e62a214cd4
The pos field in the DSPControl register is not correctly initialized. Per documentation, the result of MTHLIP is unpredictable if the value of the pos field before the execution is greater than 32. Signed-off-by: Petar Jovanovic <petarj@mips.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
59 lines
1.2 KiB
C
59 lines
1.2 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 rs, ach, acl, dsp;
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int result, resulth, resultl;
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dsp = 0x07;
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ach = 0x05;
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acl = 0xB4CB;
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rs = 0x00FFBBAA;
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resulth = 0xB4CB;
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resultl = 0x00FFBBAA;
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result = 0x27;
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__asm
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("wrdsp %0, 0x01\n\t"
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"mthi %1, $ac1\n\t"
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"mtlo %2, $ac1\n\t"
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"mthlip %3, $ac1\n\t"
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"mfhi %1, $ac1\n\t"
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"mflo %2, $ac1\n\t"
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"rddsp %0\n\t"
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: "+r"(dsp), "+r"(ach), "+r"(acl)
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: "r"(rs)
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);
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dsp = dsp & 0x3F;
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assert(dsp == result);
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assert(ach == resulth);
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assert(acl == resultl);
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dsp = 0x1f;
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ach = 0x05;
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acl = 0xB4CB;
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rs = 0x00FFBBAA;
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resulth = 0xB4CB;
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resultl = 0x00FFBBAA;
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result = 0x3f;
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__asm
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("wrdsp %0, 0x01\n\t"
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"mthi %1, $ac1\n\t"
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"mtlo %2, $ac1\n\t"
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"mthlip %3, $ac1\n\t"
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"mfhi %1, $ac1\n\t"
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"mflo %2, $ac1\n\t"
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"rddsp %0\n\t"
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: "+r"(dsp), "+r"(ach), "+r"(acl)
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: "r"(rs)
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);
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dsp = dsp & 0x3F;
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assert(dsp == result);
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assert(ach == resulth);
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assert(acl == resultl);
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return 0;
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}
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