Hi Steve,
Thanks for the information. I know the symbol should be unique.
Actually, I changed the symbol many time (very unique), but the compiler
still complains the same thing. If I move the same code (such as a
function) to another code file, then everything is fine. I am just
confused...
Steve Underwood wrote:
Haodong Wang wrote:
Hi,
Sometime I have a strange problem when I do jump in my assembly code
(embedded in C), the compiler always complains "Error: symbol 'L1' is
already defined". I changed the symbol, but it still complains the
same problem. Is that the bug in mspgcc? Any solution to get
around? Thanks!
" mov #1000, r8 \n"
"L1: \n"
" mov #1000, r9 \n"
......
" jnz L1 \n"
haodong
Defining L1 creates a symbol in the assembly language code with a
fixed name. If you do that more than once you will get an error tht
the symbol is already defined. If you try something like the following
that doesn't happen, as the actual names of the labels are generated
dynamically (I just grabbed a suitable example from my own source
code. This does an efficient Q1.15 multiply for machines with no
hardware multiplier).
Steve
__asm__ (
" tst %[x] \n"
" jge 2f \n"
" mov #-1,%[x1] \n"
" jmp 2f \n"
"6: \n"
" add %[x],%A[z] \n"
" addc %[x1],%B[z] \n"
"1: \n"
" rla %[x] \n"
" rlc %[x1] \n"
"2: \n"
" rra %[y] \n"
" jc 5f \n"
" jne 1b \n"
" jmp 4f \n"
"5: \n"
" sub %[x],%A[z] \n"
" subc %[x1],%B[z] \n"
"3: \n"
" rla %[x] \n"
" rlc %[x1] \n"
" rra %[y] \n"
" jnc 6b \n"
" cmp #0xFFFF,%[y] \n"
" jne 3b \n"
"4: \n"
//Shift to Q1.15 format (i.e. the top 16 bits are returned)
" rla %A[z] \n"
" rlc %B[z] \n"
" mov %B[z],%[x1] \n"
: [z] "+r"(z), [x1] "+r"(x1)
: [x] "r"(x), [y] "r"(y));
-------------------------------------------------------
This SF.Net email is sponsored by the JBoss Inc. Get Certified Today
Register for a JBoss Training Course. Free Certification Exam
for All Training Attendees Through End of 2005. For more info visit:
http://ads.osdn.com/?ad_id=7628&alloc_id=16845&op=click
_______________________________________________
Mspgcc-users mailing list
Mspgcc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mspgcc-users
