mirror of
https://gitlab.com/camelot/kickc.git
synced 2024-11-22 01:31:27 +00:00
Fixed problem where pointer addition and constant consolidation could produce error "Type inference case not handled byte* + byte*". Closes #669
This commit is contained in:
parent
0d2b08ef3b
commit
924e795c06
@ -3485,6 +3485,11 @@ public class TestProgramsFast extends TestPrograms {
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compileAndCompare("consolidate-constant-problem.c");
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}
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@Test
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public void testConsolidateConstantProblem2() throws IOException {
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compileAndCompare("consolidate-constant-problem-2.c");
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}
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@Test
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public void testConsolidateArrayIndexProblem() throws IOException {
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compileAndCompare("consolidate-array-index-problem.c");
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13
src/test/kc/consolidate-constant-problem-2.c
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13
src/test/kc/consolidate-constant-problem-2.c
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@ -0,0 +1,13 @@
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// Constant consolidation produces a byte* + byte* error
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char* const SCREEN = (char*)0x400;
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void main() {
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for(char COLS=0;COLS<2;COLS++) {
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char* sc = SCREEN + COLS*4 + 2;
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for(char i=0;i<4;i++)
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sc[i] = COLS;
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}
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}
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57
src/test/ref/consolidate-constant-problem-2.asm
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57
src/test/ref/consolidate-constant-problem-2.asm
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@ -0,0 +1,57 @@
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// Constant consolidation produces a byte* + byte* error
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// Commodore 64 PRG executable file
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.file [name="consolidate-constant-problem-2.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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.label SCREEN = $400
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.segment Code
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main: {
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.label __2 = 2
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.label sc = 2
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ldx #0
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__b1:
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// for(char COLS=0;COLS<2;COLS++)
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cpx #2
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bcc __b2
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// }
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rts
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__b2:
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// COLS*4
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txa
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asl
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asl
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// SCREEN + COLS*4
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clc
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adc #<SCREEN
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sta.z __2
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lda #>SCREEN
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adc #0
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sta.z __2+1
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// char* sc = SCREEN + COLS*4 + 2
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lda #2
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clc
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adc.z sc
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sta.z sc
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bcc !+
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inc.z sc+1
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!:
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ldy #0
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__b3:
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// for(char i=0;i<4;i++)
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cpy #4
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bcc __b4
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// for(char COLS=0;COLS<2;COLS++)
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inx
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jmp __b1
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__b4:
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// sc[i] = COLS
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txa
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sta (sc),y
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// for(char i=0;i<4;i++)
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iny
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jmp __b3
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}
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28
src/test/ref/consolidate-constant-problem-2.cfg
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28
src/test/ref/consolidate-constant-problem-2.cfg
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@ -0,0 +1,28 @@
