| commit | 60c414c346a1d5ef0510ffbdc0ab75f288ee4d3f | |
| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | |
| Fri, 29 Mar 2013 23:15:28 +0000 (29 18:15 -0500) | ||
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | |
| Mon, 1 Apr 2013 11:36:51 +0000 (1 06:36 -0500) | ||
| tree | 479eb937a9496619acfb24db9a6a48831f9c3fb3 | treesnapshot (tar.gz zip) |
| parent | 6142896d53d0e8e8abe5dd0494380c45acc1a919 | commitdiff |
PowerPC: remove branch prediction from rint implementation
The branch prediction hints is actually hurts performance in this case.
The assembly implementation make two assumptions: 1. 'fabs (x) < 2^52'
is unlikely and 2. 'x > 0.0' is unlike (if 1. is true). Since it a
general floating point function, expected input is not bounded and then
it is better to let the hardware handle the branches.
The branch prediction hints is actually hurts performance in this case.
The assembly implementation make two assumptions: 1. 'fabs (x) < 2^52'
is unlikely and 2. 'x > 0.0' is unlike (if 1. is true). Since it a
general floating point function, expected input is not bounded and then
it is better to let the hardware handle the branches.