mirror of https://gitee.com/openkylin/qemu.git
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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/*
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* Test R5900-specific three-operand MULT.
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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 int64_t mult(int32_t rs, int32_t rt)
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{
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int32_t rd, lo, hi;
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int64_t r;
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__asm__ __volatile__ (
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" mult %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 = ((int64_t)hi << 32) | (uint32_t)lo;
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assert((int64_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 void verify_mult_negations(int32_t rs, int32_t rt, int64_t expected)
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{
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assert(mult(rs, rt) == expected);
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assert(mult(-rs, rt) == -expected);
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assert(mult(rs, -rt) == -expected);
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assert(mult(-rs, -rt) == expected);
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}
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int main()
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{
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verify_mult_negations(17, 19, 323);
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verify_mult_negations(77773, 99991, 7776600043);
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verify_mult_negations(12207031, 305175781, 3725290219116211);
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assert(mult(-0x80000000, 0x7FFFFFFF) == -0x3FFFFFFF80000000);
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assert(mult(-0x80000000, -0x7FFFFFFF) == 0x3FFFFFFF80000000);
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assert(mult(-0x80000000, -0x80000000) == 0x4000000000000000);
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return 0;
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}
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