59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
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#include<stdio.h>
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#include<assert.h>
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int main()
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{
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int rd, rs, rt, dsp;
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int result, resultdsp;
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rs = 0x12345678;
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rt = 0x87654321;
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result = 0x7FFFFFFF;
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resultdsp = 0x01;
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__asm
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("subq_s.w %0, %2, %3\n\t"
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"rddsp %1\n\t"
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: "=r"(rd), "=r"(dsp)
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: "r"(rs), "r"(rt)
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);
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dsp = (dsp >> 20) & 0x01;
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assert(dsp == resultdsp);
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assert(rd == result);
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rs = 0x66666;
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rt = 0x55555;
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result = 0x11111;
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resultdsp = 0x01;
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__asm
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("subq_s.w %0, %2, %3\n\t"
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"rddsp %1\n\t"
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: "=r"(rd), "=r"(dsp)
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: "r"(rs), "r"(rt)
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);
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dsp = (dsp >> 20) & 0x01;
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assert(dsp == resultdsp);
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assert(rd == result);
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#if 0
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rs = 0x35555555;
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rt = 0xf5555555;
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result = 0x80000000;
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resultdsp = 0x01;
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__asm
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("subq_s.w %0, %2, %3\n\t"
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"rddsp %1\n\t"
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: "=r"(rd), "=r"(dsp)
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: "r"(rs), "r"(rt)
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);
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dsp = (dsp >> 20) & 0x01;
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assert(dsp == resultdsp);
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assert(rd == result);
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#endif
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return 0;
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}
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