[InstCombine] Simplify and correct folding fcmps with the same children
Summary: Take advantage of FCmpInst::Predicate's bit pattern and handle (fcmp *, x, y) | (fcmp *, x, y) and (fcmp *, x, y) & (fcmp *, x, y) more consistently. Also fold more FCmpInst::FCMP_FALSE and FCmpInst::FCMP_TRUE to constants.
Currently InstCombine wrongly folds (fcmp ogt, x, y) | (fcmp ord, x, y) to (fcmp ogt, x, y); this patch also fixes that.
Reviewers: spatel
Subscribers: llvm-commits, iteratee, echristo
Differential Revision: http://reviews.llvm.org/D21775
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274156 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed