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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27758 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2006-04-17 17:29:41 +00:00
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10
lib/Target/PowerPC/README_ALTIVEC.txt
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@ -110,3 +110,13 @@ vec_ste(&destloc,0,vTemp);
We can do an arbitrary non-constant value by using lvsr/perm/ste.
//===----------------------------------------------------------------------===//
If we want to tie instruction selection into the scheduler, we can do some
constant formation with different instructions. For example, we can generate
"vsplti -1" with "vcmpequw R,R" and 1,1,1,1 with "vsubcuw R,R", both of which
use different execution units, thus could help scheduling.
This is probably only reasonable for a post-pass scheduler.
//===----------------------------------------------------------------------===//