commit	bec15b6516466a1f3eeb2a52e5584b5d4f5b713e	[log] [tgz]
author	Craig Topper <craig.topper@intel.com>	Wed Aug 22 23:27:50 2018 +0000
committer	Craig Topper <craig.topper@intel.com>	Wed Aug 22 23:27:50 2018 +0000
tree	67c86d1ebe8b3b72c392fc6bf98a15596e7456c5
parent	2b3900643364f568c2308b178a30e8926b779c70 [diff]

[ValueTracking] Teach computeNumSignBits to understand min/max clamp patterns with constant/splat values

If we have a min/max pair we can do a better job of counting sign bits if we look at them together. This is similar to what is done in the SelectionDAG version of computeNumSignBits for ISD::SMAX/SMIN.

Differential Revision: https://reviews.llvm.org/D51112

llvm-svn: 340480

llvm/lib/Analysis/ValueTracking.cpp[diff]
llvm/test/Transforms/InstCombine/max_known_bits.ll[diff]

2 files changed

tree: 67c86d1ebe8b3b72c392fc6bf98a15596e7456c5

clang/
clang-tools-extra/
compiler-rt/
debuginfo-tests/
libclc/
libcxx/
libcxxabi/
libunwind/
lld/
lldb/
llgo/
llvm/
openmp/
parallel-libs/
polly/
README.md

README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.