no-altivec assembler option

Daniel Kegel
Mon Oct 4 21:47:00 GMT 2004

Rohan Chitradurga wrote:
> I am trying to cross compile an application for a ppc750 using a tool chain
> that uses gcc 3.3.3, glibc 2.3.2 and bin utils 2.15. Passing "-Wa,
> -maltivec" to the compiler works and the application compiles but passing
> "-Wa,-mno-altivec" doesnt.  I get a assembler error "invalid switch,
> -mno-altivec". My target hardware doesnt have a altivec unit though. Can
> anyone tell me why the assembler will accept one option but not the other ?
> Not specifying any assembler option results in errors "invalid opcode stvx,
> mtvrsave, mfvrsave etc". 

Hi Rohan!
You don't want an assembler option, you want a compiler
option, otherwise the compiler will send altivec code
to the assembler, and no assembler option can save you then.
Actually, if your cross-compiler was specifically built to
target the ppc750 by default, you shouldn't need to give any options at all.

Can you give more details, e.g.
What does the cross-compiler output when you run it with just the -v option?
What's the smallest program this problem occurs for?
How was the cross-compiler built?


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