tests/tcg: mips: Test R5900 three-operand MADDU

Test R5900 three-operand MADDU.
Reviewed-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: NFredrik Noring <noring@nocrew.org>

tests/tcg/mips/mipsr5900/Makefile

@@ -11,6 +11,7 @@ CFLAGS  = -Wall -mabi=32 -march=r5900 -static
 TESTCASES = div1.tst
 TESTCASES += divu1.tst
 TESTCASES += madd.tst
+TESTCASES += maddu.tst
 TESTCASES += mflohi1.tst
 TESTCASES += mtlohi1.tst
 TESTCASES += mult.tst

tests/tcg/mips/mipsr5900/maddu.c

+/*
+ * Test R5900-specific three-operand MADDU.
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <assert.h>
+
+uint64_t maddu(uint64_t a, uint32_t rs, uint32_t rt)
+{
+    uint32_t lo = a;
+    uint32_t hi = a >> 32;
+    uint32_t rd;
+    uint64_t r;
+
+    __asm__ __volatile__ (
+            "    mtlo  %5\n"
+            "    mthi  %6\n"
+            "    maddu %0, %3, %4\n"
+            "    mflo  %1\n"
+            "    mfhi  %2\n"
+            : "=r" (rd), "=r" (lo), "=r" (hi)
+            : "r" (rs), "r" (rt), "r" (lo), "r" (hi));
+    r = ((uint64_t)hi << 32) | (uint32_t)lo;
+
+    assert(a + (uint64_t)rs * rt == r);
+    assert(rd == lo);
+
+    return r;
+}
+
+int main()
+{
+    assert(maddu(13, 17, 19) == 336);
+
+    return 0;
+}