From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 18 Sep 2019 05:32:38 +0000 (+0100)
Subject: add shuffle TODO analyse later
X-Git-Tag: convert-csv-opcode-to-binary~4036
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=dd9a5b28b1464d4e67e1daadef4e0e24d534934b;p=libreriscv.git

add shuffle TODO analyse later
---

diff --git a/simple_v_extension/specification/mv.x.rst b/simple_v_extension/specification/mv.x.rst
index 1c81b7ca2..078e5fe23 100644
--- a/simple_v_extension/specification/mv.x.rst
+++ b/simple_v_extension/specification/mv.x.rst
@@ -57,3 +57,17 @@ VBLOCK context?
 
 additional idea: a VBLOCK context that says that if a given register is used, it indicates that the
 register is to be "swizzled", and the VBLOCK swizzle context contains the swizzling to be carried out.
+
+mm_shuffle_ps?
+==============
+
+__m128 _mm_shuffle_ps(__m128 lo,__m128 hi,
+       _MM_SHUFFLE(hi3,hi2,lo1,lo0))
+Interleave inputs into low 2 floats and high 2 floats of output. Basically
+   out[0]=lo[lo0];
+   out[1]=lo[lo1];
+   out[2]=hi[hi2];
+   out[3]=hi[hi3];
+
+For example, _mm_shuffle_ps(a,a,_MM_SHUFFLE(i,i,i,i)) copies the float
+a[i] into all 4 output floats.