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Irmen de Jong 2023-11-15 22:24:10 +01:00
parent 42db3085df
commit 09d506194f
2 changed files with 17 additions and 10 deletions
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3
docs/source/todo.rst
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@ -2,9 +2,8 @@
TODO
====
- [on branch: shortcircuit] investigate McCarthy evaluation again? this may also reduce code size perhaps for things like if a>4 or a<2 ....
- [on branch: ir-less-branch-opcodes] IR: reduce the number of branch instructions such as BEQ, BEQR, etc (gradually), replace with CMP(I) + status branch instruction
- IR: reduce amount of CMP/CMPI after instructions that set the status bits correctly (LOADs? INC? Bitwise operations, etc), but only after setting the status bits is verified!
- [on branch: shortcircuit] investigate McCarthy evaluation again? this may also reduce code size perhaps for things like if a>4 or a<2 ....
...

24
intermediate/src/prog8/intermediate/IRInstructions.kt
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@ -83,19 +83,27 @@ bstpos address - branch to location if Status bit Negat
bstneg address - branch to location if Status bit Negative is set
bstvc address - branch to location if Status bit Overflow is clear
bstvs address - branch to location if Status bit Overflow is set
(unsigned comparison branches:)
bgt reg1, value, address - jump to location in program given by location, if reg1 > immediate value (unsigned)
bgts reg1, value, address - jump to location in program given by location, if reg1 > immediate value (signed)
bgtr reg1, reg2, address - jump to location in program given by location, if reg1 > reg2 (unsigned)
bgtsr reg1, reg2, address - jump to location in program given by location, if reg1 > reg2 (signed)
blt reg1, value, address - jump to location in program given by location, if reg1 < immediate value (unsigned)
blts reg1, value, address - jump to location in program given by location, if reg1 < immediate value (signed)
bgtr reg1, reg2, address - jump to location in program given by location, if reg1 > reg2 (unsigned)
'bltr' reg1, reg2, address - jump to location in program given by location, if reg1 < reg2 (unsigned) ==> use bgtr with swapped operands
bge reg1, value, address - jump to location in program given by location, if reg1 >= immediate value (unsigned)
bges reg1, value, address - jump to location in program given by location, if reg1 >= immediate value (signed)
bger reg1, reg2, address - jump to location in program given by location, if reg1 >= reg2 (unsigned)
bgesr reg1, reg2, address - jump to location in program given by location, if reg1 >= reg2 (signed)
ble reg1, value, address - jump to location in program given by location, if reg1 <= immediate value (unsigned)
bger reg1, reg2, address - jump to location in program given by location, if reg1 >= reg2 (unsigned)
'bler' reg1, reg2, address - jump to location in program given by location, if reg1 <= reg2 (unsigned) ==> use bger with swapped operands
(signed comparison branches:)
bgts reg1, value, address - jump to location in program given by location, if reg1 > immediate value (signed)
blts reg1, value, address - jump to location in program given by location, if reg1 < immediate value (signed)
bgtsr reg1, reg2, address - jump to location in program given by location, if reg1 > reg2 (signed)
'bltsr' reg1, reg2, address - jump to location in program given by location, if reg1 < reg2 (signed) ==> use bgtsr with swapped operands
bges reg1, value, address - jump to location in program given by location, if reg1 >= immediate value (signed)
bles reg1, value, address - jump to location in program given by location, if reg1 <= immediate value (signed)
( NOTE: there are no bltr/bler instructions because these are equivalent to bgtr/bger with the register operands swapped around.)
bgesr reg1, reg2, address - jump to location in program given by location, if reg1 >= reg2 (signed)
'blesr' reg1, reg2, address - jump to location in program given by location, if reg1 <= reg2 (signed) ==> use bgesr with swapped operands
sz reg1, reg2 - set reg1=1 if reg2==0, else 0
snz reg1, reg2 - set reg1=1 if reg2!=0, else 0
seq reg1, reg2, reg3 - set reg1=1 if reg2 == reg3, else 0