From f657fe4b9f734d7fdea515af8dffbf7c28ce4fbc Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Thu, 5 Sep 2013 18:05:07 +0000 Subject: math: support invalid ld80 representations in fpclassify apparently gnulib requires invalid long double representations to be handled correctly in printf so we classify them according to how the fpu treats them: bad inf is nan, bad nan is nan, bad normal is nan and bad subnormal/zero is minimal normal --- src/math/__fpclassifyl.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/math/__fpclassifyl.c b/src/math/__fpclassifyl.c index 6365c588..6dc10025 100644 --- a/src/math/__fpclassifyl.c +++ b/src/math/__fpclassifyl.c @@ -3,13 +3,15 @@ #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 -/* invalid representations (top bit of u.i.m is wrong) are not handled */ int __fpclassifyl(long double x) { union ldshape u = {x}; int e = u.i.se & 0x7fff; - if (!e) + int msb = u.i.m>>63; + if (!e && !msb) return u.i.m ? FP_SUBNORMAL : FP_ZERO; + if (!msb) + return FP_NAN; if (e == 0x7fff) return u.i.m << 1 ? FP_NAN : FP_INFINITE; return FP_NORMAL; -- cgit v1.2.1