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Source code

PHADDW, PHADDD

Packed Horizontal Add

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
NP 0F 38 01 /r1PHADDW mm1, mm2/m64RMValidValidAdd 16-bit integers horizontally, pack to mm1.
66 0F 38 01 /rPHADDW xmm1, xmm2/m128RMValidValidAdd 16-bit integers horizontally, pack to xmm1.
NP 0F 38 02 /rPHADDD mm1, mm2/m64RMValidValidAdd 32-bit integers horizontally, pack to mm1.
66 0F 38 02 /rPHADDD xmm1, xmm2/m128RMValidValidAdd 32-bit integers horizontally, pack to xmm1.
VEX.128.66.0F38.WIG 01 /rVPHADDW xmm1, xmm2, xmm3/m128RVMValidValidAdd 16-bit integers horizontally, pack to xmm1.
VEX.128.66.0F38.WIG 02 /rVPHADDD xmm1, xmm2, xmm3/m128RVMValidValidAdd 32-bit integers horizontally, pack to xmm1.
VEX.256.66.0F38.WIG 01 /rVPHADDW ymm1, ymm2, ymm3/m256RVMValidValidAdd 16-bit signed integers horizontally, pack to ymm1.
VEX.256.66.0F38.WIG 02 /rVPHADDD ymm1, ymm2, ymm3/m256RVMValidValidAdd 32-bit signed integers horizontally, pack to ymm1.

Operand encoding

Each mode is a value of the Op/En column above. It says which field of the encoded instruction carries each operand, in the order they are written, and whether the instruction reads it, writes it or both.

RM

  1. modrm.reg lectura y escrituraModRM byte, reg field (bits 5-3)
  2. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

RVM

  1. modrm.reg escrituraModRM byte, reg field (bits 5-3)
  2. vex.vvvv lecturaVEX prefix, vvvv field (inverted)
  3. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

Measured cost

Loading measurements from arch-data...

Description

(V)PHADDW adds two adjacent 16-bit signed integers horizontally from the source and destination operands and packs the 16-bit signed results to the destination operand (first operand). (V)PHADDD adds two adjacent 32-bit signed integers horizontally from the source and destination operands and packs the 32-bit signed results to the destination operand (first 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.

Note that these instructions can operate on either unsigned or signed (two's complement notation) integers; however, it does not set bits in the EFLAGS register to indicate overflow and/or a carry. To prevent undetected overflow conditions, software must control the ranges of the values operated on.

Legacy SSE instructions: 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 can be 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 can be an XMM register or a 128-bit memory location. Bits (MAXVL-1:128) of the corresponding YMM register are zeroed. VEX.256 encoded version: Horizontal addition of two adjacent data elements of the low 16-bytes of the first and second source operands are packed into the low 16-bytes of the destination operand. Horizontal addition of two adjacent data elements of the high 16-bytes of the first and second source operands are packed into the high 16-bytes of the destination operand. The first source and destination operands are YMM registers. The second source operand can be an YMM register or a 256-bit memory location.

SRC2 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 X7 X6 X5 X4 X3 X2 X1 X0 SRC1

S7 S3 S3 S4 S3 S2 S1 S0

            255              0

Dest

Figure 4-10. 256-bit VPHADDD Instruction Operation

Operation

PHADDW (With 64-bit Operands)
    mm1[15-0] = mm1[31-16] + mm1[15-0];
    mm1[31-16] = mm1[63-48] + mm1[47-32];
    mm1[47-32] = mm2/m64[31-16] + mm2/m64[15-0];
    mm1[63-48] = mm2/m64[63-48] + mm2/m64[47-32];

PHADDW (With 128-bit Operands)
    xmm1[15-0] = xmm1[31-16] + xmm1[15-0];
    xmm1[31-16] = xmm1[63-48] + xmm1[47-32];
    xmm1[47-32] = xmm1[95-80] + xmm1[79-64];
    xmm1[63-48] = xmm1[127-112] + xmm1[111-96];
    xmm1[79-64] = xmm2/m128[31-16] + xmm2/m128[15-0];
    xmm1[95-80] = xmm2/m128[63-48] + xmm2/m128[47-32];
    xmm1[111-96] = xmm2/m128[95-80] + xmm2/m128[79-64];
    xmm1[127-112] = xmm2/m128[127-112] + xmm2/m128[111-96];

