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x86 long double: Support pseudo numbers in isnanl

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This syncs up isnanl behaviour with gcc.  Also move the isnanl
implementation to sysdeps/x86 and remove the sysdeps/x86_64 version.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Siddhesh Poyarekar 2020-12-23 14:02:02 +05:30
parent b7f8815617
commit 94547d9209
2 changed files with 7 additions and 6 deletions
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12
sysdeps/i386/fpu/s_isnanl.c → sysdeps/x86/fpu/s_isnanl.c
View File

@ -28,16 +28,18 @@ static char rcsid[] = "$NetBSD: $";
int __isnanl(long double x)
{
int32_t se,hx,lx;
int32_t se,hx,lx,pn;
GET_LDOUBLE_WORDS(se,hx,lx,x);
se = (se & 0x7fff) << 1;
/* The additional & 0x7fffffff is required because Intel's
extended format has the normally implicit 1 explicit
present. Sigh! */
/* Detect pseudo-normal numbers, i.e. exponent is non-zero and the top
bit of the significand is not set. */
pn = (uint32_t)((~hx & 0x80000000) & (se|(-se)))>>31;
/* Clear the significand bit when computing mantissa. */
lx |= hx & 0x7fffffff;
se |= (uint32_t)(lx|(-lx))>>31;
se = 0xfffe - se;
return (int)((uint32_t)(se))>>16;
return (int)(((uint32_t)(se)) >> 16) | pn;
}
hidden_def (__isnanl)
weak_alias (__isnanl, isnanl)

1
sysdeps/x86_64/fpu/s_isnanl.c
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@ -1 +0,0 @@
#include <sysdeps/i386/fpu/s_isnanl.c>