[llvm] [Docs] Add more vector examples (PR #131887)

[via llvm-commits]

https://github.com/john-stuart2 created https://github.com/llvm/llvm-project/pull/131887

The order of parameters is derived from GenericOpcodes.td. I wanted to keep the examples separate from the fix.

>From 2087b6e637eb15ba42cdcac675167fdf9bb4e1c6 Mon Sep 17 00:00:00 2001
From: John Stuart <john.stuart.science at gmail.com>
Date: Tue, 18 Mar 2025 19:52:31 +0100
Subject: [PATCH] [Docs] Add more vector examples

The order of parameters is derived from GenericOpcodes.td. I wanted to
keep the examples separate from the fix.
---
 llvm/docs/GlobalISel/GenericOpcode.rst | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/llvm/docs/GlobalISel/GenericOpcode.rst b/llvm/docs/GlobalISel/GenericOpcode.rst
index c5aa437f40bf1..5291b42d80870 100644
--- a/llvm/docs/GlobalISel/GenericOpcode.rst
+++ b/llvm/docs/GlobalISel/GenericOpcode.rst
@@ -743,16 +743,34 @@ same as all source operands)
 The _TRUNC version truncates the larger operand types to fit the
 destination vector elt type.
 
+.. code-block:: none
+
+  %4:_(<4 x i32>) = G_BUILD_VECTOR %0:_(i32), %1:_(i32), %2:_(i32), %3:_(i32)
+
+  %4:_(<4 x i32>) = G_BUILD_VECTOR_TRUNC %0:_(i64), %1:_(i64), %2:_(i64), %3:_(i64)
+
+
 G_INSERT_VECTOR_ELT
 ^^^^^^^^^^^^^^^^^^^
 
 Insert an element into a vector
 
+.. code-block:: none
+
+  %4:_(<16 x i32>) = G_INSERT_VECTOR_ELT %vec:_(<16 x i32>), %elt:_(i32), %idx:_(s64)
+
+
+
 G_EXTRACT_VECTOR_ELT
 ^^^^^^^^^^^^^^^^^^^^
 
 Extract an element from a vector
 
+.. code-block:: none
+
+  %elt:_(i32) = G_EXTRACT_VECTOR_ELT %vec:_(<16 x i32>), %idx:_(s64)
+
+
 G_SHUFFLE_VECTOR
 ^^^^^^^^^^^^^^^^