ARM instructions -- CLZ

Clive Davies cdavies@altera.com
Sun Nov 19 23:42:00 GMT 2000


clz is not an ARM instruction, so it won't be supported.

Clive

> -----Original Message-----
> From: Shaun Jackman [ mailto:sjackman@pathwayconnect.com ]
> Sent: 17 November 2000 19:07
> To: crossgcc@sources.redhat.com
> Cc: sdj@sfu.ca
> Subject: ARM instructions -- CLZ
> 
> 
> Does binutils support the ARM CLZ instruction?
> I have an arm7tdmi and am compiling with -mcpu-arm7tdmi.
> 
> This is the macro I'm using...
> 
> #define count_leading_zeroes(a) \
> ({ uint32 __value, __arg = (a); \
>     asm ("clz\t%0, %1": "=r" (__value): "r" (__arg)); \
>     __value; })
> 
> and the C is...
> 
> unsigned count = count_leading_zeroes( num);
> 
> which produces the proper assembler (in the .s file compiling with -S)
> 	clz	r2, r3
> (which makes sense in context)
> 
> Unfortunately, it's a big crash and burn.
> /tmp/ccQbzMp6.s: Assembler messages:
> /tmp/ccQbzMp6.s:17: Error: bad instruction `clz r2,r3'
> 
> Any thoughts?
> 
> Thanks,
> Shaun Jackman
> 
> 
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