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added cx16 verafx library module
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Irmen de Jong
parent
55646edc3e
commit
390263a34e
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@ -267,6 +267,17 @@ cx16 {
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&ubyte VERA_AUDIO_DATA = VERA_BASE + $001D
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&ubyte VERA_SPI_DATA = VERA_BASE + $001E
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&ubyte VERA_SPI_CTRL = VERA_BASE + $001F
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; experimental Vera FX registers: (depends on particular value set in VERA_CTRL!!!)
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&ubyte VERA_FX_CTRL = VERA_BASE + $0009
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&ubyte VERA_FX_MULT = VERA_BASE + $000C
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&ubyte VERA_FX_CACHE_L = VERA_BASE + $0009
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&ubyte VERA_FX_CACHE_M = VERA_BASE + $000A
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&ubyte VERA_FX_CACHE_H = VERA_BASE + $000B
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&ubyte VERA_FX_CACHE_U = VERA_BASE + $000C
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&ubyte VERA_FX_ACCUM_RESET = VERA_BASE + $0009 ; (DCSEL=6)
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; VERA_PSG_BASE = $1F9C0
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; VERA_PALETTE_BASE = $1FA00
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; VERA_SPRITES_BASE = $1FC00
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59
compiler/res/prog8lib/cx16/verafx.p8
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59
compiler/res/prog8lib/cx16/verafx.p8
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@ -0,0 +1,59 @@
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; Experimental Vera FX support.
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; Docs:
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; https://github.com/X16Community/x16-docs/blob/master/VERA%20FX%20Reference.md
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; https://docs.google.com/document/d/1q34uWOiM3Be2pnaHRVgSdHySI-qsiQWPTo_gfE54PTg/edit
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verafx {
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; unsigned multiplication just passes the values as signed to muls
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; if you do this yourself in your call to muls, it will save a few instructions.
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sub mult(uword value1, uword value2) -> uword {
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return muls(value1 as word, value2 as word) as uword
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}
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asmsub muls(word value1 @R0, word value2 @R1) -> word @AY {
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%asm {{
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lda #(2 << 1)
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sta cx16.VERA_CTRL ; $9F25
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stz cx16.VERA_FX_CTRL ; $9F29 (mainly to reset Addr1 Mode to 0)
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lda #%00010000
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sta cx16.VERA_FX_MULT ; $9F2C
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lda #(6 << 1)
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sta cx16.VERA_CTRL ; $9F25
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lda cx16.r0
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ldy cx16.r0+1
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sta cx16.VERA_FX_CACHE_L ; $9F29
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sty cx16.VERA_FX_CACHE_M ; $9F2A
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lda cx16.r1
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ldy cx16.r1+1
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sta cx16.VERA_FX_CACHE_H ; $9F2B
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sty cx16.VERA_FX_CACHE_U ; $9F2C
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lda cx16.VERA_FX_ACCUM_RESET ; $9F29 (DCSEL=6)
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; Set the ADDR0 pointer to $1f9bc and write our multiplication result there
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; (these are the 4 bytes just before the PSG registers start)
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lda #(2 << 1)
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sta cx16.VERA_CTRL
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lda #%01000000 ; Cache Write Enable
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sta cx16.VERA_FX_CTRL
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lda #$bc
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sta cx16.VERA_ADDR_L
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lda #$f9
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sta cx16.VERA_ADDR_M
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lda #$01
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sta cx16.VERA_ADDR_H ; no increment
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stz cx16.VERA_DATA0 ; multiply and write out result
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lda #%00010001 ; $01 with Increment 1
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sta cx16.VERA_ADDR_H ; so we can read out the result
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stz cx16.VERA_FX_CTRL ; Cache write disable
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lda cx16.VERA_DATA0
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ldy cx16.VERA_DATA0
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rts
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; we skip the upper 16 bits of the result:
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; lda cx16.VERA_DATA0
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; sta $0402
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; lda cx16.VERA_DATA0
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; sta $0403
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}}
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}
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}
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@ -64,6 +64,7 @@ multiply_words .proc
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; but there currently is no way to use 4 consecutive bytes in ZP (without disabling irq and saving/restoring them)...
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; mult62.a
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; from: https://github.com/TobyLobster/multiply_test/blob/main/tests/mult62.a
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; based on Dr Jefyll, http://forum.6502.org/viewtopic.php?f=9&t=689&start=0#p19958
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; - adjusted to use fixed zero page addresses
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; - removed 'decrement to avoid clc' as this is slower on average
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@ -485,3 +485,17 @@ See the examples/cx16/sprites/dragon.p8 and dragons.p8 programs for ideas how to
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Read the `source code <https://github.com/irmen/prog8/tree/master/compiler/res/prog8lib/cx16/sprites.p8>`_
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to see what's in there.
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verafx (cx16 only)
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-------------------
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Available for the Cx16 target.
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Experimental routines that use the new Vera FX logic (hopefully coming in the Vera in new X16 boards,
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the emulators already support it).
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For now, the hardware 16*16 multiplier is exposed via ``mult`` and ``muls`` routines.
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They are about 4 to 5 times faster as the default 6502 cpu routine for word multiplication.
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But they depend on
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Read the `source code <https://github.com/irmen/prog8/tree/master/compiler/res/prog8lib/cx16/verafx.p8>`_
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to see what's in there.
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@ -1,26 +1,39 @@
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%import textio
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%import floats
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%import verafx
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%zeropage basicsafe
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%option no_sysinit
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main {
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sub start() {
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ubyte from = 10
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ubyte compare=9
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if from==compare
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goto equal
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txt.print("from is not compare\n")
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equal:
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const word MULTIPLIER = 431
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ubyte end = 15
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ubyte xx
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for xx in from to end {
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txt.print_ub(xx)
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txt.spc()
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; verify results:
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for value in -50 to 50 {
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if value*MULTIPLIER != verafx.muls(value, MULTIPLIER) {
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txt.print("verafx muls error\n")
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sys.exit(1)
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}
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}
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word value
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txt.print("verafx muls...")
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cbm.SETTIM(0,0,0)
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for value in -50 to 50 {
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repeat 250 void verafx.muls(value, MULTIPLIER)
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}
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txt.print_uw(cbm.RDTIM16())
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txt.nl()
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txt.print("6502 muls...")
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cbm.SETTIM(0,0,0)
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for value in -50 to 50 {
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repeat 250 cx16.r0s = value*MULTIPLIER
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}
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txt.print_uw(cbm.RDTIM16())
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txt.nl()
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ubyte ten=9
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if from!=ten
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txt.print("from is not 10\n")
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}
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}
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