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optimize word repeat loop codegen

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This commit is contained in:
Irmen de Jong 2023-07-02 03:57:42 +02:00
parent d3f6415387
commit aac5a4c27f
3 changed files with 131 additions and 56 deletions
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77
codeGenCpu6502/src/prog8/codegen/cpu6502/AsmGen.kt
View File

@ -641,65 +641,48 @@ class AsmGen6502Internal (
private fun repeatWordCount(count: Int, stmt: PtRepeatLoop) {
require(count in 257..65535) { "invalid repeat count ${stmt.position}" }
val repeatLabel = makeLabel("repeat")
if(isTargetCpu(CpuType.CPU65c02)) {
val counterVar = createRepeatCounterVar(DataType.UWORD, true, stmt)
out("""
lda #<$count
ldy #>$count
sta $counterVar
sty $counterVar+1
val counterVar = createRepeatCounterVar(DataType.UWORD, isTargetCpu(CpuType.CPU65c02), stmt)
// the iny + double dec is microoptimization of the 16 bit loop
out("""
ldy #>$count
lda #<$count
beq +
iny
+ sta $counterVar
sty $counterVar+1
$repeatLabel""")
translate(stmt.statements)
out("""
lda $counterVar
bne +
dec $counterVar+1
+ dec $counterVar
lda $counterVar
ora $counterVar+1
bne $repeatLabel""")
} else {
val counterVar = createRepeatCounterVar(DataType.UWORD, false, stmt)
out("""
lda #<$count
ldy #>$count
sta $counterVar
sty $counterVar+1
$repeatLabel""")
translate(stmt.statements)
out("""
lda $counterVar
bne +
dec $counterVar+1
+ dec $counterVar
lda $counterVar
ora $counterVar+1
bne $repeatLabel""")
}
translate(stmt.statements)
out("""
dec $counterVar
bne $repeatLabel
dec $counterVar+1
bne $repeatLabel""")
}
private fun repeatWordCountInAY(endLabel: String, stmt: PtRepeatLoop) {
// note: A/Y must have been loaded with the number of iterations!
// no need to explicitly test for 0 iterations as this is done in the countdown logic below
// the iny + double dec is microoptimization of the 16 bit loop
val repeatLabel = makeLabel("repeat")
val counterVar = createRepeatCounterVar(DataType.UWORD, false, stmt)
out("""
sta $counterVar
sty $counterVar+1
$repeatLabel lda $counterVar
bne +
lda $counterVar+1
beq $endLabel
lda $counterVar
bne +
dec $counterVar+1
+ dec $counterVar
""")
cmp #0
beq +
iny
+ sta $counterVar
sty $counterVar+1
ora $counterVar+1
beq $endLabel
$repeatLabel""")
translate(stmt.statements)
jmp(repeatLabel)
out("""
dec $counterVar
bne $repeatLabel
dec $counterVar+1
bne $repeatLabel""")
out(endLabel)
}
private fun repeatByteCount(count: Int, stmt: PtRepeatLoop) {
require(count in 2..256) { "invalid repeat count ${stmt.position}" }
val repeatLabel = makeLabel("repeat")

69
compiler/test/vm/TestCompilerVirtual.kt
View File

@ -364,7 +364,7 @@ main {
compileText(VMTarget(), false, text, writeAssembly = true) shouldNotBe null
}
test("repeat counts") {
test("repeat counts (const)") {
val src="""
main {
sub start() {
@ -387,14 +387,77 @@ main {
repeat 1025 {
cx16.r0++
}
repeat 65534 {
cx16.r0++
}
repeat 65535 {
cx16.r0++
}
repeat 0 {
cx16.r0++
}
}
}"""
val result = compileText(VMTarget(), false, src, writeAssembly = true)!!
val start = result.codegenAst!!.entrypoint()!!
start.children.size shouldBe 8
start.children.size shouldBe 11
val virtfile = result.compilationOptions.outputDir.resolve(result.compilerAst.name + ".p8ir")
VmRunner().runAndTestProgram(virtfile.readText()) { vm ->
vm.memory.getUW(vm.cx16virtualregsBaseAddress) shouldBe 3840u
vm.memory.getUW(vm.cx16virtualregsBaseAddress) shouldBe 3837u
}
}
test("repeat counts (variable)") {
val src="""
main {
sub start() {
uword count
cx16.r0 = 0
count=255
repeat count {
cx16.r0++
}
count=256
repeat count {
cx16.r0++
}
count=257
repeat count {
cx16.r0++
}
count=1023
repeat count {
cx16.r0++
}
count=1024
repeat count {
cx16.r0++
}
count=1025
repeat count {
cx16.r0++
}
count=65534
repeat count {
cx16.r0++
}
count=65535
repeat count {
cx16.r0++
}
count=0
repeat count {
cx16.r0++
}
}
}"""
val result = compileText(VMTarget(), false, src, writeAssembly = true)!!
val start = result.codegenAst!!.entrypoint()!!
start.children.size shouldBe 22
val virtfile = result.compilationOptions.outputDir.resolve(result.compilerAst.name + ".p8ir")
VmRunner().runAndTestProgram(virtfile.readText()) { vm ->
vm.memory.getUW(vm.cx16virtualregsBaseAddress) shouldBe 3837u
}
}
})

41
examples/test.p8
View File

@ -3,8 +3,9 @@
main {
sub start() {
uword count = 255
cx16.r0 = 0
repeat 255 {
repeat count {
cx16.r0++
}
txt.print_uw(255)
@ -12,40 +13,68 @@ main {
txt.print_uw(cx16.r0)
txt.nl()
repeat 256 {
count=256
repeat count {
cx16.r0++
}
txt.print_uw(255+256)
txt.spc()
txt.print_uw(cx16.r0)
txt.nl()
repeat 257 {
count = 257
repeat count {
cx16.r0++
}
txt.print_uw(255+256+257)
txt.spc()
txt.print_uw(cx16.r0)
txt.nl()
repeat 1023 {
count=1023
repeat count {
cx16.r0++
}
txt.print_uw(255+256+257+1023)
txt.spc()
txt.print_uw(cx16.r0)
txt.nl()
repeat 1024 {
count=1024
repeat count {
cx16.r0++
}
txt.print_uw(255+256+257+1023+1024)
txt.spc()
txt.print_uw(cx16.r0)
txt.nl()
repeat 1025 {
count = 1025
repeat count {
cx16.r0++
}
txt.print_uw(255+256+257+1023+1024+1025)
txt.spc()
txt.print_uw(cx16.r0)
txt.nl()
count = 65534
repeat count {
cx16.r0++
}
txt.print_uw(3838)
txt.spc()
txt.print_uw(cx16.r0)
txt.nl()
count = 65535
repeat count {
cx16.r0++
}
count=0
repeat count {
cx16.r0++
}
repeat 0 {
cx16.r0++
}
txt.print_uw(3837)
txt.spc()
txt.print_uw(cx16.r0)
txt.nl()
}
}