29851ee7c8
This change corrects and simplifies how discard is calculated for shift left logical vector instructions. It is used to detect overflow and set bit 22 in the DSPControl register. The existing tests (shll_ph.c, shll_qb.c) are extended with the corner cases that expose incorrectness in the previous implementation. Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
56 lines
1.0 KiB
C
56 lines
1.0 KiB
C
#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, rt, dsp;
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int result, resultdsp;
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rt = 0x12345678;
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result = 0xA000C000;
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resultdsp = 1;
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__asm
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("wrdsp $0\n\t"
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"shll.ph %0, %2, 0x0B\n\t"
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"rddsp %1\n\t"
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: "=r"(rd), "=r"(dsp)
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: "r"(rt)
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);
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dsp = (dsp >> 22) & 0x01;
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assert(dsp == resultdsp);
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assert(rd == result);
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rt = 0x7fff8000;
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result = 0xfffe0000;
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resultdsp = 1;
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__asm
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("wrdsp $0\n\t"
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"shll.ph %0, %2, 0x01\n\t"
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"rddsp %1\n\t"
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: "=r"(rd), "=r"(dsp)
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: "r"(rt)
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);
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dsp = (dsp >> 22) & 0x01;
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assert(dsp == resultdsp);
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assert(rd == result);
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rt = 0x00000001;
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result = 0x00008000;
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resultdsp = 1;
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__asm
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("wrdsp $0\n\t"
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"shll.ph %0, %2, 0x0F\n\t"
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"rddsp %1\n\t"
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: "=r"(rd), "=r"(dsp)
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: "r"(rt)
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);
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dsp = (dsp >> 22) & 0x01;
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assert(dsp == resultdsp);
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assert(rd == result);
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return 0;
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}
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