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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-03-31 13:54:09 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-03-31 13:54:09 +0000 |
| commit | 3c81c34d8d8a5f9e9abde0fcfedce91dc1d09156 (patch) | |
| tree | a72d5ca9822304fc7a3bc8c7ba48b23a2ae39a25 /llvm/lib/CodeGen/MachineBasicBlock.cpp | |
| parent | 60088c3ff67e6fab8192cd670e2185d855ead749 (diff) | |
| download | llvm-3c81c34d8d8a5f9e9abde0fcfedce91dc1d09156.zip llvm-3c81c34d8d8a5f9e9abde0fcfedce91dc1d09156.tar.gz llvm-3c81c34d8d8a5f9e9abde0fcfedce91dc1d09156.tar.bz2 | |
[DAGCombiner] Add vector demanded elements support to ComputeNumSignBits
Currently ComputeNumSignBits returns the minimum number of sign bits for all elements of vector data, when we may only be interested in one/some of the elements.
This patch adds a DemandedElts argument that allows us to specify the elements we actually care about. The original ComputeNumSignBits implementation calls with a DemandedElts demanding all elements to match current behaviour. Scalar types set this to 1.
I've only added support for BUILD_VECTOR and EXTRACT_VECTOR_ELT so far, all others will default to demanding all elements but can be updated in due course.
Followup to D25691.
Differential Revision: https://reviews.llvm.org/D31311
llvm-svn: 299219
Diffstat (limited to 'llvm/lib/CodeGen/MachineBasicBlock.cpp')
0 files changed, 0 insertions, 0 deletions