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------------------------------------------------------------------------ r292188 | ab | 2017-01-16 22:10:02 -0500 (Mon, 16 Jan 2017) | 11 lines [TLI] Add prototype checking for all remaining LibFuncs. This is another step towards unifying all LibFunc prototype checks. This work started in r267758 (D19469); add the remaining checks. Also add a unittest that checks each libfunc declared with a known-valid and known-invalid prototype. New libfuncs added in the future are required to have prototype checking in place; the known-valid test will fail otherwise. Differential Revision: https://reviews.llvm.org/D28030 ------------------------------------------------------------------------ This ports just the fix for the log1p LibFunc to fix a crash on FreeBSD. See PR32494 and PR32495. git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_40@303992 91177308-0d34-0410-b5e6-96231b3b80d8
Analysis Opportunities:
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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))
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