Revert "[mlir] Add nano precision clock to execution engine"

This reverts commit 48d1f09.

Broke the MLIR buildbots

Author: joker-eph

mlir/lib/ExecutionEngine/RunnerUtils.cpp

@@ -14,7 +14,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "mlir/ExecutionEngine/RunnerUtils.h"
-#include <chrono>
 
 extern "C" void
 _mlir_ciface_print_memref_shape_i8(UnrankedMemRefType<int8_t> *M) {
@@ -76,14 +75,6 @@ extern "C" void _mlir_ciface_print_memref_f64(UnrankedMemRefType<double> *M) {
   impl::printMemRef(*M);
 }
 
-extern "C" int64_t _mlir_ciface_nano_time() {
-  auto now = std::chrono::high_resolution_clock::now();
-  auto duration = now.time_since_epoch();
-  auto nanoseconds =
-      std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
-  return nanoseconds.count();
-}
-
 extern "C" void print_memref_i32(int64_t rank, void *ptr) {
   UnrankedMemRefType<int32_t> descriptor = {rank, ptr};
   _mlir_ciface_print_memref_i32(&descriptor);

mlir/test/python/execution_engine.py

@@ -358,36 +358,3 @@ def testSharedLibLoad():
 
 
 run(testSharedLibLoad)
-
-
-#  Test that nano time clock is available.
-# CHECK-LABEL: TEST: testNanoTime
-def testNanoTime():
-  with Context():
-    module = Module.parse("""
-      module {
-      func @main() attributes { llvm.emit_c_interface } {
-        %now = call @nano_time() : () -> i64
-        %memref = memref.alloca() : memref<1xi64>
-        %c0 = arith.constant 0 : index
-        memref.store %memref[%c0] : memref<1xi64>
-        call @print_memref_i64(%memref) : (memref<*xi64) -> ()
-        return
-      }
-      func private @nano_time() -> i64 attributes { llvm.emit_c_interface }
-      func private @print_memref_i64(memref<*xi64>) attributes { llvm.emit_c_interface }
-    }""")
-
-    execution_engine = ExecutionEngine(
-        lowerToLLVM(module),
-        opt_level=3,
-        shared_libs=[
-            "../../../../lib/libmlir_runner_utils.so",
-            "../../../../lib/libmlir_c_runner_utils.so"
-        ])
-    execution_engine.invoke("main", arg0_memref_ptr)
-    # CHECK: Unranked Memref
-    # CHECK: [{{.*}}]
-
-
-run(testNanoTime)