1 files changed, 48 insertions, 0 deletions
diff --git a/gp2x/test/align_test.c b/gp2x/test/align_test.c
new file mode 100644
index 0000000..b7b3512
--- /dev/null
+++ b/gp2x/test/align_test.c
@@ -0,0 +1,48 @@
+// Betting on GCC aligning this for efficiency.
+#include <stdio.h>
+
+int main()
+{
+  unsigned short int read_16 = 0xF1F2;
+  unsigned int read_32 = 0xF1F2F3F4;
+
+  unsigned short int write_16 = 0xF00D;
+  unsigned int write_32 = 0xF00DFEED;
+  // 16bit unsigned reads, we expect 0xF1F2 and 0xF20000F1
+  fprintf(stderr, "%04x %04x\n",
+   *((unsigned short int *)((char *)&read_16)),
+   *((unsigned short int *)((char *)&read_16 + 1)));
+
+  // 16bit signed reads, we expect 0xFFFFF1F2 and 0xFFFFFFF1
+  fprintf(stderr, "%04x %04x\n",
+   *((short int *)((char *)&read_16)),
+   *((short int *)((char *)&read_16 + 1)));
+
+  // 32bit reads, we expect 0xF1F2F3F4, 0xF4F1F2F3, 0xF3F4F1F2,
+  // and 0xF2F3F4F1
+
+  fprintf(stderr, "%08x %08x %08x %08x\n",
+   *((int *)((char *)&read_32)),
+   *((int *)((char *)&read_32 + 1)),
+   *((int *)((char *)&read_32 + 2)),
+   *((int *)((char *)&read_32 + 3)));
+
+  // 16bit writes, we expect write_16 to remain 0xF00D
+
+  *((short int *)((char *)&write_16)) = 0xF00D;
+  *((short int *)((char *)&write_16) + 1) = 0xF00D;
+
+  fprintf(stderr, "%04x\n", write_16);
+
+  // 32bit writes, we expect write_32 to remain 0xF00DFEED
+
+  *((int *)((char *)&write_16)) = 0xF00DFEED;
+  *((int *)((char *)&write_16) + 1) = 0xF00DFEED;
+  *((int *)((char *)&write_16) + 2) = 0xF00DFEED;
+  *((int *)((char *)&write_16) + 3) = 0xF00DFEED;
+
+  fprintf(stderr, "%08x\n", write_32);
+
+  return 0;
+}
+