[PATCH] [SelectionDAG] Unary vector constant folding integer legality fixes
llvm-dev at redking.me.uk
Sun Apr 26 07:29:02 PDT 2015
Hi resistor, qcolombet, patrik.h.hagglund,
This patch fixes issues with vector constant folding not correctly handling scalar input operands if they require implicit truncation - this was tested with llvm-stress as recommended by Patrik.
The patch ensures that integer input scalars from a build vector are correctly truncated before folding, and that constant integer scalar results are promoted to a legal type before inclusion in the new folded build vector. I've ran llvm-stress for extended lengths of time without any issue due to the vector constant folding path.
I have added another crash test case and also a test for UINT_TO_FP / SINT_TO_FP using an non-truncated scalar input, which was failing before this patch.
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