>>>>> "anthony" == anthony <a...@gc5.uk> writes:
> Hello, after reading the gforth manual, the list archive and the
> comp.lang.forth newsgroup I was unable to find any documentation or an
> example with a loop in ASM64 and ABI-CODE. I expected something like
> this:
> ABI-CODE TEST 0 # R10 MOV L1: 1 # R10 ADD 10 # R10 CMP L1
> REL) JNZ RET END-CODE
I think, you most of Gforth's assemblers supply forth-like control flow
words, to compile branches, using the stack to resolve forward/backwards
branch references (no labels), i.e. write something like
BEGIN
...
10 # R10 CMP
LE UNTIL
Looking at amd64/asm.fs, I see that condition-codes are supported in
"assembler" as well as "operator" syntax:
$10 cond: vs vc u< u>= 0= 0<> u<= u> 0< 0>= ps pc < >= <= >
$10 cond: o no b nb z nz be nbe s ns pe po l nl le nle
I.e. you could write '<= UNTIL' as well as 'LE UNTIL'
See also Gforth's manual or the amd64/asm.fs implementation:
https://www.complang.tuwien.ac.at/forth/gforth/Docs-html/Common-Assembler.html
https://git.savannah.gnu.org/cgit/gforth.git/tree/arch/amd64/asm.fs
cheers,
David
