Basic SIMD reduction support.

Rationale:
Enables vectorization of x += .... for very basic (simple, same-type)
constructs. Paves the way for more complex (narrower and/or mixed-type)
constructs, which will be handled by the next CL.

This is a revert^2 of I7880c135aee3ed0a39da9ae5b468cbf80e613766
and thus a revert  of I1c1c87b6323e01442e8fbd94869ddc9e760ea1fc

PS1-2 shows what needed to change, with regression tests

Test: test-art-host test-art-target

Bug: 64091002, 65212948
Change-Id: I2454778dd0ef1da915c178c7274e1cf33e271d0f

1 files changed, 18 insertions, 10 deletions

diff --git a/compiler/optimizing/code_generator_vector_mips.cc b/compiler/optimizing/code_generator_vector_mips.cc
index 6bf28ab1a3..c2fbf7f04b 100644
--- a/compiler/optimizing/code_generator_vector_mips.cc
+++ b/compiler/optimizing/code_generator_vector_mips.cc
@@ -88,19 +88,11 @@ void InstructionCodeGeneratorMIPS::VisitVecReplicateScalar(HVecReplicateScalar*
   }
 }
 
-void LocationsBuilderMIPS::VisitVecSetScalars(HVecSetScalars* instruction) {
-  LOG(FATAL) << "No SIMD for " << instruction->GetId();
-}
-
-void InstructionCodeGeneratorMIPS::VisitVecSetScalars(HVecSetScalars* instruction) {
+void LocationsBuilderMIPS::VisitVecExtractScalar(HVecExtractScalar* instruction) {
   LOG(FATAL) << "No SIMD for " << instruction->GetId();
 }
 
-void LocationsBuilderMIPS::VisitVecSumReduce(HVecSumReduce* instruction) {
-  LOG(FATAL) << "No SIMD for " << instruction->GetId();
-}
-
-void InstructionCodeGeneratorMIPS::VisitVecSumReduce(HVecSumReduce* instruction) {
+void InstructionCodeGeneratorMIPS::VisitVecExtractScalar(HVecExtractScalar* instruction) {
   LOG(FATAL) << "No SIMD for " << instruction->GetId();
 }
 
@@ -133,6 +125,14 @@ static void CreateVecUnOpLocations(ArenaAllocator* arena, HVecUnaryOperation* in
   }
 }
 
+void LocationsBuilderMIPS::VisitVecReduce(HVecReduce* instruction) {
+  CreateVecUnOpLocations(GetGraph()->GetArena(), instruction);
+}
+
+void InstructionCodeGeneratorMIPS::VisitVecReduce(HVecReduce* instruction) {
+  LOG(FATAL) << "No SIMD for " << instruction->GetId();
+}
+
 void LocationsBuilderMIPS::VisitVecCnv(HVecCnv* instruction) {
   CreateVecUnOpLocations(GetGraph()->GetArena(), instruction);
 }
@@ -818,6 +818,14 @@ void InstructionCodeGeneratorMIPS::VisitVecUShr(HVecUShr* instruction) {
   }
 }
 
+void LocationsBuilderMIPS::VisitVecSetScalars(HVecSetScalars* instruction) {
+  LOG(FATAL) << "No SIMD for " << instruction->GetId();
+}
+
+void InstructionCodeGeneratorMIPS::VisitVecSetScalars(HVecSetScalars* instruction) {
+  LOG(FATAL) << "No SIMD for " << instruction->GetId();
+}
+
 void LocationsBuilderMIPS::VisitVecMultiplyAccumulate(HVecMultiplyAccumulate* instr) {
   LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instr);
   switch (instr->GetPackedType()) {