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------------------------------------------------------------------------ r311835 | dhinton | 2017-08-26 14:08:51 -0700 (Sat, 26 Aug 2017) | 12 lines [Dominators] Remove redundant explicit template instantiation. Summary: Remove redundant explicit template instantiation. This was reported by Andrew Kelley building release_50 with gcc7.2.0 on MacOS: duplicate symbol llvm::DominatorTreeBase. Reviewers: kuhar, andrewrk, davide, hans Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D37185 ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@312014 91177308-0d34-0410-b5e6-96231b3b80d8
Analysis Opportunities:
//===---------------------------------------------------------------------===//
In test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll, the
ScalarEvolution expression for %r is this:
{1,+,3,+,2}<loop>
Outside the loop, this could be evaluated simply as (%n * %n), however
ScalarEvolution currently evaluates it as
(-2 + (2 * (trunc i65 (((zext i64 (-2 + %n) to i65) * (zext i64 (-1 + %n) to i65)) /u 2) to i64)) + (3 * %n))
In addition to being much more complicated, it involves i65 arithmetic,
which is very inefficient when expanded into code.
//===---------------------------------------------------------------------===//
In formatValue in test/CodeGen/X86/lsr-delayed-fold.ll,
ScalarEvolution is forming this expression:
((trunc i64 (-1 * %arg5) to i32) + (trunc i64 %arg5 to i32) + (-1 * (trunc i64 undef to i32)))
This could be folded to
(-1 * (trunc i64 undef to i32))
//===---------------------------------------------------------------------===//