PMULHUW — Multiply Packed Unsigned Integers and Store High Result

Opcode/Instruction Op/En 64/32 bit Mode Support CPUID Feature Flag Description
NP 0F E4 /r1 PMULHUW mm1, mm2/m64 A V/V SSE Multiply the packed unsigned word integers in mm1 register and mm2/m64, and store the high 16 bits of the results in mm1.
66 0F E4 /r PMULHUW xmm1, xmm2/m128 A V/V SSE2 Multiply the packed unsigned word integers in xmm1 and xmm2/m128, and store the high 16 bits of the results in xmm1.
VEX.128.66.0F.WIG E4 /r VPMULHUW xmm1, xmm2, xmm3/m128 B V/V AVX Multiply the packed unsigned word integers in xmm2 and xmm3/m128, and store the high 16 bits of the results in xmm1.
VEX.256.66.0F.WIG E4 /r VPMULHUW ymm1, ymm2, ymm3/m256 B V/V AVX2 Multiply the packed unsigned word integers in ymm2 and ymm3/m256, and store the high 16 bits of the results in ymm1.
EVEX.128.66.0F.WIG E4 /r VPMULHUW xmm1 {k1}{z}, xmm2, xmm3/m128 C V/V AVX512VL AVX512BW Multiply the packed unsigned word integers in xmm2 and xmm3/m128, and store the high 16 bits of the results in xmm1 under writemask k1.
EVEX.256.66.0F.WIG E4 /r VPMULHUW ymm1 {k1}{z}, ymm2, ymm3/m256 C V/V AVX512VL AVX512BW Multiply the packed unsigned word integers in ymm2 and ymm3/m256, and store the high 16 bits of the results in ymm1 under writemask k1.
EVEX.512.66.0F.WIG E4 /r VPMULHUW zmm1 {k1}{z}, zmm2, zmm3/m512 C V/V AVX512BW Multiply the packed unsigned word integers in zmm2 and zmm3/m512, and store the high 16 bits of the results in zmm1 under writemask k1.

1. See note in Section 2.4, “AVX and SSE Instruction Exception Specification” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 2A and Section 22.25.3, “Exception Conditions of Legacy SIMD Instructions Operating on MMX Registers” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3A.

Instruction Operand Encoding

Op/En Tuple Type Operand 1 Operand 2 Operand 3 Operand 4
A NA ModRM:reg (r, w) ModRM:r/m (r) NA NA
B NA ModRM:reg (w) VEX.vvvv (r) ModRM:r/m (r) NA
C Full Mem ModRM:reg (w) EVEX.vvvv (r) ModRM:r/m (r) NA

Description

Performs a SIMD unsigned multiply of the packed unsigned word integers in the destination operand (first operand) and the source operand (second operand), and stores the high 16 bits of each 32-bit intermediate results in the destination operand. (Figure 4-12 shows this operation when using 64-bit operands.)

In 64-bit mode and not encoded with VEX/EVEX, using a REX prefix in the form of REX.R permits this instruction to access additional registers (XMM8-XMM15).

Legacy SSE version 64-bit operand: The source operand can be an MMX technology register or a 64-bit memory location. The destination operand is an MMX technology register.

128-bit Legacy SSE version: The first source and destination operands are XMM registers. The second source operand is an XMM register or a 128-bit memory location. Bits (MAXVL-1:128) of the corresponding YMM destination register remain unchanged.

VEX.128 encoded version: The first source and destination operands are XMM registers. The second source operand is an XMM register or a 128-bit memory location. Bits (MAXVL-1:128) of the destination YMM register are zeroed. VEX.L must be 0, otherwise the instruction will #UD.

VEX.256 encoded version: The second source operand can be an YMM register or a 256-bit memory location. The first source and destination operands are YMM registers.

EVEX encoded versions: The first source operand is a ZMM/YMM/XMM register. The second source operand can be a ZMM/YMM/XMM register, a 512/256/128-bit memory location. The destination operand is a ZMM/YMM/XMM register conditionally updated with writemask k1.

