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[Lightning] Re: Bug in x86_64

From: Paolo Bonzini
Subject: [Lightning] Re: Bug in x86_64
Date: Thu, 12 Jun 2008 22:23:39 -0700
User-agent: Thunderbird (Macintosh/20080421)

Unfortunately, I don't know the 64bit port of lightning well enough to fix it directly. It seems that reusing RSI/RDI that are registers holding Arg1 / Arg0 for the GPR of lightning may be a bad idea. Maybe using two from the range R8..R11 (the caller saved ones) would be better? [I do not know whether lightning uses all the available registers or not] a move from an input register to anything that lightning supports (i.e., R0..R2 or V0..V2) is going to be incorrect when the target is also an input register (i.e., R1,R2,V1,V2).
What are your thoughts?

Oops. Probably it should use those, or use R12/R13 for V1/V2. I'll check it out.


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