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#include<stdio.h>
#include<assert.h>
int main()
{
int rd, rs, rt, dsp;
int result, resultdsp;
rs = 0x12345678;
rt = 0x87654321;
result = 0x7FFFFFFF;
resultdsp = 0x01;
__asm
("wrdsp $0\n\t"
"subq_s.w %0, %2, %3\n\t"
"rddsp %1\n\t"
: "=r"(rd), "=r"(dsp)
: "r"(rs), "r"(rt)
);
dsp = (dsp >> 20) & 0x01;
assert(dsp == resultdsp);
assert(rd == result);
rs = 0x66666;
rt = 0x55555;
result = 0x11111;
resultdsp = 0x0;
__asm
("wrdsp $0\n\t"
"subq_s.w %0, %2, %3\n\t"
"rddsp %1\n\t"
: "=r"(rd), "=r"(dsp)
: "r"(rs), "r"(rt)
);
dsp = (dsp >> 20) & 0x01;
assert(dsp == resultdsp);
assert(rd == result);
rs = 0x0;
rt = 0x80000000;
result = 0x7FFFFFFF;
resultdsp = 0x01;
__asm
("wrdsp $0\n\t"
"subq_s.w %0, %2, %3\n\t"
"rddsp %1\n\t"
: "=r"(rd), "=r"(dsp)
: "r"(rs), "r"(rt)
);
dsp = (dsp >> 20) & 0x01;
assert(dsp == resultdsp);
assert(rd == result);
rs = 0x80000000;
rt = 0x80000000;
result = 0;
resultdsp = 0x00;
__asm
("wrdsp $0\n\t"
"subq_s.w %0, %2, %3\n\t"
"rddsp %1\n\t"
: "=r"(rd), "=r"(dsp)
: "r"(rs), "r"(rt)
);
dsp = (dsp >> 20) & 0x01;
assert(dsp == resultdsp);
assert(rd == result);
return 0;
}
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