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void main()
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main: scope:[main] from
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[0] phi()
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to:main::@1
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main::@1: scope:[main] from main main::@5
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[1] main::COLS#2 = phi( main/0, main::@5/main::COLS#1 )
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[2] if(main::COLS#2<2) goto main::@2
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to:main::@return
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main::@return: scope:[main] from main::@1
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[3] return
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to:@return
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main::@2: scope:[main] from main::@1
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[4] main::$1 = main::COLS#2 << 2
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[5] main::$2 = SCREEN + main::$1
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[6] main::sc#0 = main::$2 + 2
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to:main::@3
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main::@3: scope:[main] from main::@2 main::@4
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[7] main::i#2 = phi( main::@2/0, main::@4/main::i#1 )
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[8] if(main::i#2<4) goto main::@4
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to:main::@5
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main::@5: scope:[main] from main::@3
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[9] main::COLS#1 = ++ main::COLS#2
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to:main::@1
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main::@4: scope:[main] from main::@3
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[10] main::sc#0[main::i#2] = main::COLS#2
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[11] main::i#1 = ++ main::i#2
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to:main::@3
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431
src/test/ref/consolidate-constant-problem-2.log
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431
src/test/ref/consolidate-constant-problem-2.log
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@ -0,0 +1,431 @@
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CONTROL FLOW GRAPH SSA
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void main()
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main: scope:[main] from __start
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main::COLS#0 = 0
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to:main::@1
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main::@1: scope:[main] from main main::@5
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main::COLS#2 = phi( main/main::COLS#0, main::@5/main::COLS#1 )
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main::$0 = main::COLS#2 < 2
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if(main::$0) goto main::@2
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to:main::@return
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main::@2: scope:[main] from main::@1
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main::COLS#3 = phi( main::@1/main::COLS#2 )
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main::$1 = main::COLS#3 * 4
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main::$2 = SCREEN + main::$1
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main::$3 = main::$2 + 2
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main::sc#0 = main::$3
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main::i#0 = 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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main::sc#2 = phi( main::@2/main::sc#0, main::@4/main::sc#1 )
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main::COLS#6 = phi( main::@2/main::COLS#3, main::@4/main::COLS#4 )
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main::i#2 = phi( main::@2/main::i#0, main::@4/main::i#1 )
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main::$4 = main::i#2 < 4
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if(main::$4) goto main::@4
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to:main::@5
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main::@4: scope:[main] from main::@3
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main::i#3 = phi( main::@3/main::i#2 )
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main::sc#1 = phi( main::@3/main::sc#2 )
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main::COLS#4 = phi( main::@3/main::COLS#6 )
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main::sc#1[main::i#3] = main::COLS#4
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main::i#1 = ++ main::i#3
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to:main::@3
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main::@5: scope:[main] from main::@3
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main::COLS#5 = phi( main::@3/main::COLS#6 )
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main::COLS#1 = ++ main::COLS#5
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to:main::@1
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main::@return: scope:[main] from main::@1
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return
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to:@return
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void __start()
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__start: scope:[__start] from
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call main
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to:__start::@1
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__start::@1: scope:[__start] from __start
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to:__start::@return
