Philip Reames 7d4d59cf8a
[RS4GC] Avoid crashing on gep scalar_base, vector_idx ...
This is an alternative to https://reviews.llvm.org/D57103 . After discussion, we dedicided to check this in as a temporary workaround, and pursue a true fix under the original thread.
The issue at hand is that the base rewriting algorithm doesn't consider the fact that GEPs can turn a scalar input into a vector of outputs. We had handling for scalar GEPs and fully vector GEPs (i.e. all vector operands), but not the scalar-base + vector-index forms. A true fix here requires treating GEP analogously to extractelement or shufflevector.
This patch is merely a workaround. It simply hides the crash at the cost of some ugly code gen for this presumable very rare pattern.
Differential Revision: https://reviews.llvm.org/D57138
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352059 91177308-0d34-0410-b5e6-96231b3b80d8
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Philip Reames
7d4d59cf8a