Changes in directory llvm/lib/Target/PowerPC:
README_ALTIVEC.txt updated: 1.25 -> 1.26 --- Log message: add a note --- Diffs of the changes: (+10 -0) README_ALTIVEC.txt | 10 ++++++++++ 1 files changed, 10 insertions(+) Index: llvm/lib/Target/PowerPC/README_ALTIVEC.txt diff -u llvm/lib/Target/PowerPC/README_ALTIVEC.txt:1.25 llvm/lib/Target/PowerPC/README_ALTIVEC.txt:1.26 --- llvm/lib/Target/PowerPC/README_ALTIVEC.txt:1.25 Mon Apr 17 00:28:54 2006 +++ llvm/lib/Target/PowerPC/README_ALTIVEC.txt Mon Apr 17 12:29:41 2006 @@ -110,3 +110,13 @@ 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. + +//===----------------------------------------------------------------------===// + _______________________________________________ llvm-commits mailing list llvm-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