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__start::@return: scope:[__start] from __start::@1
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return
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to:@return
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SYMBOL TABLE SSA
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constant byte* const SCREEN = (byte*)$400
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void __start()
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void main()
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bool~ main::$0
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number~ main::$1
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byte*~ main::$2
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byte*~ main::$3
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bool~ main::$4
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byte main::COLS
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byte main::COLS#0
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byte main::COLS#1
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byte main::COLS#2
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byte main::COLS#3
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byte main::COLS#4
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byte main::COLS#5
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byte main::COLS#6
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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::sc
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byte* main::sc#0
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byte* main::sc#1
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byte* main::sc#2
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Adding number conversion cast (unumber) 2 in main::$0 = main::COLS#2 < 2
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Adding number conversion cast (unumber) 4 in main::$1 = main::COLS#3 * 4
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Adding number conversion cast (unumber) main::$1 in main::$1 = main::COLS#3 * (unumber)4
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Adding number conversion cast (unumber) 2 in main::$3 = main::$2 + 2
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Adding number conversion cast (unumber) 4 in main::$4 = main::i#2 < 4
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Successful SSA optimization PassNAddNumberTypeConversions
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Simplifying constant pointer cast (byte*) 1024
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Simplifying constant integer cast 2
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Simplifying constant integer cast 4
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Simplifying constant integer cast 2
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Simplifying constant integer cast 4
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Successful SSA optimization PassNCastSimplification
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Finalized unsigned number type (byte) 2
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Finalized unsigned number type (byte) 4
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Finalized unsigned number type (byte) 2
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Finalized unsigned number type (byte) 4
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Successful SSA optimization PassNFinalizeNumberTypeConversions
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Inferred type updated to byte in main::$1 = main::COLS#3 * 4
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Alias main::COLS#2 = main::COLS#3
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Alias main::sc#0 = main::$3
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Alias main::COLS#4 = main::COLS#6 main::COLS#5
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Alias main::sc#1 = main::sc#2
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Alias main::i#2 = main::i#3
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Successful SSA optimization Pass2AliasElimination
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Identical Phi Values main::COLS#4 main::COLS#2
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Identical Phi Values main::sc#1 main::sc#0
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Successful SSA optimization Pass2IdenticalPhiElimination
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Simple Condition main::$0 [3] if(main::COLS#2<2) goto main::@2
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Simple Condition main::$4 [10] if(main::i#2<4) goto main::@4
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Successful SSA optimization Pass2ConditionalJumpSimplification
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Constant main::COLS#0 = 0
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Constant main::i#0 = 0
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Successful SSA optimization Pass2ConstantIdentification
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Removing unused procedure __start
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Removing unused procedure block __start
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Removing unused procedure block __start::@1
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Removing unused procedure block __start::@return
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Successful SSA optimization PassNEliminateEmptyStart
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Rewriting multiplication to use shift [2] main::$1 = main::COLS#2 * 4
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Successful SSA optimization Pass2MultiplyToShiftRewriting
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Inlining constant with var siblings main::COLS#0
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Inlining constant with var siblings main::i#0
