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optimized for loop over const bytes, fixed downto 1

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This commit is contained in:
Irmen de Jong 2021-02-13 13:27:06 +01:00
parent 1e22170302
commit f6136891cc
3 changed files with 40 additions and 34 deletions
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38
compiler/src/prog8/compiler/target/c64/codegen/ForLoopsAsmGen.kt
View File

@ -369,7 +369,7 @@ $loopLabel""")
throw AssemblyError("step 0, 1 and -1 should have been handled specifically $stmt") throw AssemblyError("step 0, 1 and -1 should have been handled specifically $stmt")
} }
2 -> { 2 -> {
if(range.last==255) { if(range.last==255 || range.last==254) {
asmgen.out(""" asmgen.out("""
inc $varname inc $varname
beq $endLabel beq $endLabel
@ -377,12 +377,11 @@ $loopLabel""")
bne $loopLabel""") bne $loopLabel""")
} else { } else {
asmgen.out(""" asmgen.out("""
inc $varname
inc $varname
lda $varname lda $varname
cmp #${range.last} cmp #${range.last+2}
beq $endLabel bne $loopLabel""")
inc $varname
inc $varname
jmp $loopLabel""")
} }
} }
-2 -> { -2 -> {
@ -399,12 +398,11 @@ $loopLabel""")
dec $varname dec $varname
bne $loopLabel""") bne $loopLabel""")
else -> asmgen.out(""" else -> asmgen.out("""
dec $varname
dec $varname
lda $varname lda $varname
cmp #${range.last} cmp #${range.last-2}
beq $endLabel bne $loopLabel""")
dec $varname
dec $varname
jmp $loopLabel""")
} }
} }
else -> { else -> {
@ -480,11 +478,10 @@ $loopLabel""")
$endLabel""") $endLabel""")
} else { } else {
asmgen.out(""" asmgen.out("""
lda $varname
cmp #${range.last}
beq $endLabel
inc $varname inc $varname
jmp $loopLabel lda $varname
cmp #${range.last+1}
bne $loopLabel
$endLabel""") $endLabel""")
} }
asmgen.loopEndLabels.pop() asmgen.loopEndLabels.pop()
@ -512,16 +509,15 @@ $endLabel""")
1 -> { 1 -> {
asmgen.out(""" asmgen.out("""
dec $varname dec $varname
jmp $loopLabel bne $loopLabel
$endLabel""") $endLabel""")
} }
else -> { else -> {
asmgen.out(""" asmgen.out("""
lda $varname
cmp #${range.last}
beq $endLabel
dec $varname dec $varname
jmp $loopLabel lda $varname
cmp #${range.last-1}
bne $loopLabel
$endLabel""") $endLabel""")
} }
} }
@ -546,7 +542,6 @@ $loopLabel""")
bne + bne +
lda $varname+1 lda $varname+1
cmp #>${range.last} cmp #>${range.last}
bne +
beq $endLabel beq $endLabel
+ inc $varname + inc $varname
bne $loopLabel bne $loopLabel
@ -574,7 +569,6 @@ $loopLabel""")
bne + bne +
lda $varname+1 lda $varname+1
cmp #>${range.last} cmp #>${range.last}
bne +
beq $endLabel beq $endLabel
+ lda $varname + lda $varname
bne + bne +

1
docs/source/todo.rst
View File

@ -2,7 +2,6 @@
TODO TODO
==== ====
- optimize for loop iterations better to allow proper inx, cpx #value, bne loop instructions (like repeat loop)
- implement the linked_list millfork benchmark - implement the linked_list millfork benchmark
- refactor the asmgen into their own submodule? - refactor the asmgen into their own submodule?

35
examples/test.p8
View File

@ -4,16 +4,29 @@
main { main {
sub start() { sub start() {
txt.print("hello\n") ubyte ib
txt.column(3) uword iw
txt.print("hello2\n") ubyte xx
txt.column(8)
txt.print("hello3\n") xx=0
txt.column(34)
txt.print("hello4\n") for ib in 241 to 253 step 2 {
txt.column(1) txt.print_ub(ib)
txt.print("hello5\n") txt.nl()
txt.column(0) xx++
txt.print("hello6\n") }
for ib in 10 downto 2 step -2 {
txt.print_ub(ib)
txt.nl()
xx--
}
for ib in 6 downto 0 step -2 {
txt.print_ub(ib)
txt.nl()
xx--
}
txt.print_ub(xx)
} }
} }