ART: ARM64: Support DotProd SIMD idiom.
Implement support for vectorization idiom which performs dot
product of two vectors and adds the result to wider precision
components in the accumulator.
viz. DOT_PRODUCT([ a1, .. , am], [ x1, .. , xn ], [ y1, .. , yn ]) =
[ a1 + sum(xi * yi), .. , am + sum(xj * yj) ],
for m <= n, non-overlapping sums,
for either both signed or both unsigned operands x, y.
The patch shows up to 7x performance improvement on a micro
benchmark on Cortex-A57.
Test: 684-checker-simd-dotprod.
Test: test-art-host, test-art-target.
Change-Id: Ibab0d51f537fdecd1d84033197be3ebf5ec4e455
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 68f1a24..76887f9 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -1453,6 +1453,7 @@
M(VecSetScalars, VecOperation) \
M(VecMultiplyAccumulate, VecOperation) \
M(VecSADAccumulate, VecOperation) \
+ M(VecDotProd, VecOperation) \
M(VecLoad, VecMemoryOperation) \
M(VecStore, VecMemoryOperation) \