Reduce default tile size used by default to 64 from 128 to expose more parallelism (#6752)

iree/compiler/Codegen/LLVMCPU/KernelDispatch.cpp

diff --git a/iree/compiler/Codegen/LLVMCPU/KernelDispatch.cpp b/iree/compiler/Codegen/LLVMCPU/KernelDispatch.cpp
index a74a175..f65e912 100644
--- a/iree/compiler/Codegen/LLVMCPU/KernelDispatch.cpp
+++ b/iree/compiler/Codegen/LLVMCPU/KernelDispatch.cpp
@@ -79,7 +79,7 @@
     "iree-codegen-llvm-generic-ops-workgroup-size",
     llvm::cl::desc(
         "linalg.generic and linalg.indexed_generic workgroup tile size"),
-    llvm::cl::init(128));
+    llvm::cl::init(64));
 
 /// Sets the lowering configuration for dispatch region with root op that
 /// implements the contraction operation interface.

iree/compiler/Codegen/LLVMCPU/test/materialize_launch_configuration.mlir

diff --git a/iree/compiler/Codegen/LLVMCPU/test/materialize_launch_configuration.mlir b/iree/compiler/Codegen/LLVMCPU/test/materialize_launch_configuration.mlir
index ba0ee07..9c8a4c1 100644
--- a/iree/compiler/Codegen/LLVMCPU/test/materialize_launch_configuration.mlir
+++ b/iree/compiler/Codegen/LLVMCPU/test/materialize_launch_configuration.mlir
@@ -169,8 +169,8 @@
     }
   }
 }
-//  CHECK-DAG: #[[CONFIG:.+]] = {tileSizes = {{\[}}[128, 128]{{\]}}}
-//  CHECK-DAG: #[[MAP0:.+]] = affine_map<()[s0] -> (s0 ceildiv 128)>
+//  CHECK-DAG: #[[CONFIG:.+]] = {tileSizes = {{\[}}[64, 64]{{\]}}}
+//  CHECK-DAG: #[[MAP0:.+]] = affine_map<()[s0] -> (s0 ceildiv 64)>
 //      CHECK: hal.executable.entry_point @add
 // CHECK-NEXT:   (%[[ARG0:[a-zA-Z0-9_]+]]: index
 // CHECK-SAME:    %[[ARG1:[a-zA-Z0-9_]+]]: index
@@ -265,8 +265,8 @@
       }
     }
   }
-//  CHECK-DAG: #[[CONFIG:.+]] = {tileSizes = {{\[}}[0, 128, 128, 128]{{\]}}}
-//  CHECK-DAG: #[[MAP0:.+]] = affine_map<()[s0] -> (s0 ceildiv 128)>
+//  CHECK-DAG: #[[CONFIG:.+]] = {tileSizes = {{\[}}[0, 64, 64, 64]{{\]}}}
+//  CHECK-DAG: #[[MAP0:.+]] = affine_map<()[s0] -> (s0 ceildiv 64)>
 //      CHECK: hal.executable.entry_point @add4D
 // CHECK-NEXT:   (%[[ARG0:[a-zA-Z0-9_]+]]: index
 // CHECK-SAME:    %[[ARG1:[a-zA-Z0-9_]+]]: index