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Working on classic unions - return values. #197

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This commit is contained in:
jespergravgaard 2021-07-27 23:20:25 +02:00
parent cf44674bee
commit e528f44570
8 changed files with 610 additions and 11 deletions
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31
src/main/java/dk/camelot64/kickc/passes/Pass1UnwindStructValues.java
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@ -5,6 +5,7 @@ import dk.camelot64.kickc.model.*;
import dk.camelot64.kickc.model.iterator.ProgramValueIterator;
import dk.camelot64.kickc.model.statements.*;
import dk.camelot64.kickc.model.symbols.Procedure;
import dk.camelot64.kickc.model.symbols.StructDefinition;
import dk.camelot64.kickc.model.symbols.Variable;
import dk.camelot64.kickc.model.types.SymbolType;
import dk.camelot64.kickc.model.types.SymbolTypeInference;
@ -12,7 +13,6 @@ import dk.camelot64.kickc.model.types.SymbolTypeStruct;
import dk.camelot64.kickc.model.values.*;
import dk.camelot64.kickc.passes.unwinding.ValueSource;
import dk.camelot64.kickc.passes.unwinding.ValueSourceFactory;
import dk.camelot64.kickc.passes.unwinding.ValueSourceVariable;
import java.util.ArrayList;
import java.util.List;
@ -322,15 +322,30 @@ public class Pass1UnwindStructValues extends Pass1Base {
if(program.getLog().isVerboseStructUnwind())
program.getLog().append("Unwinding value copy " + currentStmt.toString(program, false));
/*
if(lValueSource instanceof ValueSourceVariable) {
final ValueSourceVariable sourceVariable = (ValueSourceVariable) lValueSource;
Statement assignStmt = new StatementAssignment(new PointerDereferenceSimple(new ConstantSymbolPointer(sourceVariable.getVariable().getVariableRef())), new MemsetValue(sourceVariable.getByteSize(program.getScope()), sourceVariable.getSymbolType()), initialAssignment, currentStmt.getSource(), Comment.NO_COMMENTS);
stmtIt.add(assignStmt);
stmtIt.next();
//Special handling of unions
if(lValueSource.getSymbolType() instanceof SymbolTypeStruct) {
SymbolTypeStruct structType = (SymbolTypeStruct) lValueSource.getSymbolType();
if(structType.isUnion()) {
// Find the largest member to unwind to
final StructDefinition unionDefinition = structType.getStructDefinition(program.getScope());
int unionBytes = structType.getSizeBytes();
for(String memberName : lValueSource.getMemberNames(program.getScope())) {
final Variable unionMember = unionDefinition.getMember(memberName);
final int memberBytes = unionMember.getType().getSizeBytes();
if(memberBytes==unionBytes) {
// Found a union member with the total number of bytes - unwind to this member
ValueSource lValueSubSource = lValueSource.getMemberUnwinding(memberName, program, program.getScope(), currentStmt, stmtIt, currentBlock);
ValueSource rValueSubSource = rValueSource.getMemberUnwinding(memberName, program, program.getScope(), currentStmt, stmtIt, currentBlock);
boolean success = copyValues(lValueSubSource, rValueSubSource, lValueUnwoundList, initialAssignment, currentStmt, currentBlock, stmtIt, program);
if(!success)
throw new InternalError("Error during value unwinding copy! ", currentStmt);
return true;
}
}
}
}
*/
// Normal unwinding of non-unions
for(String memberName : lValueSource.getMemberNames(program.getScope())) {
ValueSource lValueSubSource = lValueSource.getMemberUnwinding(memberName, program, program.getScope(), currentStmt, stmtIt, currentBlock);
