1 //===- CRunnerUtils.cpp - Utils for MLIR execution ------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements basic functions to manipulate structured MLIR types at
10 // runtime. Entities in this file are meant to be retargetable, including on
11 // targets without a C++ runtime, and must be kept C compatible.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "mlir/ExecutionEngine/CRunnerUtils.h"
16 
17 #ifndef _WIN32
18 #include <alloca.h>
19 #include <sys/time.h>
20 #else
21 #include "malloc.h"
22 #endif // _WIN32
23 
24 #include <cinttypes>
25 #include <cstdio>
26 #include <string.h>
27 
28 #ifdef MLIR_CRUNNERUTILS_DEFINE_FUNCTIONS
29 
30 // Small runtime support "lib" for vector.print lowering.
31 // By providing elementary printing methods only, this
32 // library can remain fully unaware of low-level implementation
33 // details of our vectors. Also useful for direct LLVM IR output.
34 extern "C" void printI64(int64_t i) { fprintf(stdout, "%" PRId64, i); }
35 extern "C" void printU64(uint64_t u) { fprintf(stdout, "%" PRIu64, u); }
36 extern "C" void printF32(float f) { fprintf(stdout, "%g", f); }
37 extern "C" void printF64(double d) { fprintf(stdout, "%lg", d); }
38 extern "C" void printOpen() { fputs("( ", stdout); }
39 extern "C" void printClose() { fputs(" )", stdout); }
40 extern "C" void printComma() { fputs(", ", stdout); }
41 extern "C" void printNewline() { fputc('\n', stdout); }
42 
43 extern "C" MLIR_CRUNNERUTILS_EXPORT void
44 memrefCopy(int64_t elemSize, UnrankedMemRefType<char> *srcArg,
45            UnrankedMemRefType<char> *dstArg) {
46   DynamicMemRefType<char> src(*srcArg);
47   DynamicMemRefType<char> dst(*dstArg);
48 
49   int64_t rank = src.rank;
50   int64_t *indices = static_cast<int64_t *>(alloca(sizeof(int64_t) * rank));
51   int64_t *srcStrides = static_cast<int64_t *>(alloca(sizeof(int64_t) * rank));
52   int64_t *dstStrides = static_cast<int64_t *>(alloca(sizeof(int64_t) * rank));
53 
54   char *srcPtr = src.data + src.offset * elemSize;
55   char *dstPtr = dst.data + dst.offset * elemSize;
56 
57   // Initialize index and scale strides.
58   for (int rankp = 0; rankp < rank; ++rankp) {
59     indices[rankp] = 0;
60     srcStrides[rankp] = src.strides[rankp] * elemSize;
61     dstStrides[rankp] = dst.strides[rankp] * elemSize;
62   }
63 
64   int64_t readIndex = 0, writeIndex = 0;
65   for (;;) {
66     // Copy over the element, byte by byte.
67     memcpy(dstPtr + writeIndex, srcPtr + readIndex, elemSize);
68     // Advance index and read position.
69     for (int64_t axis = rank - 1; axis >= 0; --axis) {
70       // Advance at current axis.
71       auto newIndex = ++indices[axis];
72       readIndex += srcStrides[axis];
73       writeIndex += dstStrides[axis];
74       // If this is a valid index, we have our next index, so continue copying.
75       if (src.sizes[axis] != newIndex)
76         break;
77       // We reached the end of this axis. If this is axis 0, we are done.
78       if (axis == 0)
79         return;
80       // Else, reset to 0 and undo the advancement of the linear index that
81       // this axis had. The continue with the axis one outer.
82       indices[axis] = 0;
83       readIndex -= src.sizes[axis] * srcStrides[axis];
84       writeIndex -= dst.sizes[axis] * dstStrides[axis];
85     }
86   }
87 }
88 
89 /// Prints GFLOPS rating.
90 extern "C" void print_flops(double flops) {
91   fprintf(stderr, "%lf GFLOPS\n", flops / 1.0E9);
92 }
93 
94 /// Returns the number of seconds since Epoch 1970-01-01 00:00:00 +0000 (UTC).
95 extern "C" double rtclock() {
96 #ifndef _WIN32
97   struct timeval tp;
98   int stat = gettimeofday(&tp, NULL);
99   if (stat != 0)
100     fprintf(stderr, "Error returning time from gettimeofday: %d\n", stat);
101   return (tp.tv_sec + tp.tv_usec * 1.0e-6);
102 #else
103   fprintf(stderr, "Timing utility not implemented on Windows\n");
104   return 0.0;
105 #endif // _WIN32
106 }
107 
108 #endif // MLIR_CRUNNERUTILS_DEFINE_FUNCTIONS
109