[Bug gas/9782] Additional switches to disallow processor supplementary instructions

[markhobley at yahoo dot co dot uk]

------- Additional Comments From markhobley at yahoo dot co dot uk  2009-01-26 
13:16 -------
Subject: Re:  Additional switches to disallow processor supplementary 
instructions

> That is pretty much how it is implemented. But I can't
> do it for
> any arbitrary instructions. The instruction availability
> has to be
> able to detected at run-time via CPUID insn.

My suggestion was to disable existing instructions only. I didn't mean if 
enable an instruction if it is not disabled. That functionality would remain as 
it is now, with availability of instructions being based on the build 
architecture.

The cpuid is not really relevant, because it is possible to be building for the 
same architecture but the target computer has different flags. (However 
applying the proposed --nosupplementaryinstructions, would solve that issue 
with code being portable across all machines of the same architecture.)

I must confess that when I posted this, I was one version behind on the 
binutils and there was a problem with invalid instructions making it into the 
code. There appears to have been a fix since then. However, the switches would 
still be useful IMHO.

Mark.





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http://sourceware.org/bugzilla/show_bug.cgi?id=9782

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