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#include <string.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#if defined(__x86_64__)
#error Nope!
#else
uint64_t _fucomip_(double a, double b)
{
uint32_t ret;
asm volatile (
"fldl %2\n"
"fldl %1\n"
"fucomip %%st(1)\n"
"fstp %%st(0)\n"
"pushfl\n"
"popl %%eax\n"
:"=a" (ret):"m"(a), "m"(b):"cc");
return ret;
}
uint64_t _fucompp_(double a, double b)
{
uint32_t ret;
asm volatile (
"fldl %2\n"
"fldl %1\n"
"fucompp\n"
"fstsw %%ax\n"
:"=a" (ret):"m"(a), "m"(b):"cc");
return ret;
}
uint64_t _fistpw_(double a, uint8_t rd)
{
uint16_t ret;
uint16_t t1, t2;
asm volatile (
"fldl %1\n"
"fstcw %2\n"
"mov %2, %%ax\n"
"mov %4, %%ah\n"
"mov %%ax, %3\n"
"fldcw %3\n"
"fistp %0\n"
"fldcw %2\n"
:"=m" (ret):"m"(a), "m"(t1), "m"(t2), "m"(rd):"cc");
return ret;
}
uint64_t _fisttpw_(double a, uint8_t rd)
{
uint16_t ret;
uint16_t t1, t2;
asm volatile (
"fldl %1\n"
"fstcw %2\n"
"mov %2, %%ax\n"
"mov %4, %%ah\n"
"mov %%ax, %3\n"
"fldcw %3\n"
"fisttp %0\n"
"fldcw %2\n"
:"=m" (ret):"m"(a), "m"(t1), "m"(t2), "m"(rd):"cc");
return ret;
}
uint64_t _fistpl_(double a, uint8_t rd)
{
uint32_t ret;
uint16_t t1, t2;
asm volatile (
"fldl %1\n"
"fstcw %2\n"
"mov %2, %%ax\n"
"mov %4, %%ah\n"
"mov %%ax, %3\n"
"fldcw %3\n"
"fistpl %0\n"
"fldcw %2\n"
:"=m" (ret):"m"(a), "m"(t1), "m"(t2), "m"(rd):"cc");
return ret;
}
uint64_t _fisttpl_(double a, uint8_t rd)
{
uint32_t ret;
uint16_t t1, t2;
asm volatile (
"fldl %1\n"
"fstcw %2\n"
"mov %2, %%ax\n"
"mov %4, %%ah\n"
"mov %%ax, %3\n"
"fldcw %3\n"
"fisttpl %0\n"
"fldcw %2\n"
:"=m" (ret):"m"(a), "m"(t1), "m"(t2), "m"(rd):"cc");
return ret;
}
uint64_t _fistpq_(double a, uint8_t rd)
{
uint64_t ret;
uint16_t t1, t2;
asm volatile (
"fldl %1\n"
"fstcw %2\n"
"mov %2, %%ax\n"
"mov %4, %%ah\n"
"mov %%ax, %3\n"
"fldcw %3\n"
"fistpq %0\n"
"fldcw %2\n"
:"=m" (ret):"m"(a), "m"(t1), "m"(t2), "m"(rd):"cc");
return ret;
}
uint64_t _fisttpq_(double a, uint8_t rd)
{
uint64_t ret;
uint16_t t1, t2;
asm volatile (
"fldl %1\n"
"fstcw %2\n"
"mov %2, %%ax\n"
"mov %4, %%ah\n"
"mov %%ax, %3\n"
"fldcw %3\n"
"fisttpq %0\n"
"fldcw %2\n"
:"=m" (ret):"m"(a), "m"(t1), "m"(t2), "m"(rd):"cc");
return ret;
}
uint64_t _frndint_(double a, uint8_t rd)
{
uint64_t ret;
uint16_t t1, t2;
asm volatile (
"fldl %1\n"
"fstcw %2\n"
"mov %2, %%ax\n"
"mov %4, %%ah\n"
"mov %%ax, %3\n"
"fldcw %3\n"
"frndint\n"
"fstpl %0\n"
"fldcw %2\n"
:"=m" (ret):"m"(a), "m"(t1), "m"(t2), "m"(rd):"cc");
return ret;
}
#endif
int main(int argc, const char** argv)
{
double a, b;
char pf, cf, zf;
char pa, ca, za;
uint64_t flags;
uint64_t tests[] = {
0x0,
0x4082c00000000000LL,
0x8000000000000000LL,
0x40dfffc000000000LL,
0x40e0002000000000LL, // 0x7fff and 0x8001 as double
0xc0e0002000000000LL,
0xc0dfffc000000000LL, // -0x8001 and -0x7fff as double
0x3ff0000000000000LL,
0x3fe89d9000000000LL,
0x7ff0000000000000LL,
0xfff0000000000000LL,
0x3ff0002ca0000000LL,
0xaeff000025000000LL,
0x3ff0000050000000LL,
0xc082c00000000000LL,
0x7ff8000000000001LL,
};
int n = sizeof(tests)/sizeof(tests[0]);
for(int i=0; i<n; ++i)
for(int j=0; j<n; ++j) {
*(uint64_t*)&a = tests[i];
*(uint64_t*)&b = tests[j];
printf("FUCOMI 0x%llx 0x%llx ", *(uint64_t*)&a, *(uint64_t*)&b);
flags = _fucomip_(a, b);
ca = (flags>>0)&1?'C':'-';
za = (flags>>(0+6))&1?'Z':'-';
pa = (flags>>(0+2))&1?'P':'-';
printf("%c%c%c\n", za, pa, ca);
printf("FUCOMPP 0x%llx 0x%llx ", *(uint64_t*)&a, *(uint64_t*)&b);
flags = _fucompp_(a, b);
ca = (flags>>8)&1?'C':'-';
za = (flags>>(8+6))&1?'Z':'-';
pa = (flags>>(8+2))&1?'P':'-';
printf("%c%c%c\n", za, pa, ca);
}
for(int i=0; i<n; ++i) {
*(uint64_t*)&a = tests[i];
for(int rd=0; rd<3; ++rd) {
printf("Rounding %d\n", rd);
printf(" FRNDINT 0x%llx => 0x%llx\n", *(uint64_t*)&a, _frndint_(a, rd<<2));
printf(" FISTP 0x%llx => word: %x\n", *(uint64_t*)&a, _fistpw_(a, rd<<2));
printf(" FISTP 0x%llx => long: %x\n", *(uint64_t*)&a, _fistpl_(a, rd<<2));
printf(" FISTP 0x%llx => quad: %llx\n", *(uint64_t*)&a, _fistpq_(a, rd<<2));
printf(" FISTTP 0x%llx => word: %x\n", *(uint64_t*)&a, _fisttpw_(a, rd<<2));
printf(" FISTTP 0x%llx => long: %x\n", *(uint64_t*)&a, _fisttpl_(a, rd<<2));
printf(" FISTTP 0x%llx => quad: %llx\n", *(uint64_t*)&a, _fisttpq_(a, rd<<2));
}
}
printf("\nDone\n");
}
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