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The current pattern for extract bits in range is typically: Mask.lshr(BitOffset).trunc(SubSizeInBits); Which can be particularly slow for large APInts (MaskSizeInBits > 64) as they require the allocation of memory for the temporary variable. This is another of the compile time issues identified in PR32037 (see also D30265). This patch adds the APInt::extractBits() helper method which avoids the temporary memory allocation. Differential Revision: https://reviews.llvm.org/D30336 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296272 91177308-0d34-0410-b5e6-96231b3b80d8
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