diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/fpu/s_llroundf.c')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/fpu/s_llroundf.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/sysdeps/powerpc/powerpc32/fpu/s_llroundf.c b/sysdeps/powerpc/powerpc32/fpu/s_llroundf.c index 8ce4b26191..6c67857ec5 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_llroundf.c +++ b/sysdeps/powerpc/powerpc32/fpu/s_llroundf.c @@ -17,6 +17,8 @@ <http://www.gnu.org/licenses/>. */ #include <math.h> +#include <math_private.h> +#include <stdint.h> /* Round to the nearest integer, with values exactly on a 0.5 boundary rounded away from zero, regardless of the current rounding mode. @@ -26,7 +28,33 @@ long long int __llroundf (float x) { - long long xr = (long long) x; + long long xr; + if (HAVE_PPC_FCTIDZ) + xr = (long long) x; + else + { + float ax = fabsf (x); + /* Avoid incorrect exceptions from libgcc conversions (as of GCC + 5): <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59412>. */ + if (ax < 0x1p31f) + xr = (long long int) (long int) x; + else if (!(ax < 0x1p55f)) + xr = (long long int) (long int) (x * 0x1p-32f) << 32; + else + { + uint32_t i0; + GET_FLOAT_WORD (i0, x); + int exponent = ((i0 >> 23) & 0xff) - 0x7f; + unsigned long long int mant = (i0 & 0x7fffff) | 0x800000; + mant <<= exponent - 23; + xr = (long long int) ((i0 & 0x80000000) != 0 ? -mant : mant); + } + } + /* Avoid spurious "inexact" converting LLONG_MAX to float, and from + subtraction when the result is out of range, by returning early + for arguments large enough that no rounding is needed. */ + if (!(fabsf (x) < 0x1p23f)) + return xr; float xrf = (float) xr; if (x >= 0.0) |