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qa: avoid cast that preclude strict aliasing

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This commit is contained in:
Giacomo Tesio 2017-05-19 01:09:51 +02:00
parent 913b1361dc
commit fa15f817c4
1 changed files with 19 additions and 2 deletions
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21
qa/kern/float.c
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@ -29,14 +29,31 @@ tstdiv(double p)
fprint(2, "1/%0.20g = %0.20g\n", p, r); fprint(2, "1/%0.20g = %0.20g\n", p, r);
} }
typedef union I2UL
{
int d[2];
unsigned long l;
}I2UL;
typedef union D2UL
{
double d;
unsigned long l;
}D2UL;
void void
main(void) main(void)
{ {
double p = DPREC; double p = DPREC;
int d[2] = { DIEEELO, DIEEEHI }; int d[2] = { DIEEELO, DIEEEHI };
I2UL i2l;
D2UL d2l;
uint64_t dieee, q; uint64_t dieee, q;
dieee = *(uint64_t*)d;
q = *(uint64_t*)&p; i2l.d[0] = d[0];
i2l.d[1] = d[1];
dieee = i2l.l;
d2l.d = p;
q = d2l.l;
err = 0; err = 0;
notify(catcher); notify(catcher);