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| author | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-04-03 21:46:05 +0000 |
|---|---|---|
| committer | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-04-03 21:46:05 +0000 |
| commit | 6b6050b229976a2f53184f6d6857e6f445a869d0 (patch) | |
| tree | 3f91e43d68b7aedf1ce51e9da9ff457b47f03ecb /README.txt | |
| parent | d787a41b118a3724d1df87dc3d38cc3fddb3a145 (diff) | |
| download | external_llvm-6b6050b229976a2f53184f6d6857e6f445a869d0.zip external_llvm-6b6050b229976a2f53184f6d6857e6f445a869d0.tar.gz external_llvm-6b6050b229976a2f53184f6d6857e6f445a869d0.tar.bz2 | |
X86 cost model: Vector shifts are expensive in most cases
The default logic does not correctly identify costs of casts because they are
marked as custom on x86.
For some cases, where the shift amount is a scalar we would be able to generate
better code. Unfortunately, when this is the case the value (the splat) will get
hoisted out of the loop, thereby making it invisible to ISel.
radar://13130673
radar://13537826
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178703 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'README.txt')
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