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/code_generator_vector_x86.cc b/compiler/optimizing/code_generator_vector_x86.cc
index 2502275..c52ecc7 100644
--- a/compiler/optimizing/code_generator_vector_x86.cc
+++ b/compiler/optimizing/code_generator_vector_x86.cc
@@ -1143,6 +1143,14 @@
LOG(FATAL) << "No SIMD for " << instruction->GetId();
}
+void LocationsBuilderX86::VisitVecDotProd(HVecDotProd* instruction) {
+ LOG(FATAL) << "No SIMD for " << instruction->GetId();
+}
+
+void InstructionCodeGeneratorX86::VisitVecDotProd(HVecDotProd* instruction) {
+ LOG(FATAL) << "No SIMD for " << instruction->GetId();
+}
+
// Helper to set up locations for vector memory operations.
static void CreateVecMemLocations(ArenaAllocator* allocator,
HVecMemoryOperation* instruction,