abuse at cabal.org.uk
Tue Jul 19 10:04:11 CDT 2016
On Tue, Jul 19, 2016 at 03:30:19PM +0200, Liam Proven wrote:
> There's a hint here, though:
>From there, it seems to be saying that the essence of the invention is that the
ARM ISA is RISC, it is a load-store architecture, and the CPU was pipelined.
RISC implies a load-store architecture, so that claim is redundant.
Pipelining is an older idea: the 1979-vintage 68000 does it, and the 1982-vintage
68010 even detects certain string/loop instructions in its pipeline and avoids
re-fetching them from memory when repeating the sequence.
IMO, it's the predicated instructions that is ARM's special sauce and the real
innovation that gives it a performance boost. Without those, it'd be just a 32
bit wide 6502 knockoff.
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