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got rid of useless opcode
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parent
c6c75c43ff
commit
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@ -43,7 +43,6 @@ class IntermediateProgram(val name: String, var loadAddress: Int, val heap: Heap
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optimizeVariableCopying()
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optimizeVariableCopying()
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optimizeMultipleSequentialLineInstrs()
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optimizeMultipleSequentialLineInstrs()
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optimizeCallReturnIntoJump()
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optimizeCallReturnIntoJump()
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optimizeRestoreXSaveXIntoRepopX()
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// todo: add more optimizations to stackvm code
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// todo: add more optimizations to stackvm code
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optimizeRemoveNops() // must be done as the last step
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optimizeRemoveNops() // must be done as the last step
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@ -57,24 +56,6 @@ class IntermediateProgram(val name: String, var loadAddress: Int, val heap: Heap
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blk.instructions.removeIf { it.opcode== Opcode.NOP && it !is LabelInstr }
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blk.instructions.removeIf { it.opcode== Opcode.NOP && it !is LabelInstr }
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}
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}
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private fun optimizeRestoreXSaveXIntoRepopX() {
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// replace rrestorex+rsavex combo by only repopX
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for(blk in blocks) {
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val instructionsToReplace = mutableMapOf<Int, Instruction>()
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blk.instructions.asSequence().withIndex().filter {it.value.opcode!=Opcode.LINE}.windowed(2).toList().forEach {
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if(it[0].value.opcode==Opcode.RRESTOREX && it[1].value.opcode==Opcode.RSAVEX) {
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instructionsToReplace[it[0].index] = Instruction(Opcode.REPOPX)
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instructionsToReplace[it[1].index] = Instruction(Opcode.NOP)
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}
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}
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for (rins in instructionsToReplace) {
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blk.instructions[rins.key] = rins.value
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}
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}
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}
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private fun optimizeCallReturnIntoJump() {
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private fun optimizeCallReturnIntoJump() {
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// replaces call X followed by return, by jump X
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// replaces call X followed by return, by jump X
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for(blk in blocks) {
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for(blk in blocks) {
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@ -261,7 +261,6 @@ enum class Opcode {
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RSAVEX, // save just X (the evaluation stack pointer)
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RSAVEX, // save just X (the evaluation stack pointer)
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RRESTORE, // restore all internal registers and status flags
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RRESTORE, // restore all internal registers and status flags
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RRESTOREX, // restore just X (the evaluation stack pointer)
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RRESTOREX, // restore just X (the evaluation stack pointer)
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REPOPX, // restore just X (the evaluation stack pointer) but store it again too (essentially not erasing the value that's saved on the stack)
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NOP, // do nothing
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NOP, // do nothing
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BREAKPOINT, // breakpoint
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BREAKPOINT, // breakpoint
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@ -422,7 +422,6 @@ class AsmGen(val options: CompilationOptions, val program: IntermediateProgram,
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}
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}
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Opcode.RSAVEX -> " sta ${C64Zeropage.SCRATCH_REG} | txa | pha | lda ${C64Zeropage.SCRATCH_REG}"
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Opcode.RSAVEX -> " sta ${C64Zeropage.SCRATCH_REG} | txa | pha | lda ${C64Zeropage.SCRATCH_REG}"
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Opcode.RRESTOREX -> " sta ${C64Zeropage.SCRATCH_REG} | pla | tax | lda ${C64Zeropage.SCRATCH_REG}"
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Opcode.RRESTOREX -> " sta ${C64Zeropage.SCRATCH_REG} | pla | tax | lda ${C64Zeropage.SCRATCH_REG}"
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Opcode.REPOPX -> " sta ${C64Zeropage.SCRATCH_REG} | pla | tax | pha | lda ${C64Zeropage.SCRATCH_REG}"
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Opcode.DISCARD_BYTE -> " inx"
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Opcode.DISCARD_BYTE -> " inx"
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Opcode.DISCARD_WORD -> " inx"
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Opcode.DISCARD_WORD -> " inx"
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Opcode.DISCARD_FLOAT -> " inx | inx | inx"
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Opcode.DISCARD_FLOAT -> " inx | inx | inx"
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@ -969,12 +968,14 @@ class AsmGen(val options: CompilationOptions, val program: IntermediateProgram,
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}
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}
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for(pattern in patterns.filter { it.sequence.size <= segment.size || (it.altSequence != null && it.altSequence.size <= segment.size)}) {
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for(pattern in patterns.filter { it.sequence.size <= segment.size || (it.altSequence != null && it.altSequence.size <= segment.size)}) {
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val opcodesList = opcodes.subList(0, pattern.sequence.size)
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val opcodesList = if(pattern.sequence.size<=opcodes.size) opcodes.subList(0, pattern.sequence.size) else null
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val opcodesListAlt = if(pattern.altSequence!=null && pattern.altSequence.size<=opcodes.size) opcodes.subList(0, pattern.altSequence.size) else null
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if(pattern.sequence == opcodesList) {
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if(pattern.sequence == opcodesList) {
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val asm = pattern.asm(segment)
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val asm = pattern.asm(segment)
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if(asm!=null)
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if(asm!=null)
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result.add(AsmFragment(asm, pattern.sequence.size))
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result.add(AsmFragment(asm, pattern.sequence.size))
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} else if(pattern.altSequence == opcodesList) {
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} else if(opcodesListAlt!=null && pattern.altSequence == opcodesListAlt) {
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val asm = pattern.asm(segment)
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val asm = pattern.asm(segment)
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if(asm!=null)
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if(asm!=null)
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result.add(AsmFragment(asm, pattern.sequence.size))
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result.add(AsmFragment(asm, pattern.sequence.size))
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@ -3202,6 +3203,15 @@ class AsmGen(val options: CompilationOptions, val program: IntermediateProgram,
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"""
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"""
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},
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},
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AsmPattern(listOf(Opcode.RRESTOREX, Opcode.LINE, Opcode.RSAVEX), listOf(Opcode.RRESTOREX, Opcode.RSAVEX)) { segment ->
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"""
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sta ${C64Zeropage.SCRATCH_REG}
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pla
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tax
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pha
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lda ${C64Zeropage.SCRATCH_REG}
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"""
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},
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// various optimizable integer multiplications
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// various optimizable integer multiplications
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AsmPattern(listOf(Opcode.PUSH_BYTE, Opcode.MUL_B), listOf(Opcode.PUSH_BYTE, Opcode.MUL_UB)) { segment ->
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AsmPattern(listOf(Opcode.PUSH_BYTE, Opcode.MUL_B), listOf(Opcode.PUSH_BYTE, Opcode.MUL_UB)) { segment ->
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@ -1487,7 +1487,6 @@ class StackVm(private var traceOutputFile: String?) {
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}
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}
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Opcode.RSAVEX -> evalstack.push(variables["X"])
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Opcode.RSAVEX -> evalstack.push(variables["X"])
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Opcode.RRESTOREX -> variables["X"] = evalstack.pop()
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Opcode.RRESTOREX -> variables["X"] = evalstack.pop()
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Opcode.REPOPX -> variables["X"] = evalstack.peek()
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Opcode.INLINE_ASSEMBLY -> throw VmExecutionException("stackVm doesn't support executing inline assembly code")
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Opcode.INLINE_ASSEMBLY -> throw VmExecutionException("stackVm doesn't support executing inline assembly code")
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Opcode.PUSH_ADDR_HEAPVAR -> {
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Opcode.PUSH_ADDR_HEAPVAR -> {
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val heapId = variables[ins.callLabel]!!.heapId
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val heapId = variables[ins.callLabel]!!.heapId
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