From e479180282405fb1cdad03a7e97c2bf713965bac Mon Sep 17 00:00:00 2001
From: MITSUNARI Shigeo <herumi@nifty.com>
Date: Thu, 11 Jan 2024 08:32:16 +0900
Subject: [PATCH] [doc] update usage

---
 doc/usage.md | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/doc/usage.md b/doc/usage.md
index e9db358..f65148b 100644
--- a/doc/usage.md
+++ b/doc/usage.md
@@ -10,8 +10,8 @@ using namespace Xbyak_riscv;
 struct Code : CodeGenerator {
   Code(int v)
   {
-    add(a0, a0, a1);
-    addi(a0, a0, v);
+    addw(a0, a0, a1);
+    addiw(a0, a0, v);
     ret();
   }
 };
@@ -53,6 +53,21 @@ x28-31|t3-6
 
 These names are defined in the `Xbyak_riscv` namespace.
 
+# Syntax
+
+asm|Xbyak
+-|-
+`add x3, x4, x5`|`add(x3, x4, x5);`
+`ld x3, 16(x4)`|`ld(x3, x4, 16);`
+`sw t0,8(s1)`|sw(t0, s1, 8);`
+`amoswap.w a0,a1,(a2)`|amoswap_w(a0, a1, a2);`
+
+Replace a period in instructions with an underscore.
+
+# RVC
+
+Use `supportRVC()` to enable RVC instructions.
+
 # Macros
 
 - Define `XBYAK_RISCV_V = 1` to enable Vector Operations.