VPHADDW (VEX.128 Encoded Version)
DEST[15:0] := SRC1[31:16] + SRC1[15:0]
DEST[31:16] := SRC1[63:48] + SRC1[47:32]
DEST[47:32] := SRC1[95:80] + SRC1[79:64]
DEST[63:48] := SRC1[127:112] + SRC1[111:96]
DEST[79:64] := SRC2[31:16] + SRC2[15:0]
DEST[95:80] := SRC2[63:48] + SRC2[47:32]
DEST[111:96] := SRC2[95:80] + SRC2[79:64]
DEST[127:112] := SRC2[127:112] + SRC2[111:96]
DEST[MAXVL-1:128] := 0


VPHADDW (VEX.256 Encoded Version)
DEST[15:0] := SRC1[31:16] + SRC1[15:0]
DEST[31:16] := SRC1[63:48] + SRC1[47:32]
DEST[47:32] := SRC1[95:80] + SRC1[79:64]
DEST[63:48] := SRC1[127:112] + SRC1[111:96]
DEST[79:64] := SRC2[31:16] + SRC2[15:0]
DEST[95:80] := SRC2[63:48] + SRC2[47:32]
DEST[111:96] := SRC2[95:80] + SRC2[79:64]
DEST[127:112] := SRC2[127:112] + SRC2[111:96]
DEST[143:128] := SRC1[159:144] + SRC1[143:128]
DEST[159:144] := SRC1[191:176] + SRC1[175:160]
DEST[175:160] := SRC1[223:208] + SRC1[207:192]
DEST[191:176] := SRC1[255:240] + SRC1[239:224]
DEST[207:192] := SRC2[127:112] + SRC2[143:128]
DEST[223:208] := SRC2[159:144] + SRC2[175:160]
DEST[239:224] := SRC2[191:176] + SRC2[207:192]
DEST[255:240] := SRC2[223:208] + SRC2[239:224]

PHADDD (With 64-bit Operands)
    mm1[31-0] = mm1[63-32] + mm1[31-0];
    mm1[63-32] = mm2/m64[63-32] + mm2/m64[31-0];

PHADDD (With 128-bit Operands)
    xmm1[31-0] = xmm1[63-32] + xmm1[31-0];
    xmm1[63-32] = xmm1[127-96] + xmm1[95-64];
    xmm1[95-64] = xmm2/m128[63-32] + xmm2/m128[31-0];
    xmm1[127-96] = xmm2/m128[127-96] + xmm2/m128[95-64];

VPHADDD (VEX.128 Encoded Version)
DEST[31-0] := SRC1[63-32] + SRC1[31-0]
DEST[63-32] := SRC1[127-96] + SRC1[95-64]
DEST[95-64] := SRC2[63-32] + SRC2[31-0]
DEST[127-96] := SRC2[127-96] + SRC2[95-64]
DEST[MAXVL-1:128] := 0

VPHADDD (VEX.256 Encoded Version)
DEST[31-0] := SRC1[63-32] + SRC1[31-0]
DEST[63-32] := SRC1[127-96] + SRC1[95-64]
DEST[95-64] := SRC2[63-32] + SRC2[31-0]
DEST[127-96] := SRC2[127-96] + SRC2[95-64]
DEST[159-128] := SRC1[191-160] + SRC1[159-128]
DEST[191-160] := SRC1[255-224] + SRC1[223-192]
DEST[223-192] := SRC2[191-160] + SRC2[159-128]
DEST[255-224] := SRC2[255-224] + SRC2[223-192]

Intel C/C++ compiler intrinsics

PHADDW __m64 _mm_hadd_pi16 (__m64 a, __m64 b) PHADDD __m64 _mm_hadd_pi32 (__m64 a, __m64 b) (V)PHADDW __m128i _mm_hadd_epi16 (__m128i a, __m128i b) (V)PHADDD __m128i _mm_hadd_epi32 (__m128i a, __m128i b) VPHADDW __m256i _mm256_hadd_epi16 (__m256i a, __m256i b) VPHADDD __m256i _mm256_hadd_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.

Sources