mirror of https://github.com/xemu-project/xemu.git
40 lines
904 B
C
40 lines
904 B
C
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/*
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* Test R5900-specific three-operand MULTU.
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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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static uint64_t multu(uint32_t rs, uint32_t rt)
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{
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uint32_t rd, lo, hi;
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uint64_t r;
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__asm__ __volatile__ (
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" multu %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));
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r = ((uint64_t)hi << 32) | (uint32_t)lo;
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assert((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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int main()
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{
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assert(multu(17, 19) == 323);
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assert(multu(77773, 99991) == 7776600043);
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assert(multu(12207031, 305175781) == 3725290219116211);
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assert(multu(0x80000000U, 0x7FFFFFFF) == 0x3FFFFFFF80000000);
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assert(multu(0x80000000U, 0x80000000U) == 0x4000000000000000);
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assert(multu(0xFFFFFFFFU, 0xFFFFFFFFU) == 0xFFFFFFFE00000001U);
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return 0;
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}
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