1 files changed, 47 insertions, 0 deletions
diff --git a/tests/tcg/mips/mipsr5900/mult.c b/tests/tcg/mips/mipsr5900/mult.c
new file mode 100644
index 0000000000..2c0c16d232
--- /dev/null
+++ b/tests/tcg/mips/mipsr5900/mult.c
@@ -0,0 +1,47 @@
+/*
+ * Test R5900-specific three-operand MULT.
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <assert.h>
+
+static int64_t mult(int32_t rs, int32_t rt)
+{
+    int32_t rd, lo, hi;
+    int64_t r;
+
+    __asm__ __volatile__ (
+            "    mult %0, %3, %4\n"
+            "    mflo %1\n"
+            "    mfhi %2\n"
+            : "=r" (rd), "=r" (lo), "=r" (hi)
+            : "r" (rs), "r" (rt));
+    r = ((int64_t)hi << 32) | (uint32_t)lo;
+
+    assert((int64_t)rs * rt == r);
+    assert(rd == lo);
+
+    return r;
+}
+
+static void verify_mult_negations(int32_t rs, int32_t rt, int64_t expected)
+{
+    assert(mult(rs, rt) == expected);
+    assert(mult(-rs, rt) == -expected);
+    assert(mult(rs, -rt) == -expected);
+    assert(mult(-rs, -rt) == expected);
+}
+
+int main()
+{
+    verify_mult_negations(17, 19, 323);
+    verify_mult_negations(77773, 99991, 7776600043);
+    verify_mult_negations(12207031, 305175781, 3725290219116211);
+
+    assert(mult(-0x80000000,  0x7FFFFFFF) == -0x3FFFFFFF80000000);
+    assert(mult(-0x80000000, -0x7FFFFFFF) ==  0x3FFFFFFF80000000);
+    assert(mult(-0x80000000, -0x80000000) ==  0x4000000000000000);
+
+    return 0;
+}