diff --git a/c-print-array/main.c b/c-print-array/main.c
index 50ce282..023adca 100644
--- a/c-print-array/main.c
+++ b/c-print-array/main.c
@@ -18,17 +18,17 @@ void _start(void)
 	putc(x[2]);
 
 	/* check with global iterator */
-	for (i = 0; i != 3; i++)
+	for (i = 0; i < 3; i++)
 		putc(x[i]);
 
 	/* check with local iterator w/o func call */
-	for (int j = 0; j != 3; j++) {
+	for (int j = 0; j < 3; j++) {
 		asm ("lio %0" : : "r"(x[j]));
 		asm ("tyo");
 	}
 
 	/* check with local iterator w/ func call */
-	for (int j = 0; j != 3; j++)
+	for (int j = 0; j < 3; j++)
 		putc(x[j]);
 
 	asm ("hlt");
diff --git a/c-test-comparison/Makefile b/c-test-comparison/Makefile
new file mode 100644
index 0000000..49d1aab
--- /dev/null
+++ b/c-test-comparison/Makefile
@@ -0,0 +1 @@
+include ../common/common.mk
diff --git a/c-test-comparison/main.c b/c-test-comparison/main.c
new file mode 100644
index 0000000..f72170c
--- /dev/null
+++ b/c-test-comparison/main.c
@@ -0,0 +1,54 @@
+static void putc(int);
+
+void _start(void)
+{
+	/* TODO: handle sp/fp init better -- separate crt0.S? */
+	asm ("law 03000");
+	asm ("dac 209");
+	asm ("law 04000");
+	asm ("dac 208");
+	
+	int x = 30;
+	int y = 30;
+
+	/* test if `==` works */
+	if (x == y)
+		putc(061); // a
+	if (x != y)
+		putc(062); // b
+
+	/* test if `!=` works */
+	x = 21;
+	y = 37;
+	if (x != y)
+		putc(063); // c
+	if (x == y)
+		putc(064); // d
+
+	/* test if `<` works */
+	if (x < y)
+		putc(065); // e
+	y = 21;
+	if (x < y)
+		putc(066); // f
+	
+	/* test if `>` works */
+	x = 41;
+	y = 37;
+	if (x > y)
+		putc(067); // g
+	x = 37;
+	if (x > y)
+		putc(070); // h
+	x = 21;
+	if (x > y)
+		putc(071); // i
+
+	asm ("hlt");
+	__builtin_unreachable();
+}
+
+static void putc(int c) {
+	asm ("lio %0" : : "r"(c));
+	asm ("tyo");
+}
diff --git a/pdp1-binutils b/pdp1-binutils
index e3bae5b..5baae65 160000
--- a/pdp1-binutils
+++ b/pdp1-binutils
@@ -1 +1 @@
-Subproject commit e3bae5bcbce9aa9e82bd2915985cfb7fca0b4066
+Subproject commit 5baae650c91509be6a417d0a0ccee547a4354640
diff --git a/pdp1-gcc b/pdp1-gcc
index 6e88e45..0be8d83 160000
--- a/pdp1-gcc
+++ b/pdp1-gcc
@@ -1 +1 @@
-Subproject commit 6e88e45863a08ddb13022b23568bb250705f44da
+Subproject commit 0be8d834a47ef2b399cdb453a68e6134b4fa2637
diff --git a/tests/test.exp b/tests/test.exp
index 304d72f..2eaddc4 100644
--- a/tests/test.exp
+++ b/tests/test.exp
@@ -28,3 +28,4 @@ run_test "c-print-x" "xx"
 run_test "c-print-struct" "xyz"
 run_test "c-print-array" "xyzxyzxyzxyz"
 run_test "c-print-for-loop" "xxxxyxxx"
+run_test "c-test-comparison" "aceg"