SPIRV-Tools/test/OpcodeMake.cpp

// Copyright (c) 2015-2016 The Khronos Group Inc.
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#include "UnitSPIRV.h"

namespace {

// A sampling of word counts.  Covers extreme points well, and all bit
// positions, and some combinations of bit positions.
const uint16_t kSampleWordCounts[] = {
    0,   1,   2,   3,    4,    8,    16,   32,    64,    127,    128,
    256, 511, 512, 1024, 2048, 4096, 8192, 16384, 32768, 0xfffe, 0xffff};

// A sampling of opcode values.  Covers the lower values well, a few samples
// around the number of core instructions (as of this writing), and some
// higher values.
const uint16_t kSampleOpcodes[] = {0,   1,   2,    3,      4,     100,
                                   300, 305, 1023, 0xfffe, 0xffff};

TEST(OpcodeMake, Samples) {
  for (auto wordCount : kSampleWordCounts) {
    for (auto opcode : kSampleOpcodes) {
      uint32_t word = 0;
      word |= uint32_t(opcode);
      word |= uint32_t(wordCount) << 16;
      EXPECT_EQ(word, spvOpcodeMake(wordCount, SpvOp(opcode)));
    }
  }
}

}  // anonymous namespace