Which flags do I have to use to get the best out of my 7970?
ATM -v 1, but who knows once I finish this more optimized kernel.
Any faster so far?
This is a two stage project. I'm almost done stage 1.
Old kernel:
-v 1 sdk 2.6 = 883 ops 13 registers, 2.1 = 803 ops 17 registers
-v 2 sdk 2.6 = 1503 ops 21 registers, 2.1 = 1362 ops 21 registers
2.6 is 10% slower than 2.1.
New kernel:
-v 1 sdk 2.6 = 827 ops 21 registers, 828 ops 20 registers
-v 2 sdk 2.6 = 1464 36 registers, 2.1 = 1402 ops 37 registers
2.6 is 4% slower than 2.1.
New vs old:
-v 1 =~ 7% faster 2.6, 3% slower 2.1, 2.6 is 21% away from minimum target of 681 ops
-v 2 =~ 3% slower 2.6, 3% slower 2.1, 2.6 is 8% away from minimum target of 1362 ops
After looking at the ops generated in the .isa output, I'm clearly starting to force 2.6 to act more like the 2.1 results, so I seem to be getting somewhere. The hard part is going to be ordering instructions to properly saturate ALU clauses on vliw5 and GCN both.
