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optimize cmp word equal/notequal

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This commit is contained in:
Irmen de Jong 2022-11-29 20:09:10 +01:00
parent eee805183c
commit 10760a53a8
3 changed files with 54 additions and 97 deletions
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16
codeGenCpu6502/src/prog8/codegen/cpu6502/AsmGen.kt
View File

@ -2456,11 +2456,9 @@ $repeatLabel lda $counterVar
assignExpressionToRegister(right, RegisterOrPair.AY)
} else {
pushCpuStack(DataType.UWORD, left)
assignExpressionToRegister(right, RegisterOrPair.AY)
out(" sta P8ZP_SCRATCH_REG")
popCpuStack(DataType.UWORD, "P8ZP_SCRATCH_W2")
out(" lda P8ZP_SCRATCH_REG")
// TODO optimize this path..... CMP_OPT
assignExpressionToVariable(right, "P8ZP_SCRATCH_W2", DataType.UWORD, null)
restoreRegisterStack(CpuRegister.Y, false)
restoreRegisterStack(CpuRegister.A, false)
}
out("""
cmp P8ZP_SCRATCH_W2
@ -2544,11 +2542,9 @@ $repeatLabel lda $counterVar
assignExpressionToRegister(right, RegisterOrPair.AY)
} else {
pushCpuStack(DataType.UWORD, left)
assignExpressionToRegister(right, RegisterOrPair.AY)
out(" sta P8ZP_SCRATCH_REG")
popCpuStack(DataType.UWORD, "P8ZP_SCRATCH_W2")
out(" lda P8ZP_SCRATCH_REG")
// TODO optimize this path..... CMP_OPT
assignExpressionToVariable(right, "P8ZP_SCRATCH_W2", DataType.UWORD, null)
restoreRegisterStack(CpuRegister.Y, false)
restoreRegisterStack(CpuRegister.A, false)
}
out("""
cmp P8ZP_SCRATCH_W2

2
docs/source/todo.rst
View File

@ -3,8 +3,6 @@ TODO
For next release
^^^^^^^^^^^^^^^^
- optimize cmp's that can use the variable directly out(" cmp $.....
- optimize cmp word equal/notequal search for CMP_OPT
- 6502 codegen: make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as ``p8v_``? Or not worth it (most 3 letter opcodes as variables are nonsensical anyway)
then we can get rid of the instruction lists in the machinedefinitions as well. This is already no problem at all in the IR codegen.
- create BSS section in output program and put StStaticVariables in there with bss=true. Don't forget to add init code to zero out everything that was put in bss. If array in bss->only zero ONCE! So requires self-modifying code

127
examples/test.p8
View File

@ -1,11 +1,17 @@
%import textio
%zeropage dontuse
; base level code size: $279
main {
bool[1] expected = [ true ]
uword[1] expectedw = [4242 ]
sub get() -> bool {
ubyte xx
xx = 1
%asm {{
stz P8ZP_SCRATCH_W1
stz P8ZP_SCRATCH_W1+1
@ -14,9 +20,11 @@ main {
stz P8ZP_SCRATCH_REG
stz P8ZP_SCRATCH_B1
}}
return true
return xx
}
sub same() -> bool {
ubyte xx
xx = 1
%asm {{
stz P8ZP_SCRATCH_W1
stz P8ZP_SCRATCH_W1+1
@ -25,10 +33,11 @@ main {
stz P8ZP_SCRATCH_REG
stz P8ZP_SCRATCH_B1
}}
return true
return xx
}
sub getw() -> uword {
uword xx=4242
%asm {{
stz P8ZP_SCRATCH_W1
stz P8ZP_SCRATCH_W1+1
@ -37,9 +46,10 @@ main {
stz P8ZP_SCRATCH_REG
stz P8ZP_SCRATCH_B1
}}
return 4242
return xx
}
sub samew() -> uword {
uword xx=4242
%asm {{
stz P8ZP_SCRATCH_W1
stz P8ZP_SCRATCH_W1+1
@ -48,9 +58,22 @@ main {
stz P8ZP_SCRATCH_REG
stz P8ZP_SCRATCH_B1
}}
return 4242
return xx
}
sub differentw() -> uword {
uword xx=9999
%asm {{
stz P8ZP_SCRATCH_W1
stz P8ZP_SCRATCH_W1+1
stz P8ZP_SCRATCH_W2
stz P8ZP_SCRATCH_W2+1
stz P8ZP_SCRATCH_REG
stz P8ZP_SCRATCH_B1
}}
return xx
}
sub one() -> ubyte {
ubyte xx=1
%asm {{
stz P8ZP_SCRATCH_W1
stz P8ZP_SCRATCH_W1+1
@ -59,110 +82,50 @@ main {
stz P8ZP_SCRATCH_REG
stz P8ZP_SCRATCH_B1
}}
return 1
return xx
}
sub start() {
if get() == expected[0]
txt.print("ok\n")
else
txt.print("fail\n")
; this is working fine:
if expected[0] == get()
txt.print("ok\n")
else
txt.print("fail\n")
if getw() == expectedw[0]
txt.print("ok\n")
else
txt.print("fail\n")
; this is working fine:
if expectedw[0] == getw()
txt.print("ok\n")
else
txt.print("fail\n")
; unquals
if get() != expected[0]
txt.print("fail\n")
else
txt.print("ok\n")
; this is working fine:
if expected[0] != get()
txt.print("fail\n")
else
txt.print("ok\n")
if getw() != expectedw[0]
txt.print("fail\n")
else
txt.print("ok\n")
; this is working fine:
if expectedw[0] != getw()
txt.print("fail\n")
else
txt.print("ok\n")
; now with 2 non-simple operands:
if get() == same()
txt.print("ok\n")
else
txt.print("fail\n")
; this is working fine:
if same() == get()
txt.print("ok\n")
else
txt.print("fail\n")
if getw() == samew()
txt.print("ok\n")
else
txt.print("fail\n")
; this is working fine:
if samew() == getw()
txt.print("ok\n")
else
txt.print("fail\n")
; unquals
if get() != same()
txt.print("fail\n")
else
txt.print("ok\n")
; this is working fine:
if same() != get()
txt.print("fail\n")
else
txt.print("ok\n")
if getw() != samew()
txt.print("fail\n")
else
txt.print("ok\n")
; this is working fine:
if samew() != getw()
txt.print("fail\n")
else
txt.print("ok\n")
; pointer stuff
uword ptr = $4000
@(ptr+one()) = 42
if @(ptr+one()) == 42
if getw() == differentw()
txt.print("fail\n")
else
txt.print("ok\n")
if differentw() == getw()
txt.print("fail\n")
else
txt.print("ok\n")
if getw() != differentw()
txt.print("ok\n")
else
txt.print("fail\n")
if differentw() != getw()
txt.print("ok\n")
else
txt.print("fail\n")
}
}