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Constant inlined main::COLS#0 = 0
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Constant inlined main::i#0 = 0
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Successful SSA optimization Pass2ConstantInlining
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Adding NOP phi() at start of main
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CALL GRAPH
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Created 2 initial phi equivalence classes
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Coalesced [10] main::COLS#7 = main::COLS#1
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Coalesced [13] main::i#4 = main::i#1
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Coalesced down to 2 phi equivalence classes
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Adding NOP phi() at start of main
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FINAL CONTROL FLOW GRAPH
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void main()
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main: scope:[main] from
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[0] phi()
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to:main::@1
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main::@1: scope:[main] from main main::@5
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[1] main::COLS#2 = phi( main/0, main::@5/main::COLS#1 )
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[2] if(main::COLS#2<2) goto main::@2
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to:main::@return
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main::@return: scope:[main] from main::@1
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[3] return
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to:@return
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main::@2: scope:[main] from main::@1
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[4] main::$1 = main::COLS#2 << 2
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[5] main::$2 = SCREEN + main::$1
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[6] main::sc#0 = main::$2 + 2
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to:main::@3
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main::@3: scope:[main] from main::@2 main::@4
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[7] main::i#2 = phi( main::@2/0, main::@4/main::i#1 )
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[8] if(main::i#2<4) goto main::@4
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to:main::@5
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main::@5: scope:[main] from main::@3
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[9] main::COLS#1 = ++ main::COLS#2
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to:main::@1
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main::@4: scope:[main] from main::@3
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[10] main::sc#0[main::i#2] = main::COLS#2
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[11] main::i#1 = ++ 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::$1 22.0
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byte*~ main::$2 22.0
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byte main::COLS
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byte main::COLS#1 22.0
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byte main::COLS#2 16.11111111111111
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byte main::i
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byte main::i#1 202.0
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byte main::i#2 134.66666666666666
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byte* main::sc
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byte* main::sc#0 22.4
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Initial phi equivalence classes
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[ main::COLS#2 main::COLS#1 ]
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[ main::i#2 main::i#1 ]
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Added variable main::$1 to live range equivalence class [ main::$1 ]
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Added variable main::$2 to live range equivalence class [ main::$2 ]
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Added variable main::sc#0 to live range equivalence class [ main::sc#0 ]
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Complete equivalence classes
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[ main::COLS#2 main::COLS#1 ]
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[ main::i#2 main::i#1 ]
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[ main::$1 ]
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[ main::$2 ]
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[ main::sc#0 ]
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Allocated zp[1]:2 [ main::COLS#2 main::COLS#1 ]
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Allocated zp[1]:3 [ main::i#2 main::i#1 ]
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Allocated zp[1]:4 [ main::$1 ]
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Allocated zp[2]:5 [ main::$2 ]
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Allocated zp[2]:7 [ main::sc#0 ]
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REGISTER UPLIFT POTENTIAL REGISTERS
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Statement [4] main::$1 = main::COLS#2 << 2 [ main::COLS#2 main::$1 ] ( [ main::COLS#2 main::$1 ] { } ) always clobbers reg byte a
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Removing always clobbered register reg byte a as potential for zp[1]:2 [ main::COLS#2 main::COLS#1 ]
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Statement [5] main::$2 = SCREEN + main::$1 [ main::COLS#2 main::$2 ] ( [ main::COLS#2 main::$2 ] { } ) always clobbers reg byte a
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Statement [6] main::sc#0 = main::$2 + 2 [ main::COLS#2 main::sc#0 ] ( [ main::COLS#2 main::sc#0 ] { } ) always clobbers reg byte a
