From 19721bb1c4de4622acea4bab4481c6f95f0f10ff Mon Sep 17 00:00:00 2001
From: Ethan Hardy <102838865+hardy-ethan@users.noreply.github.com>
Date: Mon, 22 Dec 2025 20:20:18 -0500
Subject: [PATCH] Fix #8349: Add `const` to Max Array C/C++ examples where
 applicable. (#8350)

As noted by Matt during his [Advent of Compiler Optimizations - Episode
20: Vectorization
[0:55]](https://www.youtube.com/watch?v=d68x8TF7XJs&t=55s), `const` can
and should be introduced here.

We don't need the elements of `y` to be modifiable.

Closes #8349

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---
 examples/c++/Max_array.cpp             | 2 +-
 examples/c++/Max_array_(Optimized).cpp | 2 +-
 examples/c/Max_array.c                 | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/c++/Max_array.cpp b/examples/c++/Max_array.cpp
index bc2ef8799..45ea1c6a6 100644
--- a/examples/c++/Max_array.cpp
+++ b/examples/c++/Max_array.cpp
@@ -1,4 +1,4 @@
-void maxArray(double* x, double* y) {
+void maxArray(double* x, const double* y) {
     for (int i = 0; i < 65536; i++) {
         if (y[i] > x[i]) x[i] = y[i];
     }
diff --git a/examples/c++/Max_array_(Optimized).cpp b/examples/c++/Max_array_(Optimized).cpp
index a6256e93f..aa7dfde1b 100644
--- a/examples/c++/Max_array_(Optimized).cpp
+++ b/examples/c++/Max_array_(Optimized).cpp
@@ -1,7 +1,7 @@
 // Compile with -O3 -march=native to see autovectorization
 typedef double *__attribute__((aligned(64))) aligned_double;
 
-void maxArray(aligned_double __restrict x, aligned_double __restrict y) {
+void maxArray(aligned_double __restrict x, const aligned_double __restrict y) {
     for (int i = 0; i < 65536; i++) {
         x[i] = ((y[i] > x[i]) ? y[i] : x[i]);
     }
diff --git a/examples/c/Max_array.c b/examples/c/Max_array.c
index c1ab7c15b..e485502c3 100644
--- a/examples/c/Max_array.c
+++ b/examples/c/Max_array.c
@@ -1,4 +1,4 @@
-void maxArray(double* x, double* y) {
+void maxArray(double* x, const double* y) {
     int i;
 
     for (i = 0; i < 65536; i++) {