tests/tcg/mips: Add tests for R5900 DIVU1

Add a test for DIVU1.

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Fredrik Noring <noring@nocrew.org>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>

tests/tcg/mips/mipsr5900/Makefile

@@ -9,6 +9,7 @@ CC      = $(CROSS)gcc
 CFLAGS  = -Wall -mabi=32 -march=r5900 -static
 
 TESTCASES = div1.tst
+TESTCASES += divu1.tst
 TESTCASES += mflohi1.tst
 TESTCASES += mtlohi1.tst
 TESTCASES += mult.tst

tests/tcg/mips/mipsr5900/divu1.c

@@ -0,0 +1,48 @@
+/*
+ * Test R5900-specific DIVU1.
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <assert.h>
+
+struct quotient_remainder { uint32_t quotient, remainder; };
+
+static struct quotient_remainder divu1(uint32_t rs, uint32_t rt)
+{
+    uint32_t lo, hi;
+
+    __asm__ __volatile__ (
+            "    divu1 $0, %2, %3\n"
+            "    mflo1 %0\n"
+            "    mfhi1 %1\n"
+            : "=r" (lo), "=r" (hi)
+            : "r" (rs), "r" (rt));
+
+    assert(rs / rt == lo);
+    assert(rs % rt == hi);
+
+    return (struct quotient_remainder) { .quotient = lo, .remainder = hi };
+}
+
+static void verify_divu1(uint32_t rs, uint32_t rt,
+                         uint32_t expected_quotient,
+                         uint32_t expected_remainder)
+{
+    struct quotient_remainder qr = divu1(rs, rt);
+
+    assert(qr.quotient == expected_quotient);
+    assert(qr.remainder == expected_remainder);
+}
+
+int main()
+{
+    verify_divu1(0, 1, 0, 0);
+    verify_divu1(1, 1, 1, 0);
+    verify_divu1(1, 2, 0, 1);
+    verify_divu1(17, 19, 0, 17);
+    verify_divu1(19, 17, 1, 2);
+    verify_divu1(77773, 101, 770, 3);
+
+    return 0;
+}