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Statement [10] main::sc#0[main::i#2] = main::COLS#2 [ main::COLS#2 main::sc#0 main::i#2 ] ( [ main::COLS#2 main::sc#0 main::i#2 ] { } ) always clobbers reg byte a
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Removing always clobbered register reg byte a as potential for zp[1]:3 [ main::i#2 main::i#1 ]
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Statement [4] main::$1 = main::COLS#2 << 2 [ main::COLS#2 main::$1 ] ( [ main::COLS#2 main::$1 ] { } ) always clobbers reg byte a
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Statement [5] main::$2 = SCREEN + main::$1 [ main::COLS#2 main::$2 ] ( [ main::COLS#2 main::$2 ] { } ) always clobbers reg byte a
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Statement [6] main::sc#0 = main::$2 + 2 [ main::COLS#2 main::sc#0 ] ( [ main::COLS#2 main::sc#0 ] { } ) always clobbers reg byte a
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Statement [10] main::sc#0[main::i#2] = main::COLS#2 [ main::COLS#2 main::sc#0 main::i#2 ] ( [ main::COLS#2 main::sc#0 main::i#2 ] { } ) always clobbers reg byte a
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Potential registers zp[1]:2 [ main::COLS#2 main::COLS#1 ] : zp[1]:2 , reg byte x , reg byte y ,
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Potential registers zp[1]:3 [ main::i#2 main::i#1 ] : zp[1]:3 , reg byte x , reg byte y ,
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Potential registers zp[1]:4 [ main::$1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y ,
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Potential registers zp[2]:5 [ main::$2 ] : zp[2]:5 ,
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Potential registers zp[2]:7 [ main::sc#0 ] : zp[2]:7 ,
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REGISTER UPLIFT SCOPES
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Uplift Scope [main] 336.67: zp[1]:3 [ main::i#2 main::i#1 ] 38.11: zp[1]:2 [ main::COLS#2 main::COLS#1 ] 22.4: zp[2]:7 [ main::sc#0 ] 22: zp[1]:4 [ main::$1 ] 22: zp[2]:5 [ main::$2 ]
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Uplift Scope []
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Uplifting [main] best 3111 combination reg byte y [ main::i#2 main::i#1 ] reg byte x [ main::COLS#2 main::COLS#1 ] zp[2]:7 [ main::sc#0 ] reg byte a [ main::$1 ] zp[2]:5 [ main::$2 ]
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Uplifting [] best 3111 combination
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Coalescing zero page register [ zp[2]:5 [ main::$2 ] ] with [ zp[2]:7 [ main::sc#0 ] ] - score: 1
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Allocated (was zp[2]:5) zp[2]:2 [ main::$2 main::sc#0 ]
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ASSEMBLER BEFORE OPTIMIZATION
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// File Comments
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// Constant consolidation produces a byte* + byte* error
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// Upstart
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// Commodore 64 PRG executable file
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.file [name="consolidate-constant-problem-2.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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// Global Constants & labels
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.label SCREEN = $400
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.segment Code
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// main
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main: {
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.label __2 = 2
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.label sc = 2
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// [1] phi from main to main::@1 [phi:main->main::@1]
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__b1_from_main:
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// [1] phi main::COLS#2 = 0 [phi:main->main::@1#0] -- vbuxx=vbuc1
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ldx #0
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jmp __b1
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// main::@1
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__b1:
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// [2] if(main::COLS#2<2) goto main::@2 -- vbuxx_lt_vbuc1_then_la1
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cpx #2
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bcc __b2
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jmp __breturn
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// main::@return
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__breturn:
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// [3] return
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rts
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// main::@2
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__b2:
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// [4] main::$1 = main::COLS#2 << 2 -- vbuaa=vbuxx_rol_2
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txa
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asl
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asl
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// [5] main::$2 = SCREEN + main::$1 -- pbuz1=pbuc1_plus_vbuaa
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clc
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adc #<SCREEN
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sta.z __2
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lda #>SCREEN
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adc #0
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sta.z __2+1
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// [6] main::sc#0 = main::$2 + 2 -- pbuz1=pbuz1_plus_vbuc1
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lda #2
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clc