SRC X3 X2 X1 X0 DEST Y3 Y2 Y1 Y0 Z3 = X3 ∗ Y3 Z2 = X2 ∗ Y2 Z1 = X1 ∗ Y1 Z0 = X0 ∗ Y0 TEMP DEST Z3[31:16] Z2[31:16] Z1[31:16] Z0[31:16]
Figure 4-12. PMULHUW and PMULHW Instruction Operation Using 64-bit Operands

Operation

PMULHUW (with 64-bit operands)

TEMP0[31:0] ←
    DEST[15:0] ∗ SRC[15:0]; (* Unsigned multiplication *)
TEMP1[31:0] ←
    DEST[31:16] ∗ SRC[31:16];
TEMP2[31:0] ←
    DEST[47:32] ∗ SRC[47:32];
TEMP3[31:0] ←
    DEST[63:48] ∗ SRC[63:48];
DEST[15:0] ←
    TEMP0[31:16];
DEST[31:16] ←
    TEMP1[31:16];
DEST[47:32] ←
    TEMP2[31:16];
DEST[63:48] ←
    TEMP3[31:16];

PMULHUW (with 128-bit operands)

TEMP0[31:0] ←
    DEST[15:0] ∗ SRC[15:0]; (* Unsigned multiplication *)
TEMP1[31:0] ←
    DEST[31:16] ∗ SRC[31:16];
TEMP2[31:0] ←
    DEST[47:32] ∗ SRC[47:32];
TEMP3[31:0] ←
    DEST[63:48] ∗ SRC[63:48];
TEMP4[31:0] ←
    DEST[79:64] ∗ SRC[79:64];
TEMP5[31:0] ←
    DEST[95:80] ∗ SRC[95:80];
TEMP6[31:0] ←
    DEST[111:96] ∗ SRC[111:96];
TEMP7[31:0] ←
    DEST[127:112] ∗ SRC[127:112];
DEST[15:0] ←
    TEMP0[31:16];
DEST[31:16] ←
    TEMP1[31:16];
DEST[47:32] ←
    TEMP2[31:16];
DEST[63:48] ←
    TEMP3[31:16];
DEST[79:64] ←
    TEMP4[31:16];
DEST[95:80] ←
    TEMP5[31:16];
DEST[111:96] ←
    TEMP6[31:16];
DEST[127:112] ←
    TEMP7[31:16];

VPMULHUW (VEX.128 encoded version)

TEMP0[31:0]←SRC1[15:0] * SRC2[15:0]
TEMP1[31:0]←SRC1[31:16] * SRC2[31:16]
TEMP2[31:0]←SRC1[47:32] * SRC2[47:32]
TEMP3[31:0]←SRC1[63:48] * SRC2[63:48]
TEMP4[31:0]←SRC1[79:64] * SRC2[79:64]
TEMP5[31:0]←SRC1[95:80] * SRC2[95:80]
TEMP6[31:0]←SRC1[111:96] * SRC2[111:96]
TEMP7[31:0]←SRC1[127:112] * SRC2[127:112]
DEST[15:0] ← TEMP0[31:16]
DEST[31:16] ← TEMP1[31:16]
DEST[47:32] ← TEMP2[31:16]
DEST[63:48] ← TEMP3[31:16]
DEST[79:64] ← TEMP4[31:16]
DEST[95:80] ← TEMP5[31:16]
DEST[111:96] ← TEMP6[31:16]
DEST[127:112] ← TEMP7[31:16]
DEST[MAXVL-1:128] ← 0

PMULHUW (VEX.256 encoded version)

