Ahmed Bougacha
67297cd956
[ARM] Enable vector extload combine for legal types.
...
This commit enables forming vector extloads for ARM.
It only does so for legal types, and when we can't fold the extension
in a wide/long form of the user instruction.
Enabling it for larger types isn't as good an idea on ARM as it is on
X86, because:
- we pretend that extloads are legal, but end up generating vld+vmov
- we have instructions like vld {dN, dM}, which can't be generated
when we "manually expand" extloads to vld+vmov.
For legal types, the combine doesn't fire that often: in the
integration tests only in a big endian testcase, where it removes a
pointless AND.
Related to rdar://19723053
Differential Revision: http://reviews.llvm.org/D7423
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231396 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-05 19:37:53 +00:00
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