[PATCH] D30390: [X86] Use APInt instead of SmallBitVector for tracking Zeroable elements in shuffle lowering

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.

SmallBitVector uses a malloc for more than 58 bits on a 64-bit target and more than 27 bits on a 32-bit target. Some of the vector types we deal with here use more than those number of elements and therefore cause a malloc.

APInt on the other hand supports up to 64 bits without a malloc. That's the maximum number of bits we need here so we can avoid a malloc for all cases by using APInt.


https://reviews.llvm.org/D30390

Files:
  lib/Target/X86/X86ISelLowering.cpp

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