Added Pico Co-Processor Interface (PCPI)

1 files changed, 79 insertions, 0 deletions

diff --git a/firmware/multest.c b/firmware/multest.c
new file mode 100644
index 0000000..3d41267
--- /dev/null
+++ b/firmware/multest.c
@@ -0,0 +1,79 @@
+#include "firmware.h"
+
+uint32_t xorshift32() {
+	static uint32_t x = 314159265;
+	x ^= x << 13;
+	x ^= x >> 17;
+	x ^= x << 5;
+	return x;
+}
+
+void multest()
+{
+	int i;
+	for (i = 0; i < 10; i++)
+	{
+		uint32_t a = xorshift32();
+		uint32_t b = xorshift32();
+
+		uint64_t au = a, bu = b;
+		int64_t as = (int32_t)a, bs = (int32_t)b;
+
+		print_str("input [");
+		print_hex(as >> 32);
+		print_str("] ");
+		print_hex(a);
+		print_str(" [");
+		print_hex(bs >> 32);
+		print_str("] ");
+		print_hex(b);
+		print_chr('\n');
+
+		uint32_t h_mul, h_mulh, h_mulhsu, h_mulhu;
+		print_str("hard   ");
+
+		h_mul = hard_mul(a, b);
+		print_hex(h_mul);
+		print_str("  ");
+
+		h_mulh = hard_mulh(a, b);
+		print_hex(h_mulh);
+		print_str("  ");
+
+		h_mulhsu = hard_mulhsu(a, b);
+		print_hex(h_mulhsu);
+		print_str("  ");
+
+		h_mulhu = hard_mulhu(a, b);
+		print_hex(h_mulhu);
+		print_chr('\n');
+
+		uint32_t s_mul, s_mulh, s_mulhsu, s_mulhu;
+		print_str("soft   ");
+
+		s_mul = a * b;
+		print_hex(s_mul);
+		print_str("  ");
+
+		s_mulh = (as * bs) >> 32;
+		print_hex(s_mulh);
+		print_str("  ");
+
+		s_mulhsu = (as * bu) >> 32;
+		print_hex(s_mulhsu);
+		print_str("  ");
+
+		s_mulhu = (au * bu) >> 32;
+		print_hex(s_mulhu);
+		print_str("  ");
+
+		if (s_mul != h_mul || s_mulh != h_mulh || s_mulhsu != h_mulhsu || s_mulhu != h_mulhu) {
+			print_str("ERROR!\n");
+			asm volatile ("sbreak");
+			return;
+		}
+
+		print_str(" OK\n");
+	}
+}
+