From 16a55143dcd5f7a11fed8fbb9507920362bfed3d Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Thu, 3 May 2018 14:40:39 -0400
Subject: [PATCH] tcg: Document INDEX_mul[us]h_*

Backports commit d103021269ca9307ed7ca0d845d2b9e6c387509a from qemu
---
 qemu/tcg/README | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/qemu/tcg/README b/qemu/tcg/README
index 0f9a25f1..ff3f231c 100644
--- a/qemu/tcg/README
+++ b/qemu/tcg/README
@@ -426,6 +426,14 @@ double-word product T0.  The later is returned in two single-word outputs.
 
 Similar to mulu2, except the two inputs T1 and T2 are signed.
 
+* mulsh_i32/i64 t0, t1, t2
+* muluh_i32/i64 t0, t1, t2
+
+Provide the high part of a signed or unsigned multiply, respectively.
+If mulu2/muls2 are not provided by the backend, the tcg-op generator
+can obtain the same results can be obtained by emitting a pair of
+opcodes, mul+muluh/mulsh.
+
 ********* Memory Barrier support
 
 * mb <$arg>