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71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/*
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* Test R5900-specific three-operand MADDU and MADDU1.
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*/
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#include <stdio.h>
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#include <inttypes.h>
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#include <assert.h>
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uint64_t maddu(uint64_t a, uint32_t rs, uint32_t rt)
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{
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uint32_t lo = a;
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uint32_t hi = a >> 32;
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uint32_t rd;
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uint64_t r;
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__asm__ __volatile__ (
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" mtlo %5\n"
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" mthi %6\n"
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" maddu %0, %3, %4\n"
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" mflo %1\n"
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" mfhi %2\n"
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: "=r" (rd), "=r" (lo), "=r" (hi)
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: "r" (rs), "r" (rt), "r" (lo), "r" (hi));
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r = ((uint64_t)hi << 32) | (uint32_t)lo;
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assert(a + (uint64_t)rs * rt == r);
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assert(rd == lo);
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return r;
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}
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uint64_t maddu1(uint64_t a, uint32_t rs, uint32_t rt)
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{
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uint32_t lo = a;
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uint32_t hi = a >> 32;
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uint32_t rd;
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uint64_t r;
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__asm__ __volatile__ (
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" mtlo1 %5\n"
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" mthi1 %6\n"
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" maddu1 %0, %3, %4\n"
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" mflo1 %1\n"
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" mfhi1 %2\n"
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: "=r" (rd), "=r" (lo), "=r" (hi)
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: "r" (rs), "r" (rt), "r" (lo), "r" (hi));
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r = ((uint64_t)hi << 32) | (uint32_t)lo;
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assert(a + (uint64_t)rs * rt == r);
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assert(rd == lo);
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return r;
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}
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static int64_t maddu_variants(int64_t a, int32_t rs, int32_t rt)
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{
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int64_t rd = maddu(a, rs, rt);
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int64_t rd1 = maddu1(a, rs, rt);
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assert(rd == rd1);
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return rd;
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}
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int main()
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{
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assert(maddu_variants(13, 17, 19) == 336);
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return 0;
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}
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