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added signed versions of the cx16 virtual registers

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Irmen de Jong 2021-11-13 02:42:21 +01:00
parent 3483515346
commit 2177ba0ed2
4 changed files with 107 additions and 4 deletions
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51
compiler/res/prog8lib/c64/syslib.p8
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@ -699,6 +699,23 @@ cx16 {
&uword r14 = $cf1c
&uword r15 = $cf1e
&word r0s = $cf00
&word r1s = $cf02
&word r2s = $cf04
&word r3s = $cf06
&word r4s = $cf08
&word r5s = $cf0a
&word r6s = $cf0c
&word r7s = $cf0e
&word r8s = $cf10
&word r9s = $cf12
&word r10s = $cf14
&word r11s = $cf16
&word r12s = $cf18
&word r13s = $cf1a
&word r14s = $cf1c
&word r15s = $cf1e
&ubyte r0L = $cf00
&ubyte r1L = $cf02
&ubyte r2L = $cf04
@ -732,4 +749,38 @@ cx16 {
&ubyte r13H = $cf1b
&ubyte r14H = $cf1d
&ubyte r15H = $cf1f
&byte r0sL = $cf00
&byte r1sL = $cf02
&byte r2sL = $cf04
&byte r3sL = $cf06
&byte r4sL = $cf08
&byte r5sL = $cf0a
&byte r6sL = $cf0c
&byte r7sL = $cf0e
&byte r8sL = $cf10
&byte r9sL = $cf12
&byte r10sL = $cf14
&byte r11sL = $cf16
&byte r12sL = $cf18
&byte r13sL = $cf1a
&byte r14sL = $cf1c
&byte r15sL = $cf1e
&byte r0sH = $cf01
&byte r1sH = $cf03
&byte r2sH = $cf05
&byte r3sH = $cf07
&byte r4sH = $cf09
&byte r5sH = $cf0b
&byte r6sH = $cf0d
&byte r7sH = $cf0f
&byte r8sH = $cf11
&byte r9sH = $cf13
&byte r10sH = $cf15
&byte r11sH = $cf17
&byte r12sH = $cf19
&byte r13sH = $cf1b
&byte r14sH = $cf1d
&byte r15sH = $cf1f
}

52
compiler/res/prog8lib/cx16/syslib.p8
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@ -95,7 +95,7 @@ cx16 {
&uword IRQ_VEC = $FFFE ; 65c02 interrupt vector, determined by the kernal if banked in
; the sixteen virtual 16-bit registers
; the sixteen virtual 16-bit registers in both normal unsigned mode and signed mode (s)
&uword r0 = $0002
&uword r1 = $0004
&uword r2 = $0006
@ -113,6 +113,23 @@ cx16 {
&uword r14 = $001e
&uword r15 = $0020
&word r0s = $0002
&word r1s = $0004
&word r2s = $0006
&word r3s = $0008
&word r4s = $000a
&word r5s = $000c
&word r6s = $000e
&word r7s = $0010
&word r8s = $0012
&word r9s = $0014
&word r10s = $0016
&word r11s = $0018
&word r12s = $001a
&word r13s = $001c
&word r14s = $001e
&word r15s = $0020
&ubyte r0L = $0002
&ubyte r1L = $0004
&ubyte r2L = $0006
@ -147,6 +164,39 @@ cx16 {
&ubyte r14H = $001f
&ubyte r15H = $0021
&byte r0sL = $0002
&byte r1sL = $0004
&byte r2sL = $0006
&byte r3sL = $0008
&byte r4sL = $000a
&byte r5sL = $000c
&byte r6sL = $000e
&byte r7sL = $0010
&byte r8sL = $0012
&byte r9sL = $0014
&byte r10sL = $0016
&byte r11sL = $0018
&byte r12sL = $001a
&byte r13sL = $001c
&byte r14sL = $001e
&byte r15sL = $0020
&byte r0sH = $0003
&byte r1sH = $0005
&byte r2sH = $0007
&byte r3sH = $0009
&byte r4sH = $000b
&byte r5sH = $000d
&byte r6sH = $000f
&byte r7sH = $0011
&byte r8sH = $0013
&byte r9sH = $0015
&byte r10sH = $0017
&byte r11sH = $0019
&byte r12sH = $001b
&byte r13sH = $001d
&byte r14sH = $001f
&byte r15sH = $0021
; VERA registers

6
docs/source/syntaxreference.rst
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@ -609,12 +609,14 @@ flag such as Carry (Pc).
.. note::
The 'virtual' 16-bit registers from the Commander X16 can also be used as ``R0`` .. ``R15`` .
The 'virtual' 16-bit registers from the Commander X16 can also be specified as ``R0`` .. ``R15`` .
This means you don't have to set them up manually before calling a subroutine that takes
one or more parameters in those 'registers'. You can just list the arguments directly.
*This also works on the Commodore-64!* (however they are not as efficient there because they're not in zeropage)
In prog8 and assembly code these 'registers' are directly accessible too via
``cx16.r0`` .. ``cx16.r15`` (they're memory mapped uword values)
``cx16.r0`` .. ``cx16.r15`` (these are memory mapped uword values),
``cx16.r0s`` .. ``cx16.r15s`` (these are memory mapped word values),
and ``L`` / ``H`` variants are also available to directly access the low and high bytes of these.
Expressions

2
examples/cx16/sincos.p8
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@ -78,7 +78,7 @@ main {
; circles with "degrees" from 0 to 255
for r in 0 to 255 {
pixelxw = (sin8(r)/2 + 80) as uword
pixelxw = ((sin8(r)/2 as word) + 80) as uword
pixelyb = (cos8(r)/2 + height/2) as ubyte
graphics.plot(pixelxw, pixelyb)
}