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From: John Savard <quadibloc@invalid.invalid>
Newsgroups: comp.arch
Subject: Re: OoO execution
Date: Wed, 16 Jul 2025 14:27:11 -0000 (UTC)
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On Mon, 19 May 2025 22:04:22 +0200, Terje Mathisen wrote:
> quadibloc wrote:

>> The Pentium II (and Pentium Pro) also only used OoO for floating-point,
>> while the 68050 only used OoO for integers!
> 
> Huh???
> 
> The Pentium (all versions) had two pipes (u & v), both in-order, and
> with severe limitations on which opcodes could run in v in parallel with
> the primary opcode in the u pipe.
> 
> The P6/PentiumPro OTOH does true OoO for all instruction types.
> 
> John, you are usually much better informed!

I had read somewhere that the Pentium Pro and the Pentium II, like the 
System/360 Model 91, were OoO only in their floating-point pipelines. If 
that source was faulty, and better sources say differently, I'll need to 
check on it.

John Savard