PHSUBW/PHSUBD — Packed Horizontal Subtract
| Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
|---|---|---|---|---|
| NP 0F 38 05 /r1 PHSUBW mm1, mm2/m64 | RM | V/V | SSSE3 | Subtract 16-bit signed integers horizontally, pack to mm1. |
| 66 0F 38 05 /r PHSUBW xmm1, xmm2/m128 | RM | V/V | SSSE3 | Subtract 16-bit signed integers horizontally, pack to xmm1. |
| NP 0F 38 06 /r PHSUBD mm1, mm2/m64 | RM | V/V | SSSE3 | Subtract 32-bit signed integers horizontally, pack to mm1. |
| 66 0F 38 06 /r PHSUBD xmm1, xmm2/m128 | RM | V/V | SSSE3 | Subtract 32-bit signed integers horizontally, pack to xmm1. |
| VEX.128.66.0F38.WIG 05 /r VPHSUBW xmm1, xmm2, xmm3/m128 | RVM | V/V | AVX | Subtract 16-bit signed integers horizontally, pack to xmm1. |
| VEX.128.66.0F38.WIG 06 /r VPHSUBD xmm1, xmm2, xmm3/m128 | RVM | V/V | AVX | Subtract 32-bit signed integers horizontally, pack to xmm1. |
| VEX.256.66.0F38.WIG 05 /r VPHSUBW ymm1, ymm2, ymm3/m256 | RVM | V/V | AVX2 | Subtract 16-bit signed integers horizontally, pack to ymm1. |
| VEX.256.66.0F38.WIG 06 /r VPHSUBD ymm1, ymm2, ymm3/m256 | RVM | V/V | AVX2 | Subtract 32-bit signed integers horizontally, pack to ymm1. |
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 | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
| RM | ModRM:reg (r, w) | ModRM:r/m (r) | N/A | N/A |
| RVM | ModRM:reg (r, w) | VEX.vvvv (r) | ModRM:r/m (r) | N/A |
Description ¶
(V)PHSUBW performs horizontal subtraction on each adjacent pair of 16-bit signed integers by subtracting the most significant word from the least significant word of each pair in the source and destination operands, and packs the signed 16-bit results to the destination operand (first operand). (V)PHSUBD performs horizontal subtraction on each adjacent pair of 32-bit signed integers by subtracting the most significant doubleword from the least significant doubleword of each pair, and packs the signed 32-bit result to the destination operand. When the source operand is a 128-bit memory operand, the operand must be aligned on a 16-byte boundary or a general-protection exception (#GP) will be generated.
Legacy SSE version: Both operands can be MMX registers. The second source operand can be an MMX register or a 64-bit memory location.
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.
In 64-bit mode, use the REX prefix to access additional registers.
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.256 encoded version: The first source and destination operands are YMM registers. The second source operand can be an YMM register or a 256-bit memory location.
Operation ¶
PHSUBW (With 64-bit Operands) ¶
mm1[15-0] = mm1[15-0] - mm1[31-16]; mm1[31-16] = mm1[47-32] - mm1[63-48]; mm1[47-32] = mm2/m64[15-0] - mm2/m64[31-16]; mm1[63-48] = mm2/m64[47-32] - mm2/m64[63-48];
PHSUBW (With 128-bit Operands) ¶
