From: lkcl <lkcl@web>
Date: Thu, 3 Oct 2019 13:36:02 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~3915
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a28a81a155c4e45c6356de3fc3989bb9812ef34c;p=libreriscv.git

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diff --git a/simple_v_extension/specification/ld.x.mdwn b/simple_v_extension/specification/ld.x.mdwn
new file mode 100644
index 000000000..5ca7683a9
--- /dev/null
+++ b/simple_v_extension/specification/ld.x.mdwn
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+# LD.X and LD.Swizzle
+
+See <http://bugs.libre-riscv.org/show_bug.cgi?id=139>
+
+SV is based on vectorisation of scalar opcodes. LD and ST from scalar RISCV can be extended by either rd or rs1 being vectorised, however a third "immediate element strided" multiples do not fit.
+
+In addition, Vulkan requires swizzled LD/ST covering:
+
+* constant 0, 1
+* min/max int/uint
+* 1.0 and
+* x, y, z, or w.
+