Matt Pharr 5b20b06bd9 Add avg_{up,down}_int{8,16} routines to stdlib ...

These compute the average of two given values, rounding up and down,
respectively, if the result isn't exact.  When possible, these are
mapped to target-specific intrinsics (PADD[BW] on IA and VH[R]ADD[US]
on NEON.)

A subsequent commit will add pattern-matching to generate calls to
these intrinsincs when the corresponding patterns are detected in the
IR.)

2013-08-06 08:41:12 -07:00

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