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 2.5, “Intel® AVX and Intel® SSE Instruction Exception Classification,” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 2A, and Section 23.25.3, “Exception Conditions of Legacy SIMD Instructions Operating on MMX Registers,” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B.
Instruction Operand Encoding ¶
| Op/En | Tuple Type | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|---|
| A | N/A | ModRM:reg (r, w) | ModRM:r/m (r) | N/A | N/A |
| B | N/A | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | N/A |
| C | Full Mem | ModRM:reg (w) | EVEX.vvvv (r) | ModRM:r/m (r) | N/A |
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.
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 Table 2-21, “Type 4 Class Exception Conditions.”
EVEX-encoded instruction, see Exceptions Type E4.nb in Table 2-49, “Type E4 Class Exception Conditions.”