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-rw-r--r--lib/isnan.c25
1 files changed, 14 insertions, 11 deletions
diff --git a/lib/isnan.c b/lib/isnan.c
index e977be15d..7779e4d8b 100644
--- a/lib/isnan.c
+++ b/lib/isnan.c
@@ -83,7 +83,7 @@ int
FUNC (DOUBLE x)
{
#ifdef KNOWN_EXPBIT0_LOCATION
-# if defined USE_LONG_DOUBLE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
+# if defined USE_LONG_DOUBLE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
/* Special CPU dependent code is needed to treat bit patterns outside the
IEEE 754 specification (such as Pseudo-NaNs, Pseudo-Infinities,
Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals) as NaNs.
@@ -117,17 +117,20 @@ FUNC (DOUBLE x)
# else
/* Be careful to not do any floating-point operation on x, such as x == x,
because x may be a signaling NaN. */
-# if defined __TINYC__ || defined __SUNPRO_C || defined __DECC \
- || (defined __sgi && !defined __GNUC__) || defined __ICC
- /* The Sun C 5.0, Intel ICC 10.0, and Compaq (ex-DEC) 6.4 compilers don't
- recognize the initializers as constant expressions. The latter compiler
- also fails when constant-folding 0.0 / 0.0 even when constant-folding is
- not required. The SGI MIPSpro C compiler complains about "floating-point
- operation result is out of range". */
+# if defined __SUNPRO_C || defined __ICC || defined _MSC_VER \
+ || defined __DECC || defined __TINYC__ \
+ || (defined __sgi && !defined __GNUC__)
+ /* The Sun C 5.0, Intel ICC 10.0, Microsoft Visual C/C++ 9.0, Compaq (ex-DEC)
+ 6.4, and TinyCC compilers don't recognize the initializers as constant
+ expressions. The Compaq compiler also fails when constant-folding
+ 0.0 / 0.0 even when constant-folding is not required. The Microsoft
+ Visual C/C++ compiler also fails when constant-folding 1.0 / 0.0 even
+ when constant-folding is not required. The SGI MIPSpro C compiler
+ complains about "floating-point operation result is out of range". */
static DOUBLE zero = L_(0.0);
memory_double nan;
- DOUBLE plus_inf = L_(1.0) / L_(0.0);
- DOUBLE minus_inf = -L_(1.0) / L_(0.0);
+ DOUBLE plus_inf = L_(1.0) / zero;
+ DOUBLE minus_inf = -L_(1.0) / zero;
nan.value = zero / zero;
# else
static memory_double nan = { L_(0.0) / L_(0.0) };
@@ -154,7 +157,7 @@ FUNC (DOUBLE x)
the signaling NaNs, handle only the quiet NaNs. */
if (x == x)
{
-# if defined USE_LONG_DOUBLE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
+# if defined USE_LONG_DOUBLE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
/* Detect any special bit patterns that pass ==; see comment above. */
memory_double m1;
memory_double m2;