Apple-2-SW/prog8
1
0
Fork 0
mirror of https://github.com/irmen/prog8.git synced 2025-12-20 12:19:39 +00:00
Code Issues Projects Releases Wiki Activity

fix byte subtract from long

Browse Source 
fix IR register check error for %ir segments
This commit is contained in:
Irmen de Jong
2025-12-06 13:56:23 +01:00
parent 0f433055a7
commit c693be0dd6
4 changed files with 70 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
docs/source/todo.rst
View File

@@ -66,7 +66,9 @@ Future Things and Ideas
IR/VM
-----
- optimize float<0 float==0 float>0 to use SGN instruction? Check what code is generated for other data types.
- replace LOADIX/STOREIX with LOADFIELD/STOREFIELD
- extend the index range from 0-255 to 0-32767 in the LOADX, STOREX, LOADFIELD, STOREFIELD etc instructions (not compatible with 8 bit 6502, but the 68000 can use that)
- if float<0 / if word<0 uses sgn or load, but still use a bgt etc instruction after that with a #0 operand even though the sgn and load instructions sets the status bits already, so just use bstneg etc
- add and sub instructions should modify the status flags so an explicit compare to zero can be avoided for example: if cx16.r0sL + cx16.r1sL <= 0 now compiles into: addr.b r10,r11 / bgts.b r10,#0,label
- getting it in shape for code generation: the IR file should be able to encode every detail about a prog8 program (the VM doesn't have to actually be able to run all of it though!)
- fix call() return value handling (... what's wrong with it again?)
@@ -102,7 +104,6 @@ IR/VM
- implement more TODOs in AssignmentGen
- do something with the 'split' tag on split word arrays
- add more optimizations in IRPeepholeOptimizer, implement the TODOs in there at least
- extend the index range from 0-255 to 0-32767 in the LOADX, STOREX, LOADFIELD, STOREFIELD etc instructions (not compatible with 8 bit 6502, but the 68000 can use that)
- idea: replace all scalar variables that are not @shared by an allocated register. Keep a table of the variable to register mapping (including the datatype)
global initialization values are simply a list of LOAD instructions.
Variables replaced include all subroutine parameters? Or not? So the only variables that remain as variables are arrays and strings.
@@ -122,6 +123,7 @@ Libraries
Optimizations
-------------
- peek(address + offset) and poke(address + offset, value) generate quite large asm segments. Optimize into subroutines for "indexed memory peek/pokes"?
- (6502) optimize if sgn(value)<0: still does a compare with 0 even though SGN sets all status bits.
- longvar = lptr^^ , lptr2^^=lptr^^ now go via temporary registers, optimize this to avoid using temps. (seems like it is dereferencing the pointer first and then assigning the intermediate value)
- optimize inplaceLongShiftRight() for byte aligned cases