From 74a05a7f53878c70d10326d60d75e39fd93d944c Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Wed, 19 Mar 2014 06:54:04 +0100 Subject: pcm/Neon: explicit rounding Convert to 31 bit first, then right-shift with rounding to 16 bit. --- src/pcm/Neon.hxx | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'src/pcm/Neon.hxx') diff --git a/src/pcm/Neon.hxx b/src/pcm/Neon.hxx index ba31e55b8..7109778ab 100644 --- a/src/pcm/Neon.hxx +++ b/src/pcm/Neon.hxx @@ -76,11 +76,13 @@ struct NeonFloatTo16 { /* convert to 32 bit integer */ int32x4x4_t ivalue; neon_x4_b(vcvtq_n_s32_f32, ivalue, value, - DstTraits::BITS - 1); + 30); - /* convert to 16 bit integer with saturation */ + /* convert to 16 bit integer with saturation + and rounding */ int16x4x4_t nvalue; - neon_x4_u(vqmovn_s32, nvalue, ivalue); + neon_x4_b(vqrshrn_n_s32, nvalue, ivalue, + 30 - DstTraits::BITS + 1); /* store result */ vst4_s16(dst, nvalue); -- cgit v1.2.3