ValueSource rValueSubSource = rValueSource.getMemberUnwinding(memberName, program, program.getScope(), currentStmt, stmtIt, currentBlock);

11
src/main/java/dk/camelot64/kickc/passes/unwinding/ValueSourceFactory.java
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@ -33,9 +33,14 @@ public class ValueSourceFactory {
if(valueType instanceof SymbolTypeStruct && value instanceof CastValue && ((CastValue) value).getValue() instanceof ValueList) {
ValueList valueList = (ValueList) ((CastValue) value).getValue();
final StructDefinition structDefinition = ((SymbolTypeStruct) valueType).getStructDefinition(programScope);
int numMembers = structDefinition.getAllVars(false).size();
if(numMembers != valueList.getList().size()) {
throw new CompileError("Struct initialization list has wrong size. Need " + numMembers + " got " + valueList.getList().size(), currentStmt);
int expectSize;
if(structDefinition.isUnion()) {
expectSize = 1;
} else {
expectSize = structDefinition.getAllVars(false).size();
}
if(expectSize != valueList.getList().size()) {
throw new CompileError("Struct/Union initialization list has wrong size. Need " + expectSize + " got " + valueList.getList().size(), currentStmt);
}
return new ValueSourceStructValueList(valueList, structDefinition);
}

5
src/test/java/dk/camelot64/kickc/test/TestProgramsFast.java
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@ -2238,6 +2238,11 @@ public class TestProgramsFast extends TestPrograms {
}
@Test
public void testUnion8() throws IOException {
compileAndCompare("union-8.c");
}
@Test
public void testUnion7() throws IOException {
compileAndCompare("union-7.c");

20
src/test/kc/union-8.c Normal file
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@ -0,0 +1,20 @@
// Minimal union with C-Standard behavior - union return value
union Data {
unsigned int w;
unsigned char b;
};
char* const SCREEN = (char*)0x0400;
char idx = 0;
void main() {
union Data d1 = data(0x1234);
SCREEN[idx++] = d1.b;
union Data d2 = data(0x5678);
SCREEN[idx++] = d2.b;
}
union Data data(unsigned int i) {
return { i };
}

62
src/test/ref/union-8.asm Normal file
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@ -0,0 +1,62 @@
// Minimal union with C-Standard behavior - union return value
// Commodore 64 PRG executable file
.file [name="union-8.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)
.const SIZEOF_UNION_DATA = 2
.label SCREEN = $400
.segment Code
main: {
.label d1 = 4
.label d2 = 6
// union Data d1 = data(0x1234)
lda #<$1234
sta.z data.i
lda #>$1234
sta.z data.i+1
jsr data
// union Data d1 = data(0x1234)
ldy #SIZEOF_UNION_DATA
!:
lda data.return-1,y
sta d1-1,y
dey
bne !-
// SCREEN[idx++] = d1.b
lda.z d1
sta SCREEN
// union Data d2 = data(0x5678)
lda #<$5678
sta.z data.i
lda #>$5678
sta.z data.i+1
jsr data
// union Data d2 = data(0x5678)
ldy #SIZEOF_UNION_DATA
!:
lda data.return-1,y
sta d2-1,y
dey
bne !-
// SCREEN[idx++] = d2.b
lda.z d2
sta SCREEN+1
// }
rts
}
// data(word zp(2) i)
data: {
.label return = 8
.label i = 2
// return { i };
lda.z i
sta.z return
lda.z i+1
sta.z return+1
// }
rts
}

27
src/test/ref/union-8.cfg Normal file
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@ -0,0 +1,27 @@
void main()
main: scope:[main] from
[0] phi()
[1] call data
to:main::@1
main::@1: scope:[main] from main
[2] *(&main::d1) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA)
[3] *SCREEN = *((byte*)&main::d1)
[4] call data
to:main::@2
