diff --git a/04/4_simd/07_vectorize_0_to_n_mod4/.vim_localrc b/04/4_simd/07_vectorize_0_to_n_mod4/.vim_localrc
new file mode 100644
index 00000000..55210bf4
--- /dev/null
+++ b/04/4_simd/07_vectorize_0_to_n_mod4/.vim_localrc
@@ -0,0 +1,2 @@
+" vim: ft=vim
+nnoremap <silent> <F7> :wa<CR>:!make\|\|(echo -n .;read -n1)<CR><CR>
diff --git a/04/4_simd/07_vectorize_0_to_n_mod4/main.cpp b/04/4_simd/07_vectorize_0_to_n_mod4/main.cpp
new file mode 100644
index 00000000..963552f3
--- /dev/null
+++ b/04/4_simd/07_vectorize_0_to_n_mod4/main.cpp
@@ -0,0 +1,6 @@
+void func(int *a, int n) {
+    n = n / 4 * 4;
+    for (int i = 0; i < n; i++) {
+        a[i] = i;
+    }
+}
diff --git a/04/4_simd/07_vectorize_0_to_n_mod4/run.sh b/04/4_simd/07_vectorize_0_to_n_mod4/run.sh
new file mode 100755
index 00000000..3553d279
--- /dev/null
+++ b/04/4_simd/07_vectorize_0_to_n_mod4/run.sh
@@ -0,0 +1,4 @@
+set -e
+
+gcc -O3 -fomit-frame-pointer -fverbose-asm -S main.cpp -o /tmp/main.S
+vim /tmp/main.S
diff --git a/04/4_simd/08_vectorize_0_to_n_mod4_aligned/.vim_localrc b/04/4_simd/08_vectorize_0_to_n_mod4_aligned/.vim_localrc
new file mode 100644
index 00000000..55210bf4
--- /dev/null
+++ b/04/4_simd/08_vectorize_0_to_n_mod4_aligned/.vim_localrc
@@ -0,0 +1,2 @@
+" vim: ft=vim
+nnoremap <silent> <F7> :wa<CR>:!make\|\|(echo -n .;read -n1)<CR><CR>
diff --git a/04/4_simd/08_vectorize_0_to_n_mod4_aligned/main.cpp b/04/4_simd/08_vectorize_0_to_n_mod4_aligned/main.cpp
new file mode 100644
index 00000000..6af2f0ff
--- /dev/null
+++ b/04/4_simd/08_vectorize_0_to_n_mod4_aligned/main.cpp
@@ -0,0 +1,7 @@
+void func(int *a, int n) {
+    n = n / 4 * 4;
+    a = (int *)__builtin_assume_aligned(a, 16);
+    for (int i = 0; i < n; i++) {
+        a[i] = i;
+    }
+}
diff --git a/04/4_simd/08_vectorize_0_to_n_mod4_aligned/run.sh b/04/4_simd/08_vectorize_0_to_n_mod4_aligned/run.sh
new file mode 100755
index 00000000..3553d279
--- /dev/null
+++ b/04/4_simd/08_vectorize_0_to_n_mod4_aligned/run.sh
@@ -0,0 +1,4 @@
+set -e
+
+gcc -O3 -fomit-frame-pointer -fverbose-asm -S main.cpp -o /tmp/main.S
+vim /tmp/main.S
diff --git a/04/slides.pptx b/04/slides.pptx
index f626141b..f64f71f6 100644
Binary files a/04/slides.pptx and b/04/slides.pptx differ