[PATCH] propagate IR-level fast-math-flags to DAG nodes

Tue May 12 10:00:22 PDT 2015

For the record, r236546 was reverted by:
http://reviews.llvm.org/rL236600

The bug is independent of FMF or the other flags. It can be reproduced by allocating a plain SDNode for any instruction with 2 operands rather than a BinarySDNode. The bug manifests (visible under valgrind) after recycling the operand memory and/or morphing a node.

I didn't take any perf measurements, but I assume that we want to continue using the specialized operand classes (UnarySDNode, BinarySDNode, TernarySDNode) for their allocation optimizations. So I simplified this patch to keep the existing BinaryWithFlagsSDNode class that derives from BinarySDNode: 
http://reviews.llvm.org/rL237046

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8900

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