target-mips: Add ASE DSP testcases

Add MIPS ASE DSP testcases.

Signed-off-by: Jia Liu <proljc@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

tests/tcg/mips/mips32-dsp/addsc.c

@@ -0,0 +1,33 @@
+#include<stdio.h>
+#include<assert.h>
+
+int main()
+{
+    int rd, rs, rt;
+    int dsp;
+    int result;
+
+    rs     = 0x0000000F;
+    rt     = 0x00000001;
+    result = 0x00000010;
+    __asm
+        ("addsc %0, %1, %2\n\t"
+         : "=r"(rd)
+         : "r"(rs), "r"(rt)
+        );
+    assert(rd == result);
+
+    rs     = 0xFFFF0FFF;
+    rt     = 0x00010111;
+    result = 0x00001110;
+    __asm
+        ("addsc %0, %2, %3\n\t"
+         "rddsp %1\n\t"
+         : "=r"(rd), "=r"(dsp)
+         : "r"(rs), "r"(rt)
+        );
+    assert(rd == result);
+    assert(((dsp >> 13) & 0x01) == 1);
+
+    return 0;
+}