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dc219dddde
This patch fixes bugs that were exposed by the addition of fast-math-flags in the DAG: r237046 ( http://reviews.llvm.org/rL237046 ): 1. When replacing a division node, it's not enough to RAUW. We should call CombineTo() to delete dead nodes and combine again. 2. Because we are changing the DAG, we can't return an empty SDValue after the transform. As the code comments say: Visitation implementation - Implement dag node combining for different node types. The semantics are as follows: Return Value: SDValue.getNode() == 0 - No change was made SDValue.getNode() == N - N was replaced, is dead and has been handled. otherwise - N should be replaced by the returned Operand. The new test case shows no difference with or without this patch, but it will crash if we re-apply r237046 or enable FMF via the current -enable-fmf-dag cl::opt. Differential Revision: http://reviews.llvm.org/D9893 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241826 91177308-0d34-0410-b5e6-96231b3b80d8 |
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