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alpha: fix floor on sNaN input

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The alpha version of floor wrongly return sNaN for sNaN input. Fix that
by checking for NaN and by returning the input value added with itself
in that case.

Finally remove the code to handle inexact exception, floor should never
generate such an exception.

Changelog:
	* sysdeps/alpha/fpu/s_floor.c (__floor): Add argument with itself
	when it is a NaN.
	[_IEEE_FP_INEXACT] Remove.
	* sysdeps/alpha/fpu/s_floorf.c (__floorf): Likewise.
This commit is contained in:
Aurelien Jarno 2016-08-02 09:18:59 +02:00
parent 062e53c195
commit 65cc568cf5
3 changed files with 10 additions and 8 deletions
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4
ChangeLog
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@ -4,6 +4,10 @@
when it is a NaN.
[_IEEE_FP_INEXACT] Remove.
* sysdeps/alpha/fpu/s_ceilf.c (__ceilf): Likewise.
* sysdeps/alpha/fpu/s_floor.c (__floor): Add argument with itself
when it is a NaN.
[_IEEE_FP_INEXACT] Remove.
* sysdeps/alpha/fpu/s_floorf.c (__floorf): Likewise.
2016-08-01 Carlos O'Donell <carlos@redhat.com>

7
sysdeps/alpha/fpu/s_floor.c
View File

@ -27,16 +27,15 @@
double
__floor (double x)
{
if (isnan (x))
return x + x;
if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */
{
double tmp1, new_x;
__asm (
#ifdef _IEEE_FP_INEXACT
"cvttq/svim %2,%1\n\t"
#else
"cvttq/svm %2,%1\n\t"
#endif
"cvtqt/m %1,%0\n\t"
: "=f"(new_x), "=&f"(tmp1)
: "f"(x));

7
sysdeps/alpha/fpu/s_floorf.c
View File

@ -26,6 +26,9 @@
float
__floorf (float x)
{
if (isnanf (x))
return x + x;
if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */
{
/* Note that Alpha S_Floating is stored in registers in a
@ -36,11 +39,7 @@ __floorf (float x)
float tmp1, tmp2, new_x;
__asm ("cvtst/s %3,%2\n\t"
#ifdef _IEEE_FP_INEXACT
"cvttq/svim %2,%1\n\t"
#else
"cvttq/svm %2,%1\n\t"
#endif
"cvtqt/m %1,%0\n\t"
: "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2)
: "f"(x));