[PATCH] D44367: [InstCombine] peek through FP casts for sign-bit compares (PR36682)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In the mean time i experimented with generating the testcases (clearly, overdone it), and this patch does not handle all the cases i've come up with. Or maybe the cases are just invalid, which is more likely.

F5886407: cast-int-icmp-eq-0.ll <https://reviews.llvm.org/F5886407> (with this patch)

Generated with:

  /tmp$ clang++ bitcast.cpp
  /build/llvm/test/Transforms/InstCombine$ /tmp/a.out > cast-int-icmp-eq-0.ll; /build/llvm/utils/update_test_checks.py --opt=/build/llvm-build-Clang-release/bin/opt cast-int-icmp-eq-0.ll

F5886408: bitcast.cpp <https://reviews.llvm.org/F5886408>


https://reviews.llvm.org/D44367