main::@2: scope:[main] from main::@1
[5] *(&main::d2) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA)
[6] *(SCREEN+1) = *((byte*)&main::d2)
to:main::@return
main::@return: scope:[main] from main::@2
[7] return
to:@return
union Data data(word data::i)
data: scope:[data] from main main::@1
[8] data::i#2 = phi( main/$1234, main::@1/$5678 )
[9] *((word*)&data::return) = data::i#2
to:data::@return
data::@return: scope:[data] from data
[10] return
to:@return

450
src/test/ref/union-8.log Normal file
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@ -0,0 +1,450 @@
Constantified RValue data::return = (union Data){ data::i }
Inlined call call __init
Eliminating unused variable with no statement main::$0
Eliminating unused variable with no statement main::$1
Removing C-classic struct-unwound assignment data::return = struct-unwound {*((word*)&data::return+OFFSET_UNION_DATA_W)}
CONTROL FLOW GRAPH SSA
void main()
main: scope:[main] from __start::@1
idx#11 = phi( __start::@1/idx#12 )
data::i#0 = $1234
call data
data::return = data::return
to:main::@1
main::@1: scope:[main] from main
idx#6 = phi( main/idx#11 )
main::d1 = data::return
SCREEN[idx#6] = *((byte*)&main::d1+OFFSET_UNION_DATA_B)
idx#0 = ++ idx#6
data::i#1 = $5678
call data
data::return = data::return
to:main::@2
main::@2: scope:[main] from main::@1
idx#7 = phi( main::@1/idx#0 )
main::d2 = data::return
SCREEN[idx#7] = *((byte*)&main::d2+OFFSET_UNION_DATA_B)
idx#1 = ++ idx#7
to:main::@return
main::@return: scope:[main] from main::@2
idx#8 = phi( main::@2/idx#1 )
idx#2 = idx#8
return
to:@return
union Data data(word data::i)
data: scope:[data] from main main::@1
data::i#2 = phi( main/data::i#0, main::@1/data::i#1 )
*((word*)&data::return+OFFSET_UNION_DATA_W) = data::i#2
to:data::@return
data::@return: scope:[data] from data
return
to:@return
void __start()
__start: scope:[__start] from
to:__start::__init1
__start::__init1: scope:[__start] from __start
idx#3 = 0
to:__start::@1
__start::@1: scope:[__start] from __start::__init1
idx#12 = phi( __start::__init1/idx#3 )
call main
to:__start::@2
__start::@2: scope:[__start] from __start::@1
idx#9 = phi( __start::@1/idx#2 )
idx#4 = idx#9
to:__start::@return
__start::@return: scope:[__start] from __start::@2
idx#10 = phi( __start::@2/idx#4 )
idx#5 = idx#10
return
to:@return
SYMBOL TABLE SSA
constant byte OFFSET_UNION_DATA_B = 0
constant byte OFFSET_UNION_DATA_W = 0
constant byte* const SCREEN = (byte*)$400
void __start()
union Data data(word data::i)
word data::i
word data::i#0
word data::i#1
word data::i#2
union Data data::return loadstore
byte idx
byte idx#0
byte idx#1
byte idx#10
byte idx#11
byte idx#12
byte idx#2
byte idx#3
byte idx#4
byte idx#5
byte idx#6
byte idx#7
byte idx#8
byte idx#9
void main()
union Data main::d1 loadstore
union Data main::d2 loadstore
Adding number conversion cast (unumber) $1234 in data::i#0 = $1234
Adding number conversion cast (unumber) $5678 in data::i#1 = $5678
Successful SSA optimization PassNAddNumberTypeConversions
Inlining cast data::i#0 = (unumber)$1234
Inlining cast data::i#1 = (unumber)$5678
Successful SSA optimization Pass2InlineCast
Simplifying constant pointer cast (byte*) 1024
Simplifying constant integer cast $1234
Simplifying constant integer cast $5678
Successful SSA optimization PassNCastSimplification
Finalized unsigned number type (word) $1234
Finalized unsigned number type (word) $5678
Successful SSA optimization PassNFinalizeNumberTypeConversions
