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| author | Alan Modra <amodra@gmail.com> | 2013-08-17 18:21:58 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2013-10-04 10:31:41 +0930 |
| commit | 1b6adf888de14675bc3207578dcb7132ed5f8ecc (patch) | |
| tree | d3f1bc0076f24429772ea316b624fcc5bf7bebd8 /sysdeps | |
| parent | 4cf69995e26e16005d4e3843ad4d18c75cf21a04 (diff) | |
| download | glibc-1b6adf888de14675bc3207578dcb7132ed5f8ecc.zip glibc-1b6adf888de14675bc3207578dcb7132ed5f8ecc.tar.gz glibc-1b6adf888de14675bc3207578dcb7132ed5f8ecc.tar.bz2 | |
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.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/printf_fphex.c | 14 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/printf_fphex.c | 4 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-96/printf_fphex.c | 8 | ||||
| -rw-r--r-- | sysdeps/x86_64/fpu/printf_fphex.c | 9 |
4 files changed, 20 insertions, 15 deletions
diff --git a/sysdeps/ieee754/ldbl-128/printf_fphex.c b/sysdeps/ieee754/ldbl-128/printf_fphex.c index c9e09a4..e82228a 100644 --- a/sysdeps/ieee754/ldbl-128/printf_fphex.c +++ b/sysdeps/ieee754/ldbl-128/printf_fphex.c @@ -24,13 +24,15 @@ do { \ digits we use only the implicit digits for the number before \ the decimal point. */ \ unsigned long long int num0, num1; \ + union ieee854_long_double u; \ + u.d = fpnum.ldbl; \ \ assert (sizeof (long double) == 16); \ \ - num0 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32 \ - | fpnum.ldbl.ieee.mantissa1); \ - num1 = (((unsigned long long int) fpnum.ldbl.ieee.mantissa2) << 32 \ - | fpnum.ldbl.ieee.mantissa3); \ + num0 = (((unsigned long long int) u.ieee.mantissa0) << 32 \ + | u.ieee.mantissa1); \ + num1 = (((unsigned long long int) u.ieee.mantissa2) << 32 \ + | u.ieee.mantissa3); \ \ zero_mantissa = (num0|num1) == 0; \ \ @@ -75,9 +77,9 @@ do { \ *--wnumstr = L'0'; \ } \ \ - leading = fpnum.ldbl.ieee.exponent == 0 ? '0' : '1'; \ + leading = u.ieee.exponent == 0 ? '0' : '1'; \ \ - exponent = fpnum.ldbl.ieee.exponent; \ + exponent = u.ieee.exponent; \ \ if (exponent == 0) \ { \ diff --git a/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c b/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c index 453c2be..e0ec422 100644 --- a/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c +++ b/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c @@ -27,14 +27,14 @@ do { \ unsigned long long hi, lo; \ int ediff; \ union ibm_extended_long_double u; \ - u.ld = fpnum.ldbl.d; \ + u.ld = fpnum.ldbl; \ \ assert (sizeof (long double) == 16); \ \ lo = ((long long)u.d[1].ieee.mantissa0 << 32) | u.d[1].ieee.mantissa1; \ hi = ((long long)u.d[0].ieee.mantissa0 << 32) | u.d[0].ieee.mantissa1; \ lo <<= 7; /* pre-shift lo to match ieee854. */ \ - /* If the lower double is not a denomal or zero then set the hidden \ + /* If the lower double is not a denormal or zero then set the hidden \ 53rd bit. */ \ if (u.d[1].ieee.exponent != 0) \ lo |= (1ULL << (52 + 7)); \ diff --git a/sysdeps/ieee754/ldbl-96/printf_fphex.c b/sysdeps/ieee754/ldbl-96/printf_fphex.c index f356a48..715c93b 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) \ { \ diff --git a/sysdeps/x86_64/fpu/printf_fphex.c b/sysdeps/x86_64/fpu/printf_fphex.c index c85d1f7..be55f9c 100644 --- a/sysdeps/x86_64/fpu/printf_fphex.c +++ b/sysdeps/x86_64/fpu/printf_fphex.c @@ -25,10 +25,11 @@ 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; \ \ - \ - 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; \ \ @@ -61,7 +62,7 @@ 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) \ { \ |