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lround: provide cast for wordsize-64 version if needed

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Platforms with 64-bit registers where 32-bit values need to have the
high 32 bits set in a particular way need to have an explicit cast
when using the 64-bit sysdeps/ieee754/dbl-64/wordsize-64 version
of llround() as lround().  This includes tilegx32, and likely MIPS.
x32 does not need this, and AArch64 ILP32 will not either.  Require
it to be specified in sysdep.h to be explicit.
This commit is contained in:
Chris Metcalf 2015-01-05 11:59:32 -05:00
parent ab70da77ea
commit 1dca195e1c
4 changed files with 43 additions and 10 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2015-01-05 Chris Metcalf <cmetcalf@ezchip.com>
* sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c [!defined _LP64
&& REGISTER_CAST_INT32_TO_INT64]: Provide explicit lround()
function with cast from llround().
* sysdeps/tile/sysdep.h (REGISTER_CAST_INT32_TO_INT64): Define.
* sysdeps/x86_64/x32/sysdep.h (REGISTER_CAST_INT32_TO_INT64):
Define.
2015-01-05 Joseph Myers <joseph@codesourcery.com>
[BZ #17793]

36
sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c
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@ -21,6 +21,7 @@
#define __lround __hidden___lround
#include <math.h>
#include <sysdep.h>
#include <math_private.h>
@ -64,16 +65,31 @@ __llround (double x)
weak_alias (__llround, llround)
#ifdef NO_LONG_DOUBLE
strong_alias (__llround, __lroundl)
weak_alias (__llround, lroundl)
#endif
/* long has the same width as long long on 64-bit machines. */
#undef lround
#undef __lround
strong_alias (__llround, __lround)
weak_alias (__llround, lround)
#ifdef NO_LONG_DOUBLE
strong_alias (__llround, __llroundl)
weak_alias (__llround, llroundl)
#endif
/* long has the same width as long long on LP64 machines, so use an alias.
If building for ILP32 on a machine with 64-bit registers, however,
use a cast if necessary. */
#undef lround
#undef __lround
#if !defined (_LP64) && REGISTER_CAST_INT32_TO_INT64
long int
__lround (double x)
{
return __llround (x);
}
weak_alias (__lround, lround)
# ifdef NO_LONG_DOUBLE
strong_alias (__lround, __lroundl)
weak_alias (__lround, lroundl)
# endif
#else
strong_alias (__llround, __lround)
weak_alias (__llround, lround)
# ifdef NO_LONG_DOUBLE
strong_alias (__llround, __lroundl)
weak_alias (__llround, lroundl)
# endif
#endif

4
sysdeps/tile/sysdep.h
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@ -108,3 +108,7 @@
#endif
#endif /* __ASSEMBLER__ */
/* On tilegx, 32-bit values must have their high 32 bits sign extended;
random values are not allowed. */
#define REGISTER_CAST_INT32_TO_INT64 1

4
sysdeps/x86_64/x32/sysdep.h
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@ -90,3 +90,7 @@
# define R15_LP "r15d"
#endif /* __ASSEMBLER__ */
/* On x32, it is not required to normalize a 64-bit value before using
it as a 32-bit value. */
#define REGISTER_CAST_INT32_TO_INT64 0