Alias idx#11 = idx#6
Alias idx#0 = idx#7
Alias idx#1 = idx#8 idx#2
Alias idx#12 = idx#3
Alias idx#10 = idx#4 idx#9 idx#5
Successful SSA optimization Pass2AliasElimination
Identical Phi Values idx#11 idx#12
Identical Phi Values idx#10 idx#1
Successful SSA optimization Pass2IdenticalPhiElimination
Constant data::i#0 = $1234
Constant data::i#1 = $5678
Constant idx#12 = 0
Successful SSA optimization Pass2ConstantIdentification
Simplifying expression containing zero (byte*)&main::d1 in [5] SCREEN[idx#12] = *((byte*)&main::d1+OFFSET_UNION_DATA_B)
Simplifying expression containing zero SCREEN in [5] SCREEN[idx#12] = *((byte*)&main::d1)
Simplifying expression containing zero (byte*)&main::d2 in [11] SCREEN[idx#0] = *((byte*)&main::d2+OFFSET_UNION_DATA_B)
Simplifying expression containing zero (word*)&data::return in [15] *((word*)&data::return+OFFSET_UNION_DATA_W) = data::i#2
Successful SSA optimization PassNSimplifyExpressionWithZero
Eliminating unused variable idx#1 and assignment [9] idx#1 = ++ idx#0
Eliminating unused constant OFFSET_UNION_DATA_W
Eliminating unused constant OFFSET_UNION_DATA_B
Successful SSA optimization PassNEliminateUnusedVars
Removing unused procedure __start
Removing unused procedure block __start
Removing unused procedure block __start::__init1
Removing unused procedure block __start::@1
Removing unused procedure block __start::@2
Removing unused procedure block __start::@return
Successful SSA optimization PassNEliminateEmptyStart
Constant right-side identified [4] idx#0 = ++ idx#12
Successful SSA optimization Pass2ConstantRValueConsolidation
Constant idx#0 = ++idx#12
Successful SSA optimization Pass2ConstantIdentification
Inlining constant with var siblings data::i#0
Inlining constant with var siblings data::i#1
Inlining constant with different constant siblings idx#12
Inlining constant with different constant siblings idx#0
Constant inlined idx#12 = 0
Constant inlined idx#0 = ++0
Constant inlined data::i#1 = $5678
Constant inlined data::i#0 = $1234
Successful SSA optimization Pass2ConstantInlining
Consolidated array index constant in *(SCREEN+++0)
Successful SSA optimization Pass2ConstantAdditionElimination
Simplifying constant integer increment ++0
Successful SSA optimization Pass2ConstantSimplification
Removing C-classic struct-unwound assignment data::return = struct-unwound {}
Removing C-classic struct-unwound assignment main::d1 = struct-unwound {*(&main::d1)}
Removing C-classic struct-unwound assignment data::return = struct-unwound {}
Removing C-classic struct-unwound assignment main::d2 = struct-unwound {*(&main::d2)}
Adding NOP phi() at start of main
CALL GRAPH
Calls in [main] to data:1 data:4
Created 1 initial phi equivalence classes
Coalesced down to 1 phi equivalence classes
Adding NOP phi() at start of main
FINAL CONTROL FLOW GRAPH
void main()
main: scope:[main] from
[0] phi()
[1] call data
to:main::@1
main::@1: scope:[main] from main
[2] *(&main::d1) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA)
[3] *SCREEN = *((byte*)&main::d1)
[4] call data
to:main::@2
main::@2: scope:[main] from main::@1
[5] *(&main::d2) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA)
[6] *(SCREEN+1) = *((byte*)&main::d2)
to:main::@return
main::@return: scope:[main] from main::@2
[7] return
to:@return
union Data data(word data::i)
data: scope:[data] from main main::@1
[8] data::i#2 = phi( main/$1234, main::@1/$5678 )
