By: Brett (ggtgp.delete@this.yahoo.com), March 6, 2015 11:57 am
Room: Moderated Discussions
David Kanter (dkanter.delete@this.realworldtech.com) on March 6, 2015 12:42 am wrote:
> > A57 is definitely more than 20% faster at the same clock, as you can easily conclude
> > from various benchmarks (eg. Geekbench shows 40% single threaded gain overall
> > in AArch32 mode between Galaxy S5 and Galaxy S6 at the same clock).
>
> That's a bogus comparison since Geekbench contains lots of AES
> stuff, and ARM64 contains special instructions for AES.
Are you accusing ARM of pulling an Intel, making sure that benchmarks are dominated by feature X right before Intel adds feature X to the instruction set. ;)
This tactic is old hat, blatantly obvious for over a decade. Happy to see that ARM is playing by the rules of the CPU market.
> What's the speedup on GCC?
GCC is the worst pointer chasing spaghetti on the planet. You have to brute force tweak hundreds of CPU details so as not to get burned by one of a hundred glass jaws that will cripple your performance. This takes billions of dollars that AMD does not have, much less tiny ARM.
Unless IBM gets into the ARM64 business Intel is going to dominate the GCC comparison for the next two decades, longer than I expect Intel to survive as dominate company. $15 SOC's don't generate the sort of revenues that justify optimizing for GCC.
> David
> > A57 is definitely more than 20% faster at the same clock, as you can easily conclude
> > from various benchmarks (eg. Geekbench shows 40% single threaded gain overall
> > in AArch32 mode between Galaxy S5 and Galaxy S6 at the same clock).
>
> That's a bogus comparison since Geekbench contains lots of AES
> stuff, and ARM64 contains special instructions for AES.
Are you accusing ARM of pulling an Intel, making sure that benchmarks are dominated by feature X right before Intel adds feature X to the instruction set. ;)
This tactic is old hat, blatantly obvious for over a decade. Happy to see that ARM is playing by the rules of the CPU market.
> What's the speedup on GCC?
GCC is the worst pointer chasing spaghetti on the planet. You have to brute force tweak hundreds of CPU details so as not to get burned by one of a hundred glass jaws that will cripple your performance. This takes billions of dollars that AMD does not have, much less tiny ARM.
Unless IBM gets into the ARM64 business Intel is going to dominate the GCC comparison for the next two decades, longer than I expect Intel to survive as dominate company. $15 SOC's don't generate the sort of revenues that justify optimizing for GCC.
> David
