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添加函数 MathUtil::popcount，用于计算一个数字中二进制1的个数

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jinchao
2025-08-07 22:35:10 +08:00
parent 09eaa78ba1
commit dd72a8e3fd
3 changed files with 52 additions and 0 deletions
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test/unit/dvt_unit_math_util.cpp
+22
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@@ -76,4 +76,26 @@ TEST(MathUtil, Basic)
EXPECT_EQ_4X4_T_APPROX(m1, gm1, std::numeric_limits<float>::epsilon() * 100);
}
}
//couting bit set
{
EXPECT_EQ(MathUtil::popcount((uint8_t)(0x0)), 0);
EXPECT_EQ(MathUtil::popcount((uint8_t)(0xFF)), 8);
EXPECT_EQ(MathUtil::popcount((uint16_t)(0x0)), 0);
EXPECT_EQ(MathUtil::popcount((uint16_t)(0xFFFF)), 16);
EXPECT_EQ(MathUtil::popcount((uint32_t)(0x0)), 0);
EXPECT_EQ(MathUtil::popcount((uint32_t)(0xFFFFFFFF)), 32);
for(int32_t i=0; i<100; i++)
{
uint8_t v8 = (uint8_t)MathUtil::rangeRandom(0, 0xFF);
EXPECT_EQ(MathUtil::popcount(v8), __popcnt(v8));
uint16_t v16 = (uint16_t)MathUtil::rangeRandom(0, 0xFFFF);
EXPECT_EQ(MathUtil::popcount(v16), __popcnt(v16));
uint32_t v32 = (uint32_t)MathUtil::rangeRandom(0, 0x7FFFFF);
EXPECT_EQ(MathUtil::popcount(v32), __popcnt(v32));
}
}
}