MPPA - added PRNG generator in the tests

3 files changed, 66 insertions, 0 deletions

diff --git a/test/mppa/lib/Makefile b/test/mppa/lib/Makefile
new file mode 100644
index 00000000..10f40f23
--- /dev/null
+++ b/test/mppa/lib/Makefile
@@ -0,0 +1,18 @@
+prng-test-x86: prng.c
+	gcc -D__UNIT_TEST__ -O2 -std=c99 $< -o $@
+
+.PHONY:
+test: test-x86
+
+.PHONY:
+test-x86: prng-test-x86
+	@if ! ./$<; then\
+		>&2 echo "ERROR: $< failed";\
+		exit;\
+	else\
+		echo "Test Succeeded";\
+	fi
+
+.PHONY:
+clean:
+	rm -f prng-test-x86
diff --git a/test/mppa/lib/prng.c b/test/mppa/lib/prng.c
new file mode 100644
index 00000000..5846038c
--- /dev/null
+++ b/test/mppa/lib/prng.c
@@ -0,0 +1,40 @@
+// https://en.wikipedia.org/wiki/Linear_congruential_generator -> MMIX Donald Knuth
+// modulo 2^64 = no need to do it explicitly
+
+#define MULTIPLIER 6364136223846793005LL
+#define INCREMENT 1442695040888963407LL
+
+static unsigned long long current;
+
+void srand(long long seed){
+    seed = current;
+}
+
+unsigned long long randlong(void){
+    return (current = MULTIPLIER * current + INCREMENT);
+}
+
+#ifdef __UNIT_TEST__
+char bytewise_sum(unsigned long long to_check){
+    char sum = 0;
+
+    for (int i = 0 ; i < 8 ; i++)
+        sum += (to_check & (unsigned long long)(0xFFULL << i*8)) >> i*8;
+
+    return sum;
+}
+
+int main(void){
+    srand(42);
+
+    if (bytewise_sum(0xdeadbeefb00b1355ULL) != 91)
+        return 1;
+
+    for (int i = 0 ; i < 1000 ; i++)
+        randlong();
+
+    unsigned long long last = randlong();
+
+    return !((unsigned char)bytewise_sum(last) == 251);
+}
+#endif // __UNIT_TEST__
diff --git a/test/mppa/lib/prng.h b/test/mppa/lib/prng.h
new file mode 100644
index 00000000..fee8c865
--- /dev/null
+++ b/test/mppa/lib/prng.h
@@ -0,0 +1,8 @@
+#ifndef __PRNG_H__
+#define __PRNG_H__
+
+void srand(long long seed);
+
+long long randlong(void);
+
+#endif // __PRNG_H__