From 1b6adf888de14675bc3207578dcb7132ed5f8ecc Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Sat, 17 Aug 2013 18:21:58 +0930 Subject: PowerPC floating point little-endian [1 of 15] http://sourceware.org/ml/libc-alpha/2013-08/msg00081.html This is the first of a series of patches to ban ieee854_long_double and the ieee854_long_double macros when using IBM long double. union ieee854_long_double just isn't correct for IBM long double, especially when little-endian, and pretending it is OK has allowed a number of bugs to remain undetected in sysdeps/ieee754/ldbl-128ibm/. This changes the few places in generic code that use it. * stdio-common/printf_size.c (__printf_size): Don't use union ieee854_long_double in fpnum union. * stdio-common/printf_fphex.c (__printf_fphex): Likewise. Use signbit macro to retrieve sign from long double. * stdio-common/printf_fp.c (___printf_fp): Use signbit macro to retrieve sign from long double. * sysdeps/ieee754/ldbl-128ibm/printf_fphex.c: Adjust for fpnum change. * sysdeps/ieee754/ldbl-128/printf_fphex.c: Likewise. * sysdeps/ieee754/ldbl-96/printf_fphex.c: Likewise. * sysdeps/x86_64/fpu/printf_fphex.c: Likewise. * math/test-misc.c (main): Don't use union ieee854_long_double. ports/ * sysdeps/ia64/fpu/printf_fphex.c: Adjust for fpnum change. --- sysdeps/ieee754/ldbl-96/printf_fphex.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'sysdeps/ieee754/ldbl-96/printf_fphex.c') diff --git a/sysdeps/ieee754/ldbl-96/printf_fphex.c b/sysdeps/ieee754/ldbl-96/printf_fphex.c index f356a4843e..715c93b500 100644 --- a/sysdeps/ieee754/ldbl-96/printf_fphex.c +++ b/sysdeps/ieee754/ldbl-96/printf_fphex.c @@ -25,11 +25,13 @@ do { \ /* The "strange" 80 bit format on ix86 and m68k has an explicit \ leading digit in the 64 bit mantissa. */ \ unsigned long long int num; \ + union ieee854_long_double u; \ + u.d = fpnum.ldbl; \ \ assert (sizeof (long double) == 12); \ \ - num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32 \ - | fpnum.ldbl.ieee.mantissa1); \ + num = (((unsigned long long int) u.ieee.mantissa0) << 32 \ + | u.ieee.mantissa1); \ \ zero_mantissa = num == 0; \ \ @@ -62,7 +64,7 @@ do { \ \ /* We have 3 bits from the mantissa in the leading nibble. \ Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \ - exponent = fpnum.ldbl.ieee.exponent; \ + exponent = u.ieee.exponent; \ \ if (exponent == 0) \ { \ -- cgit 1.4.1