Re: Questionn: mul functions for v850e

[markku dot pihlajamaa at luukku dot com]

Perhaps you should write -mv850e instead of -Wa,-mv850e.
I have tried this (gcc version 2.96-xscale-010827)
and seen a mul instruction in the assembly list.

Markku


> -----Original Message-----
> From: unno-y@necat.nec.co.jp [mailto:unno-y@necat.nec.co.jp]
> Sent: Tuesday, June 04, 2002 10:09 AM
> To: crossgcc@sources.redhat.com
> Subject: Questionn: mul functions for v850e
>
>
> Hi, everybody,
>
> My target board has not v850 but v850e processor and
> I am compiling test code(mul.c) with cross GCC for target=v850-elf.
>
> My question are:
> 1) Does GNU 2.95.2 support v850e?
>    I configured GCC with options below:
>
>    configure --target=v850-elf --prefix=/proj/tools --with-gnu-as
> --with-gnu-ld
>
> 2) Why does not GCC generate muliply code sets?
>    GCC generates __mulsi3 sub routine call.
>
> 3) Please show me how to generate multiply code sets for v850e!
>
> I atatched information for this issue.
>
> Thank you,
> Yoshinori Unno
>
>
> --------------
> o complie option
>
> v850-elf/bin/gcc -c -S -Wall -Wno-format -Wimplicit -Wparentheses \
> -Wunused -fconserve-space -fno-exceptions -fno-rtti -O2 \
> -fno-expensive-optimizations -mno-pro \
> log-function -gstabs3 -ffixed-r20 -ffixed-r21 -fpack-struct \
> -Wa,-mv850e mul.c
>
> --------------
> o source list(mul.c)
>
>   int func(int b)
>   {
>       return~b;
>   }
>
>   int main()
>   {
>
>       int a= 3;
>       int b= 4;
>       int c;
>
>       c= a * func(b);
>       return c;
>   }
>
> --------------
> o assembly list
>
>         .file   "mul.c"
>         .section .text
> .Ltext0:
>         .align 1
>         .global _func
>         .type    _func,@function
> _func:
> .LM1:
> .LM2:
>         not r6,r10
>         jmp [r31]
> .Lfe1:
>         .size    _func,.Lfe1-_func
>         .global ___mulsi3
>         .align 1
> .stabs "main:F(0,1)",36,0,0,_main
>         .global _main
>         .type    _main,@function
> _main:
> .LM3:
> .LM4:
> .LBB2:
> .LM5:
>         addi -20,sp,sp
>         st.w r31,16[sp]
>         mov 4,r6
>         jarl _func,r31
>         mov 3,r6
>         mov r10,r7
>         jarl ___mulsi3,r31
> .LM6:
>         ld.w 16[sp],r31
>         addi 20,sp,sp
>         jmp [r31]
> .LM7:
> .LBE2:
> .Lfe2:
>         .size    _main,.Lfe2-_main
>         .text
> Letext:
>         .ident  "GCC: (GNU) 2.95.2 19991024 (release)"
>
>
> ------
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