Re: OoO execution

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