[llvm-commits] patch: partial dse

[Duncan Sands]

Hi Nick,

> Is this (N+7)/8 logic codified somewhere outside of TargetData? It'd be 
> useful to know how many bits the i6* will really modify even when 
> targetdata isn't available, but I don't want to scatter the assumptions 
> everywhere, making it difficult to port LLVM to the PDP-11 some day.

it is really (N + BITS_IN_A_UNIT-1)/BITS_IN_A_UNIT, where a unit is the
smallest addressable number of bits, typically 8.  As such it is target
dependent, though currently all targets use "8", so can't really be used
without target data :(

Ciao,

Duncan.