VPDPWSSDS

VPDPWSSDS — Multiply and Add Signed Word Integers with Saturation

Opcode/ Instruction	Op/ En	64/32 bit Mode Support	CPUID Feature Flag	Description
EVEX.128.66.0F38.W0 53 /r VPDPWSSDS xmm1{k1}{z}, xmm2, xmm3/m128/m32bcst	A	V/V	AVX512_VNNI AVX512VL	Multiply groups of 2 pairs of signed words in xmm3/m128/m32bcst with corresponding signed words of xmm2, summing those products and adding them to doubleword result in xmm1, with signed saturation, under writemask k1.
EVEX.256.66.0F38.W0 53 /r VPDPWSSDS ymm1{k1}{z}, ymm2, ymm3/m256/m32bcst	A	V/V	AVX512_VNNI AVX512VL	Multiply groups of 2 pairs of signed words in ymm3/m256/m32bcst with corresponding signed words of ymm2, summing those products and adding them to doubleword result in ymm1, with signed saturation, under writemask k1.
EVEX.512.66.0F38.W0 53 /r VPDPWSSDS zmm1{k1}{z}, zmm2, zmm3/m512/m32bcst	A	V/V	AVX512_VNNI	Multiply groups of 2 pairs of signed words in zmm3/m512/m32bcst with corresponding signed words of zmm2, summing those products and adding them to doubleword result in zmm1, with signed saturation, under writemask k1.

Instruction Operand Encoding

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

Description

Multiplies the individual signed words of the first source operand by the corresponding signed words of the second source operand, producing intermediate signed, doubleword results. The adjacent doubleword results are then summed and accumulated in the destination operand. If the intermediate sum overflows a 32b signed number, the result is saturated to either 0x7FFF_FFFF for positive numbers of 0x8000_0000 for negative numbers.

This instruction supports memory fault suppression.

Operation

VPDPWSSDS dest, src1, src2

(KL,VL)=(4,128), (8,256), (16,512)
ORIGDEST ← DEST
FOR i ← 0 TO KL-1:
    IF k1[i] or *no writemask*:
        IF SRC2 is memory and EVEX.b == 1:
            t ← SRC2.dword[0]
        ELSE:
            t ← SRC2.dword[i]
        p1dword ← SRC1.word[2*i] * t.word[0]
        p2dword ← SRC1.word[2*i+1] * t.word[1]
        DEST.dword[i] ← SIGNED_DWORD_SATURATE(ORIGDEST.dword[i] + p1dword + p2dword)
    ELSE IF *zeroing*:
        DEST.dword[i] ← 0
    ELSE: 
            // Merge masking, dest element unchanged
        DEST.dword[i] ← ORIGDEST.dword[i]
DEST[MAX_VL-1:VL] ← 0

Intel C/C++ Compiler Intrinsic Equivalent

VPDPWSSDS __m128i _mm_dpwssds_epi32(__m128i, __m128i, __m128i);
VPDPWSSDS __m128i _mm_mask_dpwssd_epi32(__m128i, __mmask8, __m128i, __m128i);
VPDPWSSDS __m128i _mm_maskz_dpwssd_epi32(__mmask8, __m128i, __m128i, __m128i);
VPDPWSSDS __m256i _mm256_dpwssd_epi32(__m256i, __m256i, __m256i);
VPDPWSSDS __m256i _mm256_mask_dpwssd_epi32(__m256i, __mmask8, __m256i, __m256i);
VPDPWSSDS __m256i _mm256_maskz_dpwssd_epi32(__mmask8, __m256i, __m256i, __m256i);
VPDPWSSDS __m512i _mm512_dpwssd_epi32(__m512i, __m512i, __m512i);
VPDPWSSDS __m512i _mm512_mask_dpwssd_epi32(__m512i, __mmask16, __m512i, __m512i);
VPDPWSSDS __m512i _mm512_maskz_dpwssd_epi32(__mmask16, __m512i, __m512i, __m512i);

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Exceptions Type E4.

---

Source: Intel® Architecture Instruction Set Extensions and Future Features Programming Reference (May 2019)
Generated: 28-5-2019