test_mulhi_i32_4()

bool autoresearch::simd_check::test_mulhi_i32_4 ( )

inline

Definition at line 495 of file AutoResearchSimd.h.

                               {
    // mulhi_i32_4: ((i64)a * (i64)b) >> 16
    // Test: 0x00010000 * 0x00020000 >> 16 = 0x00020000 (1.0 * 2.0 = 2.0 in Q16.16)
    uint32_t a[4] = {0x00010000, 0x00020000, as_u32(-0x00010000), 0x00008000};
    uint32_t b[4] = {0x00020000, 0x00010000, 0x00020000, 0x00008000};
    uint32_t output[4] = {0};
    store_u32_4(output, mulhi_i32_4(load_u32_4(a), load_u32_4(b)));
    if (output[0] != 0x00020000) return false;  // 1.0 * 2.0 = 2.0
    if (output[1] != 0x00020000) return false;  // 2.0 * 1.0 = 2.0
    if (as_i32(output[2]) != -0x00020000) return false;  // -1.0 * 2.0 = -2.0
    if (output[3] != 0x00004000) return false;  // 0.5 * 0.5 = 0.25
    return true;
}

References as_i32(), and as_u32().

Referenced by getTests().

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