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optimized register save/restore on Cx16 cpu target

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This commit is contained in:
Irmen de Jong 2020-12-22 05:54:28 +01:00
parent 96c700ee46
commit 684e081399
3 changed files with 35 additions and 20 deletions
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5
compiler/res/prog8lib/diskio.p8
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@ -3,11 +3,8 @@
; Note: this code is compatible with C64 and CX16.
; TODO directory() BROKEN ON C64, SEEMS TO WORK ON CX16
diskio {
sub directory(ubyte drivenumber) -> ubyte {
; -- Prints the directory contents of disk drive 8-11 to the screen. Returns success.
@ -34,7 +31,7 @@ diskio {
ubyte @zp char
repeat {
char = c64.CHRIN()
if char==0 ; TODO doesn't work???
if char==0
break
txt.chrout(char)
}

25
compiler/src/prog8/compiler/target/c64/codegen/AsmGen.kt
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@ -548,10 +548,18 @@ internal class AsmGen(private val program: Program,
private fun fixNameSymbols(name: String) = name.replace("<", "prog8_").replace(">", "") // take care of the autogenerated invalid (anon) label names
internal fun saveRegisterLocal(register: CpuRegister, scope: Subroutine) {
if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02) {
// just use the cpu's stack for all registers, shorter code
when (register) {
CpuRegister.A -> out(" pha")
CpuRegister.X -> out(" phx")
CpuRegister.Y -> out(" phy")
}
} else {
when (register) {
CpuRegister.A -> {
out(" sta _prog8_regsaveA")
scope.asmGenInfo.usedRegsaveA = true
// just use the stack, only for A
out(" pha")
}
CpuRegister.X -> {
out(" stx _prog8_regsaveX")
@ -563,6 +571,7 @@ internal class AsmGen(private val program: Program,
}
}
}
}
internal fun saveRegisterStack(register: CpuRegister, keepA: Boolean) {
when (register) {
@ -589,12 +598,22 @@ internal class AsmGen(private val program: Program,
}
internal fun restoreRegisterLocal(register: CpuRegister) {
if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02) {
when (register) {
CpuRegister.A -> out(" lda _prog8_regsaveA")
// this just used the stack, for all registers. Shorter code.
CpuRegister.A -> out(" pla")
CpuRegister.X -> out(" plx")
CpuRegister.Y -> out(" ply")
}
} else {
when (register) {
CpuRegister.A -> out(" pla") // this just used the stack but only for A
CpuRegister.X -> out(" ldx _prog8_regsaveX")
CpuRegister.Y -> out(" ldy _prog8_regsaveY")
}
}
}
internal fun restoreRegisterStack(register: CpuRegister, keepA: Boolean) {
when (register) {

1
examples/cx16/imageviewer/imageviewer.p8
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@ -8,7 +8,6 @@
%import bmp_module
;; %import ci_module
; TODO WHY is this 400 bytes larger than a few hours ago?
main {
sub start() {