From 6f3a1bfabc2dea0c6aa6417dfbf142632a8250a5 Mon Sep 17 00:00:00 2001
From: Jiajie Chen <c@jia.je>
Date: Tue, 12 Dec 2023 15:30:17 +0800
Subject: [PATCH] Add vbitseli.b

---
 README.md                   |  2 --
 code/vbitseli_b.cpp         | 15 +++++++++++++++
 code/vbitseli_b.h           |  3 +++
 docs/lsx_bitops/vbitwise.md | 21 +++++++++++++++++++++
 4 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 code/vbitseli_b.cpp
 create mode 100644 code/vbitseli_b.h

diff --git a/README.md b/README.md
index 799de94a..5c7a3f54 100644
--- a/README.md
+++ b/README.md
@@ -390,8 +390,6 @@ Vector Multiplication High
 
 ### vshuf4i.b/h/w/d
 
-### vbitseli.b
-
 ### vori.b
 
 ### vxori.b
diff --git a/code/vbitseli_b.cpp b/code/vbitseli_b.cpp
new file mode 100644
index 00000000..9a70ef57
--- /dev/null
+++ b/code/vbitseli_b.cpp
@@ -0,0 +1,15 @@
+#include "common.h"
+
+v128 vbitseli_b(v128 a, v128 b, int imm) {
+  v128 dst;
+#include "vbitseli_b.h"
+  return dst;
+}
+
+void test() {
+	FUZZ2(vbitseli_b, 0x00);
+	FUZZ2(vbitseli_b, 0x01);
+	FUZZ2(vbitseli_b, 0x01);
+	FUZZ2(vbitseli_b, 0x80);
+	FUZZ2(vbitseli_b, 0xFF);
+	}
diff --git a/code/vbitseli_b.h b/code/vbitseli_b.h
new file mode 100644
index 00000000..535352c5
--- /dev/null
+++ b/code/vbitseli_b.h
@@ -0,0 +1,3 @@
+for (int i = 0; i < 16; i++) {
+  dst.byte[i] = (~a.byte[i] & b.byte[i]) | (a.byte[i] & (u8)imm);
+}
\ No newline at end of file
diff --git a/docs/lsx_bitops/vbitwise.md b/docs/lsx_bitops/vbitwise.md
index ad1a5dc1..cf3496b6 100644
--- a/docs/lsx_bitops/vbitwise.md
+++ b/docs/lsx_bitops/vbitwise.md
@@ -21,6 +21,27 @@ Compute bitwise selection: for each bit position, if the bit in `c` equals to on
 {% include 'vbitsel_v.h' %}
 ```
 
+## __m128i __lsx_vbitseli_b (__m128i a, __m128i b, imm0_255 imm)
+
+### Synopsis
+
+```c++
+__m128i __lsx_vbitseli_b (__m128i a, __m128i b, imm0_255 imm)
+#include <lsxintrin.h>
+Instruction: vbitseli.b vr, vr, imm
+CPU Flags: LSX
+```
+
+### Description
+
+Compute bitwise selection: for each bit position, if the bit in `a` equals to one, copy the bit from `imm` to `dst`, otherwise copy from `b`.
+
+### Operation
+
+```c++
+{% include 'vbitseli_b.h' %}
+```
+
 {{ vbitclr('b') }}
 {{ vbitclr('h') }}
 {{ vbitclr('w') }}