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156d592abb
Thanks to Tiny Tiger and AIO for helping to point this out. One of the arguments was being overwritten before it was used, which caused an issue with the SSE2 codepath (while the SSE4.1 one was fine).
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
//
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// arch/x86_64/rsp/clamp.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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static inline __m128i rsp_sclamp_acc_tomd(
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__m128i acc_md, __m128i acc_hi) {
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__m128i l = _mm_unpacklo_epi16(acc_md, acc_hi);
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__m128i h = _mm_unpackhi_epi16(acc_md, acc_hi);
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return _mm_packs_epi32(l, h);
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}
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static inline __m128i rsp_uclamp_acc(__m128i val,
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__m128i acc_md, __m128i acc_hi, __m128i zero) {
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__m128i clamp_mask, clamped_val;
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__m128i hi_sign_check, md_sign_check;
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__m128i md_negative, hi_negative;
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hi_negative = _mm_srai_epi16(acc_hi, 15);
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md_negative = _mm_srai_epi16(acc_md, 15);
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// We don't have to clamp if the HI part of the
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// accumulator is sign-extended down to the MD part.
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hi_sign_check = _mm_cmpeq_epi16(hi_negative, acc_hi);
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md_sign_check = _mm_cmpeq_epi16(hi_negative, md_negative);
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clamp_mask = _mm_and_si128(md_sign_check, hi_sign_check);
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// Generate the value in the event we need to clamp.
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// * hi_negative, mid_sign => xxxx
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// * hi_negative, !mid_sign => 0000
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// * !hi_negative, mid_sign => FFFF
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// * !hi_negative, !mid_sign => xxxx
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clamped_val = _mm_cmpeq_epi16(hi_negative, zero);
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#ifndef __SSE4_1__
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md_sign_check = _mm_and_si128(clamp_mask, val);
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hi_sign_check = _mm_andnot_si128(clamp_mask, clamped_val);
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return _mm_or_si128(hi_sign_check, md_sign_check);
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#else
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return _mm_blendv_epi8(clamped_val, val, clamp_mask);
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#endif
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}
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