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MFC: r205410

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Avoid aliasing which leads to incorrect results when compiling with the
default strict aliasing rules.

PR:		144900
Submitted by:	Peter Jeremy
This commit is contained in:
Marius Strobl 2010-03-30 19:13:37 +00:00
parent 1185606b8c
commit aa1750167b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/stable/8/; revision=205905
1 changed files with 11 additions and 12 deletions
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23
lib/libc/sparc64/fpu/fpu_explode.c
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@ -139,9 +139,9 @@ __fpu_xtof(fp, i)
* a signed or unsigned entity.
*/
if (fp->fp_sign && (int64_t)i < 0)
*((int64_t*)fp->fp_mant) = -i;
*((int64_t *)fp->fp_mant) = -i;
else
*((int64_t*)fp->fp_mant) = i;
*((int64_t *)fp->fp_mant) = i;
fp->fp_mant[2] = 0;
fp->fp_mant[3] = 0;
__fpu_norm(fp);
@ -262,14 +262,12 @@ __fpu_explode(fe, fp, type, reg)
struct fpn *fp;
int type, reg;
{
u_int32_t s, *sp;
u_int64_t l[2];
void *vl = l;
u_int64_t l0, l1;
u_int32_t s;
if (type == FTYPE_LNG || type == FTYPE_DBL || type == FTYPE_EXT) {
l[0] = __fpu_getreg64(reg & ~1);
sp = vl;
fp->fp_sign = sp[0] >> 31;
l0 = __fpu_getreg64(reg & ~1);
fp->fp_sign = l0 >> 63;
} else {
s = __fpu_getreg(reg);
fp->fp_sign = s >> 31;
@ -277,7 +275,7 @@ __fpu_explode(fe, fp, type, reg)
fp->fp_sticky = 0;
switch (type) {
case FTYPE_LNG:
s = __fpu_xtof(fp, l[0]);
s = __fpu_xtof(fp, l0);
break;
case FTYPE_INT:
@ -289,12 +287,13 @@ __fpu_explode(fe, fp, type, reg)
break;
case FTYPE_DBL:
s = __fpu_dtof(fp, sp[0], sp[1]);
s = __fpu_dtof(fp, l0 >> 32, l0 & 0xffffffff);
break;
case FTYPE_EXT:
l[1] = __fpu_getreg64((reg & ~1) + 2);
s = __fpu_qtof(fp, sp[0], sp[1], sp[2], sp[3]);
l1 = __fpu_getreg64((reg & ~1) + 2);
s = __fpu_qtof(fp, l0 >> 32, l0 & 0xffffffff, l1 >> 32,
l1 & 0xffffffff);
break;
default: