--- /dev/null
+#include<stdio.h>
+#include<assert.h>
+
+int main()
+{
+ int rt, ach, acl, dsp;
+ int result;
+
+ ach = 0x05;
+ acl = 0xB4CB;
+ result = 0xA0001699;
+ __asm
+ ("mthi %2, $ac1\n\t"
+ "mtlo %3, $ac1\n\t"
+ "extr.w %0, $ac1, 0x03\n\t"
+ "rddsp %1\n\t"
+ : "=r"(rt), "=r"(dsp)
+ : "r"(ach), "r"(acl)
+ );
+ dsp = (dsp >> 23) & 0x01;
+ assert(dsp == 1);
+ assert(result == rt);
+
+ /* Clear dspcontrol */
+ dsp = 0;
+ __asm
+ ("wrdsp %0\n\t"
+ :
+ : "r"(dsp)
+ );
+
+ ach = 0x01;
+ acl = 0xB4CB;
+ result = 0x10000B4C;
+ __asm
+ ("mthi %2, $ac1\n\t"
+ "mtlo %3, $ac1\n\t"
+ "extr.w %0, $ac1, 0x04\n\t"
+ "rddsp %1\n\t"
+ : "=r"(rt), "=r"(dsp)
+ : "r"(ach), "r"(acl)
+ );
+ dsp = (dsp >> 23) & 0x01;
+ assert(dsp == 0);
+ assert(result == rt);
+
+ /* Clear dspcontrol */
+ dsp = 0;
+ __asm
+ ("wrdsp %0\n\t"
+ :
+ : "r"(dsp)
+ );
+
+ ach = 0x3fffffff;
+ acl = 0x2bcdef01;
+ result = 0x7ffffffe;
+ __asm
+ ("mthi %2, $ac1\n\t"
+ "mtlo %3, $ac1\n\t"
+ "extr.w %0, $ac1, 0x1F\n\t"
+ "rddsp %1\n\t"
+ : "=r"(rt), "=r"(dsp)
+ : "r"(ach), "r"(acl)
+ );
+ dsp = (dsp >> 23) & 0x01;
+ assert(dsp == 0);
+ assert(result == rt);
+
+ /* Clear dspcontrol */
+ dsp = 0;
+ __asm
+ ("wrdsp %0\n\t"
+ :
+ : "r"(dsp)
+ );
+
+ ach = 0xFFFFFFFF;
+ acl = 0xFFFFFFFF;
+ result = 0xFFFFFFFF;
+ __asm
+ ("mthi %2, $ac1\n\t"
+ "mtlo %3, $ac1\n\t"
+ "extr.w %0, $ac1, 0x1F\n\t"
+ "rddsp %1\n\t"
+ : "=r"(rt), "=r"(dsp)
+ : "r"(ach), "r"(acl)
+ );
+ dsp = (dsp >> 23) & 0x01;
+ assert(dsp == 0);
+ assert(result == rt);
+
+ return 0;
+}