VSCALEFPD - SCALE Floating-point Packed Double

VSCALEFPD xmm1{k1}{z}, xmm2, xmm3/m128/m64bcst    (V5+VL
__m128d _mm_scalef_pd(__m128d a, __m128d b)
__m128d _mm_mask_scalef_pd(__m128d s, __mmask8 k, __m128d a, __m128d b)
__m128d _mm_maskz_scalef_pd(__mmask8 k, __m128d a, __m128d b)

For each double, calculate (1) * 2n, where n is an integer value of (2) truncated toward negative infinity, and set the result to (3).
VSCALEFPD ymm1{k1}{z}, ymm2, ymm3/m256/m64bcst    (V5+VL
__m256d _mm256_scalef_pd(__m256d a, __m256d b)
__m256d _mm256_mask_scalef_pd(__m256d s, __mmask8 k, __m256d a, __m256d b)
__m256d _mm256_maskz_scalef_pd(__mmask8 k, __m256d a, __m256d b)

For each double, calculate (1) * 2n, where n is an integer value of (2) truncated toward negative infinity, and set the result to (3).
VSCALEFPD zmm1{k1}{z}, zmm2, zmm3/m512/m64bcst{er}    (V5
__m512d _mm512_scalef_pd(__m512d a, __m512d b)
__m512d _mm512_mask_scalef_pd(__m512d s, __mmask8 k, __m512d a, __m512d b)
__m512d _mm512_maskz_scalef_pd(__mmask8 k, __m512d a, __m512d b)
__m512d _mm512_scalef_round_pd(__m512d a, __m512d b, int r)
__m512d _mm512_mask_scalef_round_pd(__m512d s, __mmask8 k, __m512d a, __m512d b, int r)
__m512d _mm512_maskz_scalef_round_pd(__mmask8 k, __m512d a, __m512d b, int r)

For each double, calculate (1) * 2n, where n is an integer value of (2) truncated toward negative infinity, and set the result to (3).
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