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Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: Depend behavior of cmp instruct

From: Torbjorn Granlund
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: Depend behavior of cmp instructions only on instruction encoding
Date: Wed, 08 May 2013 18:31:57 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (berkeley-unix)

Aurelien Jarno <address@hidden> writes:

  Don't people read what I write? From one of my previous email:
I do...and even scrutinise it for grammar errors.  ;-)

  Quoting the "IBM PowerPC Microprocessor Family: The Programming               
  Environments Manual for 32 and 64-bit Microprocessors":                       
  | Note: In 32-bit implementations, if L = 1 the instruction form is invalid.
  This doesn't match what your contact says.
I think you're reading too much into that wording.

It is perhaps intended to mean that L = 1 makes no sense, that it will
not have the desired effect.

(I don't much like the way IBM's powerpc docs are written.  They ought
to be much more unambiguous, and could be less wordy.)


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