xmm1[15-0] = xmm1[15-0] - xmm1[31-16]; xmm1[31-16] = xmm1[47-32] - xmm1[63-48]; xmm1[47-32] = xmm1[79-64] - xmm1[95-80]; xmm1[63-48] = xmm1[111-96] - xmm1[127-112]; xmm1[79-64] = xmm2/m128[15-0] - xmm2/m128[31-16]; xmm1[95-80] = xmm2/m128[47-32] - xmm2/m128[63-48]; xmm1[111-96] = xmm2/m128[79-64] - xmm2/m128[95-80]; xmm1[127-112] = xmm2/m128[111-96] - xmm2/m128[127-112];
VPHSUBW (VEX.128 Encoded Version) ¶
DEST[15:0] := SRC1[15:0] - SRC1[31:16] DEST[31:16] := SRC1[47:32] - SRC1[63:48] DEST[47:32] := SRC1[79:64] - SRC1[95:80] DEST[63:48] := SRC1[111:96] - SRC1[127:112] DEST[79:64] := SRC2[15:0] - SRC2[31:16] DEST[95:80] := SRC2[47:32] - SRC2[63:48] DEST[111:96] := SRC2[79:64] - SRC2[95:80] DEST[127:112] := SRC2[111:96] - SRC2[127:112] DEST[MAXVL-1:128] := 0
VPHSUBW (VEX.256 Encoded Version) ¶
DEST[15:0] := SRC1[15:0] - SRC1[31:16] DEST[31:16] := SRC1[47:32] - SRC1[63:48] DEST[47:32] := SRC1[79:64] - SRC1[95:80] DEST[63:48] := SRC1[111:96] - SRC1[127:112] DEST[79:64] := SRC2[15:0] - SRC2[31:16] DEST[95:80] := SRC2[47:32] - SRC2[63:48] DEST[111:96] := SRC2[79:64] - SRC2[95:80] DEST[127:112] := SRC2[111:96] - SRC2[127:112] DEST[143:128] := SRC1[143:128] - SRC1[159:144] DEST[159:144] := SRC1[175:160] - SRC1[191:176] DEST[175:160] := SRC1[207:192] - SRC1[223:208] DEST[191:176] := SRC1[239:224] - SRC1[255:240] DEST[207:192] := SRC2[143:128] - SRC2[159:144] DEST[223:208] := SRC2[175:160] - SRC2[191:176] DEST[239:224] := SRC2[207:192] - SRC2[223:208] DEST[255:240] := SRC2[239:224] - SRC2[255:240]
PHSUBD (With 64-bit Operands) ¶
mm1[31-0] = mm1[31-0] - mm1[63-32]; mm1[63-32] = mm2/m64[31-0] - mm2/m64[63-32];
PHSUBD (With 128-bit Operands) ¶
xmm1[31-0] = xmm1[31-0] - xmm1[63-32]; xmm1[63-32] = xmm1[95-64] - xmm1[127-96]; xmm1[95-64] = xmm2/m128[31-0] - xmm2/m128[63-32]; xmm1[127-96] = xmm2/m128[95-64] - xmm2/m128[127-96];
VPHSUBD (VEX.128 Encoded Version) ¶
DEST[31-0] := SRC1[31-0] - SRC1[63-32] DEST[63-32] := SRC1[95-64] - SRC1[127-96] DEST[95-64] := SRC2[31-0] - SRC2[63-32] DEST[127-96] := SRC2[95-64] - SRC2[127-96] DEST[MAXVL-1:128] := 0
VPHSUBD (VEX.256 Encoded Version) ¶
DEST[31:0] := SRC1[31:0] - SRC1[63:32] DEST[63:32] := SRC1[95:64] - SRC1[127:96] DEST[95:64] := SRC2[31:0] - SRC2[63:32] DEST[127:96] := SRC2[95:64] - SRC2[127:96] DEST[159:128] := SRC1[159:128] - SRC1[191:160] DEST[191:160] := SRC1[223:192] - SRC1[255:224] DEST[223:192] := SRC2[159:128] - SRC2[191:160] DEST[255:224] := SRC2[223:192] - SRC2[255:224]
Intel C/C++ Compiler Intrinsic Equivalents ¶
PHSUBW __m64 _mm_hsub_pi16 (__m64 a, __m64 b)
PHSUBD __m64 _mm_hsub_pi32 (__m64 a, __m64 b)
(V)PHSUBW __m128i _mm_hsub_epi16 (__m128i a, __m128i b)
(V)PHSUBD __m128i _mm_hsub_epi32 (__m128i a, __m128i b)
VPHSUBW __m256i _mm256_hsub_epi16 (__m256i a, __m256i b)
VPHSUBD __m256i _mm256_hsub_epi32 (__m256i a, __m256i b)
SIMD Floating-Point Exceptions ¶
None.
Other Exceptions ¶
See Table 2-21, “Type 4 Class Exception Conditions,” additionally:
| #UD | If VEX.L = 1. |