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adc.z sc
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sta.z sc
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bcc !+
|
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inc.z sc+1
|
||||
!:
|
||||
// [7] phi from main::@2 to main::@3 [phi:main::@2->main::@3]
|
||||
__b3_from___b2:
|
||||
// [7] phi main::i#2 = 0 [phi:main::@2->main::@3#0] -- vbuyy=vbuc1
|
||||
ldy #0
|
||||
jmp __b3
|
||||
// main::@3
|
||||
__b3:
|
||||
// [8] if(main::i#2<4) goto main::@4 -- vbuyy_lt_vbuc1_then_la1
|
||||
cpy #4
|
||||
bcc __b4
|
||||
jmp __b5
|
||||
// main::@5
|
||||
__b5:
|
||||
// [9] main::COLS#1 = ++ main::COLS#2 -- vbuxx=_inc_vbuxx
|
||||
inx
|
||||
// [1] phi from main::@5 to main::@1 [phi:main::@5->main::@1]
|
||||
__b1_from___b5:
|
||||
// [1] phi main::COLS#2 = main::COLS#1 [phi:main::@5->main::@1#0] -- register_copy
|
||||
jmp __b1
|
||||
// main::@4
|
||||
__b4:
|
||||
// [10] main::sc#0[main::i#2] = main::COLS#2 -- pbuz1_derefidx_vbuyy=vbuxx
|
||||
txa
|
||||
sta (sc),y
|
||||
// [11] main::i#1 = ++ main::i#2 -- vbuyy=_inc_vbuyy
|
||||
iny
|
||||
// [7] phi from main::@4 to main::@3 [phi:main::@4->main::@3]
|
||||
__b3_from___b4:
|
||||
// [7] phi main::i#2 = main::i#1 [phi:main::@4->main::@3#0] -- register_copy
|
||||
jmp __b3
|
||||
}
|
||||
// File Data
|
||||
|
||||
ASSEMBLER OPTIMIZATIONS
|
||||
Removing instruction jmp __b1
|
||||
Removing instruction jmp __breturn
|
||||
Removing instruction jmp __b3
|
||||
Removing instruction jmp __b5
|
||||
Succesful ASM optimization Pass5NextJumpElimination
|
||||
Removing instruction __b1_from_main:
|
||||
Removing instruction __breturn:
|
||||
Removing instruction __b3_from___b2:
|
||||
Removing instruction __b5:
|
||||
Removing instruction __b1_from___b5:
|
||||
Removing instruction __b3_from___b4:
|
||||
Succesful ASM optimization Pass5UnusedLabelElimination
|
||||
|
||||
FINAL SYMBOL TABLE
|
||||
constant byte* const SCREEN = (byte*) 1024
|
||||
void main()
|
||||
byte~ main::$1 reg byte a 22.0
|
||||
byte*~ main::$2 zp[2]:2 22.0
|
||||
byte main::COLS
|
||||
byte main::COLS#1 reg byte x 22.0
|
||||
byte main::COLS#2 reg byte x 16.11111111111111
|
||||
byte main::i
|
||||
byte main::i#1 reg byte y 202.0
|
||||
byte main::i#2 reg byte y 134.66666666666666
|
||||
byte* main::sc
|
||||
byte* main::sc#0 sc zp[2]:2 22.4
|
||||
|
||||
reg byte x [ main::COLS#2 main::COLS#1 ]
|
||||
reg byte y [ main::i#2 main::i#1 ]
|
||||
reg byte a [ main::$1 ]
|
||||
zp[2]:2 [ main::$2 main::sc#0 ]
|
||||
|
||||
|
||||
FINAL ASSEMBLER
|
||||
Score: 2446
|
||||
|
||||
// File Comments
|
||||
// Constant consolidation produces a byte* + byte* error
|
||||
// Upstart
|
||||
// Commodore 64 PRG executable file
|
||||
.file [name="consolidate-constant-problem-2.prg", type="prg", segments="Program"]
|
||||
.segmentdef Program [segments="Basic, Code, Data"]
|
||||
.segmentdef Basic [start=$0801]
|
||||
.segmentdef Code [start=$80d]
|
||||
.segmentdef Data [startAfter="Code"]
|
||||
.segment Basic
|
||||
:BasicUpstart(main)
|
||||
// Global Constants & labels
|
||||
.label SCREEN = $400
|
||||
.segment Code
|
||||
// main
|
||||
main: {
|
||||
.label __2 = 2
|
||||
.label sc = 2
|
||||
// [1] phi from main to main::@1 [phi:main->main::@1]
|
||||
// [1] phi main::COLS#2 = 0 [phi:main->main::@1#0] -- vbuxx=vbuc1
|
||||
ldx #0
|
||||
// main::@1
|
||||
__b1:
|
||||
// for(char COLS=0;COLS<2;COLS++)
|
||||
// [2] if(main::COLS#2<2) goto main::@2 -- vbuxx_lt_vbuc1_then_la1
|
||||
cpx #2
|
||||
bcc __b2
|
||||
// main::@return
|
||||
// }
|
||||
// [3] return
|
||||
rts
|
||||
// main::@2
|
||||
__b2:
|
||||
// COLS*4
|
||||
// [4] main::$1 = main::COLS#2 << 2 -- vbuaa=vbuxx_rol_2
|
||||
txa
|
||||
asl
|
||||
asl
|
||||
// SCREEN + COLS*4
|
||||
// [5] main::$2 = SCREEN + main::$1 -- pbuz1=pbuc1_plus_vbuaa
|
||||
clc
|
||||
adc #<SCREEN
|
||||
sta.z __2
|
||||
lda #>SCREEN
|
||||
adc #0
|
||||
sta.z __2+1
|
||||
// char* sc = SCREEN + COLS*4 + 2
|
||||
// [6] main::sc#0 = main::$2 + 2 -- pbuz1=pbuz1_plus_vbuc1
|
||||
lda #2
|
||||
clc
|
||||
adc.z sc
|
||||
sta.z sc
|
||||
bcc !+
|
||||
inc.z sc+1
|
||||
!:
|
||||
// [7] phi from main::@2 to main::@3 [phi:main::@2->main::@3]
|
||||
// [7] phi main::i#2 = 0 [phi:main::@2->main::@3#0] -- vbuyy=vbuc1
|
||||
ldy #0
|
||||
// main::@3
|
||||
__b3:
|
||||
// for(char i=0;i<4;i++)
|
||||
// [8] if(main::i#2<4) goto main::@4 -- vbuyy_lt_vbuc1_then_la1
|
||||
cpy #4
|
||||
bcc __b4
|
||||
// main::@5
|
||||
// for(char COLS=0;COLS<2;COLS++)
|
||||
// [9] main::COLS#1 = ++ main::COLS#2 -- vbuxx=_inc_vbuxx
|
||||
inx
|
||||
// [1] phi from main::@5 to main::@1 [phi:main::@5->main::@1]
|
||||
// [1] phi main::COLS#2 = main::COLS#1 [phi:main::@5->main::@1#0] -- register_copy
|
||||
jmp __b1
|
||||
// main::@4
|
||||
__b4:
|
||||
// sc[i] = COLS
|
||||
// [10] main::sc#0[main::i#2] = main::COLS#2 -- pbuz1_derefidx_vbuyy=vbuxx
|
||||
txa
|
||||
sta (sc),y
|
||||
// for(char i=0;i<4;i++)
|
||||
// [11] main::i#1 = ++ main::i#2 -- vbuyy=_inc_vbuyy
|
||||
iny
|
||||
// [7] phi from main::@4 to main::@3 [phi:main::@4->main::@3]
|
||||
// [7] phi main::i#2 = main::i#1 [phi:main::@4->main::@3#0] -- register_copy
|
||||
jmp __b3
|
||||
}
|
||||
// File Data
|
||||
|
17
src/test/ref/consolidate-constant-problem-2.sym
Normal file
17
src/test/ref/consolidate-constant-problem-2.sym
Normal file
@ -0,0 +1,17 @@
|
||||
constant byte* const SCREEN = (byte*) 1024
|
||||
void main()
|
||||
byte~ main::$1 reg byte a 22.0
|
||||
byte*~ main::$2 zp[2]:2 22.0
|
||||
byte main::COLS
|
||||
byte main::COLS#1 reg byte x 22.0
|
||||
byte main::COLS#2 reg byte x 16.11111111111111
|
||||
byte main::i
|
||||
byte main::i#1 reg byte y 202.0
|
||||
byte main::i#2 reg byte y 134.66666666666666
|
||||
byte* main::sc
|
||||
byte* main::sc#0 sc zp[2]:2 22.4
|
||||
|
||||
reg byte x [ main::COLS#2 main::COLS#1 ]
|
||||
reg byte y [ main::i#2 main::i#1 ]
|
||||
reg byte a [ main::$1 ]
|
||||
zp[2]:2 [ main::$2 main::sc#0 ]
|
Loading…
Reference in New Issue
Block a user