Compiler

[Altera_Forum]

http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/mad.gif  

movia at,((90057600)/115200)  28: 00400034 movhi at,0  2c: 0840c354 ori at,at,781  movia at,((90000000+57600)/115200)  30: 00415774 movhi at,1373  34: 0852a014 ori at,at,19072

[Altera_Forum]

I just tried assembling the following code: 

       .set noat        movia at,((90000000+57600)/115200) with the command line: nios2-elf-gcc -c -o test.o test.s nios2-elf-objdump -S test.o And got a pair of instructions which load up the value 781 (decimal).  Which version of the tools are you using?

[Altera_Forum]

Test code as following:# ==================================== 

.set noat _start:  movia at,((90000000+57600)/115200)  movia at,((90057600)/115200)  .end# ==================================== I got these result: [NIOS2 GNU Shell]$ nios2-elf-gcc -c -o test.o test.S [NIOS2 GNU Shell]$ nios2-elf-objdump -S test.o test.o: file format elf32-littlenios2 Disassembly of section .text: 00000000 <_start>:  0: 00415774 movhi at,1373  4: 0852a014 ori at,at,19072  8: 00400034 movhi at,0  c: 0840c354 ori at,at,781 [NIOS2 GNU Shell]$  Why?

[Altera_Forum]

but , got the result with these cmd line: 

[NIOS2 GNU Shell]$ nios2-elf-as -o test.o test.S [NIOS2 GNU Shell]$ nios2-elf-objdump -S test.o test.o: file format elf32-littlenios2 Disassembly of section .text: 00000000 <_start>:  0: 00400034 movhi at,0  4: 0840c344 addi at,at,781  8: 00400034 movhi at,0  c: 0840c344 addi at,at,781 /cygdrive/g/nios2/src/boot_loader [NIOS2 GNU Shell]$

[Altera_Forum]

--- Quote Start ---  originally posted by simon.embed@Mar 16 2005, 10:01 AM test code as following:# ====================================  .set noat _start:  movia at,((90000000+57600)/115200)  movia at,((90057600)/115200)  .end# ==================================== i got these result: [nios2 gnu shell]$ nios2-elf-gcc -c -o test.o test.s [nios2 gnu shell]$ nios2-elf-objdump -s test.o test.o:    file format elf32-littlenios2 disassembly of section .text: 00000000 <_start>:   0:  00415774        movhi  at,1373   4:  0852a014        ori    at,at,19072   8:  00400034        movhi  at,0   c:  0840c354        ori    at,at,781 [nios2 gnu shell]$  why?  --- Quote End ---   What version are you running? If you type nios2-elf-gcc -v this will tell you.  Using your file   .set noat _start: movia at,((90000000+57600)/115200) movia at,((90057600)/115200) .end  With the command lines below I get exactly what you&#39;d expect  [SOPC Builder]$ nios2-elf-gcc -c -o test.o test.S /cygdrive/d [SOPC Builder]$ nios2-elf-objdump -S test.o  test.o: file format elf32-littlenios2  Disassembly of section .text:  00000000 <_start>:  0: 00400034 movhi at,0  4: 0840c344 addi at,at,781  8: 00400034 movhi at,0  c: 0840c344 addi at,at,781

[Altera_Forum]

Thanks, rugbybloke. I got it. I have included some head file(#include "macros.h") in source file, which get wrong. Instruction MOVIA was redefined in that head file!

[Altera_Forum]

maybe the compiler bug for the following test code:# test.S# define ALT_CPU_FREQ 90000000# define BAUD_RATE 2400 //1200# define C_DIVISOR ((ALT_CPU_FREQ+BAUD_RATE/2)/BAUD_RATE) 

.equ A_DIVISOR , ((ALT_CPU_FREQ+BAUD_RATE/2)/BAUD_RATE)   .macro MOVUIK32 _reg,_val  .if (\_val >>16) == 0  MOVUI \_reg,%lo(\_val)  .elseif (\_val <<16) == 0  MOVHI \_reg,%hi(\_val)  .else  MOVIA \_reg,\_val  .endif  .endm   .section .text  .align 2  .set noat _start:  MOVUIK32 r2,C_DIVISOR  MOVUIK32 r3,A_DIVISOR  .end  You may change the valu of ALT_CPU_FREQ and BAUD_RATE macros, and then check the compiling result!