TEMP0[31:0]←SRC1[15:0] * SRC2[15:0]
TEMP1[31:0]←SRC1[31:16] * SRC2[31:16]
TEMP2[31:0]←SRC1[47:32] * SRC2[47:32]
TEMP3[31:0]←SRC1[63:48] * SRC2[63:48]
TEMP4[31:0]←SRC1[79:64] * SRC2[79:64]
TEMP5[31:0]←SRC1[95:80] * SRC2[95:80]
TEMP6[31:0]←SRC1[111:96] * SRC2[111:96]
TEMP7[31:0]←SRC1[127:112] * SRC2[127:112]
TEMP8[31:0]←SRC1[143:128] * SRC2[143:128]
TEMP9[31:0]←SRC1[159:144] * SRC2[159:144]
TEMP10[31:0]←SRC1[175:160] * SRC2[175:160]
TEMP11[31:0]←SRC1[191:176] * SRC2[191:176]
TEMP12[31:0]←SRC1[207:192] * SRC2[207:192]
TEMP13[31:0]←SRC1[223:208] * SRC2[223:208]
TEMP14[31:0]←SRC1[239:224] * SRC2[239:224]
TEMP15[31:0]←SRC1[255:240] * SRC2[255:240]
DEST[15:0] ← TEMP0[31:16]
DEST[31:16] ← TEMP1[31:16]
DEST[47:32] ← TEMP2[31:16]
DEST[63:48] ← TEMP3[31:16]
DEST[79:64] ← TEMP4[31:16]
DEST[95:80] ← TEMP5[31:16]
DEST[111:96] ← TEMP6[31:16]
DEST[127:112] ← TEMP7[31:16]
DEST[143:128] ← TEMP8[31:16]
DEST[159:144] ← TEMP9[31:16]
DEST[175:160] ← TEMP10[31:16]
DEST[191:176] ← TEMP11[31:16]
DEST[207:192] ← TEMP12[31:16]
DEST[223:208] ← TEMP13[31:16]
DEST[239:224] ← TEMP14[31:16]
DEST[255:240] ← TEMP15[31:16]
DEST[MAXVL-1:256] ← 0

PMULHUW (EVEX encoded versions)

(KL, VL) = (8, 128), (16, 256), (32, 512)
FOR j←0 TO KL-1
    i←j * 16
    IF k1[j] OR *no writemask*
        THEN
            temp[31:0]←SRC1[i+15:i] * SRC2[i+15:i]
            DEST[i+15:i] ← tmp[31:16]
        ELSE
            IF *merging-masking* ; merging-masking
                THEN *DEST[i+15:i] remains unchanged*
                ELSE *zeroing-masking*
                        ; zeroing-masking
                    DEST[i+15:i] ← 0
            FI
    FI;
ENDFOR
DEST[MAXVL-1:VL] ← 0

Intel C/C++ Compiler Intrinsic Equivalent

VPMULHUW __m512i _mm512_mulhi_epu16(__m512i a, __m512i b);

VPMULHUW __m512i _mm512_mask_mulhi_epu16(__m512i s, __mmask32 k, __m512i a, __m512i b);

VPMULHUW __m512i _mm512_maskz_mulhi_epu16( __mmask32 k, __m512i a, __m512i b);

VPMULHUW __m256i _mm256_mask_mulhi_epu16(__m256i s, __mmask16 k, __m256i a, __m256i b);

VPMULHUW __m256i _mm256_maskz_mulhi_epu16( __mmask16 k, __m256i a, __m256i b);

VPMULHUW __m128i _mm_mask_mulhi_epu16(__m128i s, __mmask8 k, __m128i a, __m128i b);

VPMULHUW __m128i _mm_maskz_mulhi_epu16( __mmask8 k, __m128i a, __m128i b);

PMULHUW:__m64 _mm_mulhi_pu16(__m64 a, __m64 b)

(V)PMULHUW:__m128i _mm_mulhi_epu16 ( __m128i a, __m128i b)

VPMULHUW:__m256i _mm256_mulhi_epu16 ( __m256i a, __m256i b)

Flags Affected

None.

Numeric Exceptions

None.

Other Exceptions

Non-EVEX-encoded instruction, see Exceptions Type 4.

EVEX-encoded instruction, see Exceptions Type E4.nb.