*) main::NULL
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(byte*) main::rem
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(byte*) main::screen
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(const byte*) main::screen#0 screen = ((byte*))(word/signed word/dword/signed dword) 1024
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FINAL ASSEMBLER
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Score: 18
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//SEG0 Basic 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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//SEG1 Global Constants & labels
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//SEG2 @begin
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//SEG3 [1] phi from @begin to @1 [phi:@begin->@1]
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//SEG4 @1
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//SEG5 [2] call main param-assignment [ ] ( )
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//SEG6 [4] phi from @1 to main [phi:@1->main]
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jsr main
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//SEG7 [3] phi from @1 to @end [phi:@1->@end]
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//SEG8 @end
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//SEG9 main
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main: {
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.label screen = $400
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//SEG10 main::@1
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//SEG11 [5] *((const byte*) main::screen#0+(byte/signed byte/word/signed word/dword/signed dword) 0) ← (byte) '*' [ ] ( main:2 [ ] ) -- _deref_pbuc1=vbuc2
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lda #'*'
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sta screen+0
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//SEG12 main::@return
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//SEG13 [6] return [ ] ( main:2 [ ] )
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rts
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}
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11
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.sym
Normal file
11
src/test/java/dk/camelot64/kickc/test/ref/const-pointer.sym
Normal file
@ -0,0 +1,11 @@
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(label) @1
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(label) @begin
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(label) @end
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(void()) main()
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(label) main::@1
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(label) main::@return
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(byte*) main::NULL
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(byte*) main::rem
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(byte*) main::screen
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(const byte*) main::screen#0 screen = ((byte*))(word/signed word/dword/signed dword) 1024
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