[9] *((word*)&data::return) = data::i#2
to:data::@return
data::@return: scope:[data] from data
[10] return
to:@return
VARIABLE REGISTER WEIGHTS
union Data data(word data::i)
word data::i
word data::i#2 11.0
union Data data::return loadstore
byte idx
void main()
union Data main::d1 loadstore
union Data main::d2 loadstore
Initial phi equivalence classes
[ data::i#2 ]
Added variable main::d1 to live range equivalence class [ main::d1 ]
Added variable main::d2 to live range equivalence class [ main::d2 ]
Added variable data::return to live range equivalence class [ data::return ]
Complete equivalence classes
[ data::i#2 ]
[ main::d1 ]
[ main::d2 ]
[ data::return ]
Allocated zp[2]:2 [ data::i#2 ]
Allocated zp[2]:4 [ main::d1 ]
Allocated zp[2]:6 [ main::d2 ]
Allocated zp[2]:8 [ data::return ]
REGISTER UPLIFT POTENTIAL REGISTERS
Statement [2] *(&main::d1) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA) [ main::d1 data::return main::d2 ] ( [ main::d1 data::return main::d2 ] { } ) always clobbers reg byte a reg byte y
Statement [3] *SCREEN = *((byte*)&main::d1) [ data::return main::d2 ] ( [ data::return main::d2 ] { } ) always clobbers reg byte a
Statement [5] *(&main::d2) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA) [ main::d2 ] ( [ main::d2 ] { } ) always clobbers reg byte a reg byte y
Statement [6] *(SCREEN+1) = *((byte*)&main::d2) [ ] ( [ ] { } ) always clobbers reg byte a
Statement [9] *((word*)&data::return) = data::i#2 [ data::return ] ( data:1 [ main::d1 main::d2 data::return ] { } data:4 [ main::d2 data::return ] { } ) always clobbers reg byte a
Potential registers zp[2]:2 [ data::i#2 ] : zp[2]:2 ,
Potential registers zp[2]:4 [ main::d1 ] : zp[2]:4 ,
Potential registers zp[2]:6 [ main::d2 ] : zp[2]:6 ,
Potential registers zp[2]:8 [ data::return ] : zp[2]:8 ,
REGISTER UPLIFT SCOPES
Uplift Scope [data] 11: zp[2]:2 [ data::i#2 ] 0: zp[2]:8 [ data::return ]
Uplift Scope [Data]
Uplift Scope [main] 0: zp[2]:4 [ main::d1 ] 0: zp[2]:6 [ main::d2 ]
Uplift Scope []
Uplifting [data] best 114 combination zp[2]:2 [ data::i#2 ] zp[2]:8 [ data::return ]
Uplifting [Data] best 114 combination
Uplifting [main] best 114 combination zp[2]:4 [ main::d1 ] zp[2]:6 [ main::d2 ]
Uplifting [] best 114 combination
ASSEMBLER BEFORE OPTIMIZATION
// File Comments
// Minimal union with C-Standard behavior - union return value
// Upstart
// Commodore 64 PRG executable file
.file [name="union-8.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
.const SIZEOF_UNION_DATA = 2
.label SCREEN = $400
.segment Code
// main
main: {
.label d1 = 4
.label d2 = 6
// [1] call data
// [8] phi from main to data [phi:main->data]
data_from_main:
// [8] phi data::i#2 = $1234 [phi:main->data#0] -- vwuz1=vwuc1
lda #<$1234
sta.z data.i
lda #>$1234
sta.z data.i+1
jsr data
jmp __b1
// main::@1
__b1:
// [2] *(&main::d1) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3
ldy #SIZEOF_UNION_DATA
!:
lda data.return-1,y
sta d1-1,y
dey
bne !-
// [3] *SCREEN = *((byte*)&main::d1) -- _deref_pbuc1=_deref_pbuc2
lda.z d1
sta SCREEN
// [4] call data
// [8] phi from main::@1 to data [phi:main::@1->data]
data_from___b1:
// [8] phi data::i#2 = $5678 [phi:main::@1->data#0] -- vwuz1=vwuc1
lda #<$5678
sta.z data.i
lda #>$5678
sta.z data.i+1
jsr data
jmp __b2
// main::@2
__b2:
// [5] *(&main::d2) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3
ldy #SIZEOF_UNION_DATA
!:
lda data.return-1,y
sta d2-1,y
dey
bne !-
