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3 Commits

Author SHA1 Message Date
Qiu Chaofan 87c773082a [PowerPC] Exploit VSX rounding instrs for rint 
Exploit native VSX rounding instruction, x(v|s)r(d|s)pic, which does
rounding using current rounding mode.

According to C standard library, rint may raise INEXACT exception while
nearbyint won't.

Reviewed By: lkail

Differential Revision: https://reviews.llvm.org/D72685
 2020-02-13 20:59:50 +08:00
Nemanja Ivanovic 781b78a361 [PowerPC] Only legalize FNEARBYINT with unsafe fp math 
Commit 0f0330a787 legalized these nodes on PPC without consideration of
unsafe math which means that we get inexact exceptions raised for nearbyint.
Since this doesn't conform to the standard, switch this legalization to depend
on unsafe fp math.
 2020-01-02 13:45:54 -06:00
Nemanja Ivanovic 0f0330a787 [PowerPC] Legalize rounding nodes 
VSX provides a full complement of rounding instructions yet we somehow ended up
with some of them legal and others not. This just legalizes all of the FP
rounding nodes and the FP -> int rounding nodes with unsafe math.

Differential revision: https://reviews.llvm.org/D69949
 2019-12-30 08:03:53 -06:00