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25 lines
703 B
C
25 lines
703 B
C
//
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// arch/x86_64/rsp/vadd.h
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "common.h"
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static inline __m128i rsp_vadd(__m128i vs, __m128i vt,
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__m128i carry, __m128i *acc_lo) {
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__m128i vd, minimum, maximum;
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// VCC uses unsaturated arithmetic.
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vd = _mm_add_epi16(vs, vt);
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*acc_lo = _mm_sub_epi16(vd, carry);
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// VD is the signed sum of the two sources and the carry. Since we
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// have to saturate the sum of all three, we have to be clever.
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minimum = _mm_min_epi16(vs, vt);
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maximum = _mm_max_epi16(vs, vt);
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minimum = _mm_subs_epi16(minimum, carry);
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return _mm_adds_epi16(minimum, maximum);
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}
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