[PATCH] D70079: [SelectionDAG] Combine U{ADD,SUB}O diamonds into {ADD,SUB}CARRY
David Zarzycki via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Nov 20 05:12:49 PST 2019
davezarzycki updated this revision to Diff 230237.
davezarzycki marked 5 inline comments as done.
davezarzycki added a comment.
1. Prettier ASCII art.
2. Add robustness against the carry in bit swapping positions during optimization passes.
3. Dropped use-once checks on the first uaddo/usubo node.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D70079/new/
https://reviews.llvm.org/D70079
Files:
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
test/CodeGen/X86/addcarry.ll
test/CodeGen/X86/subcarry.ll
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