// [6] *(SCREEN+1) = *((byte*)&main::d2) -- _deref_pbuc1=_deref_pbuc2
lda.z d2
sta SCREEN+1
jmp __breturn
// main::@return
__breturn:
// [7] return
rts
}
// data
// data(word zp(2) i)
data: {
.label return = 8
.label i = 2
// [9] *((word*)&data::return) = data::i#2 -- _deref_pwuc1=vwuz1
lda.z i
sta.z return
lda.z i+1
sta.z return+1
jmp __breturn
// data::@return
__breturn:
// [10] return
rts
}
// File Data
ASSEMBLER OPTIMIZATIONS
Removing instruction jmp __b1
Removing instruction jmp __b2
Removing instruction jmp __breturn
Removing instruction jmp __breturn
Succesful ASM optimization Pass5NextJumpElimination
Removing instruction data_from_main:
Removing instruction __b1:
Removing instruction data_from___b1:
Removing instruction __b2:
Removing instruction __breturn:
Removing instruction __breturn:
Succesful ASM optimization Pass5UnusedLabelElimination
FINAL SYMBOL TABLE
constant byte* const SCREEN = (byte*) 1024
constant byte SIZEOF_UNION_DATA = 2
union Data data(word data::i)
word data::i
word data::i#2 i zp[2]:2 11.0
union Data data::return loadstore zp[2]:8
byte idx
void main()
union Data main::d1 loadstore zp[2]:4
union Data main::d2 loadstore zp[2]:6
zp[2]:2 [ data::i#2 ]
zp[2]:4 [ main::d1 ]
zp[2]:6 [ main::d2 ]
zp[2]:8 [ data::return ]
FINAL ASSEMBLER
Score: 102
// File Comments
// Minimal union with C-Standard behavior - union return value
// Upstart
// Commodore 64 PRG executable file
.file [name="union-8.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
.const SIZEOF_UNION_DATA = 2
.label SCREEN = $400
.segment Code
// main
main: {
.label d1 = 4
.label d2 = 6
// union Data d1 = data(0x1234)
// [1] call data
// [8] phi from main to data [phi:main->data]
// [8] phi data::i#2 = $1234 [phi:main->data#0] -- vwuz1=vwuc1
lda #<$1234
sta.z data.i
lda #>$1234
sta.z data.i+1
jsr data
// main::@1
// union Data d1 = data(0x1234)
// [2] *(&main::d1) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3
ldy #SIZEOF_UNION_DATA
!:
lda data.return-1,y
sta d1-1,y
dey
bne !-
// SCREEN[idx++] = d1.b
// [3] *SCREEN = *((byte*)&main::d1) -- _deref_pbuc1=_deref_pbuc2
lda.z d1
sta SCREEN
// union Data d2 = data(0x5678)
// [4] call data
// [8] phi from main::@1 to data [phi:main::@1->data]
// [8] phi data::i#2 = $5678 [phi:main::@1->data#0] -- vwuz1=vwuc1
lda #<$5678
sta.z data.i
lda #>$5678
sta.z data.i+1
jsr data
// main::@2
// union Data d2 = data(0x5678)
// [5] *(&main::d2) = memcpy(*(&data::return), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3
ldy #SIZEOF_UNION_DATA
!:
lda data.return-1,y
sta d2-1,y
dey
bne !-
// SCREEN[idx++] = d2.b
// [6] *(SCREEN+1) = *((byte*)&main::d2) -- _deref_pbuc1=_deref_pbuc2
lda.z d2
sta SCREEN+1
// main::@return
// }
// [7] return
rts
}
// data
// data(word zp(2) i)
data: {
.label return = 8
.label i = 2
// return { i };
// [9] *((word*)&data::return) = data::i#2 -- _deref_pwuc1=vwuz1
lda.z i
sta.z return
lda.z i+1
sta.z return+1
// data::@return
// }
// [10] return
rts
}
// File Data

15
src/test/ref/union-8.sym Normal file
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@ -0,0 +1,15 @@
constant byte* const SCREEN = (byte*) 1024
constant byte SIZEOF_UNION_DATA = 2
union Data data(word data::i)
word data::i
word data::i#2 i zp[2]:2 11.0
union Data data::return loadstore zp[2]:8
byte idx
void main()
union Data main::d1 loadstore zp[2]:4
union Data main::d2 loadstore zp[2]:6
zp[2]:2 [ data::i#2 ]
zp[2]:4 [ main::d1 ]
zp[2]:6 [ main::d2 ]
zp[2]:8 [ data::return ]