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a69c448a2d
Cost-modeling decisions are tied to the compute interleave groups (widening decisions, scalar and uniform values). When invalidating the interleave groups, those decisions also need to be invalidated. Otherwise there is a mis-match during VPlan construction. VPWidenMemoryRecipes created initially are left around w/o converting them into VPInterleave recipes. Such a conversion indeed should not take place, and these gather/scatter recipes may in fact be right. The crux is leaving around obsolete CM_Interleave (and dependent) markings of instructions along with their costs, instead of recalculating decisions, costs, and recipes. Alternatively to forcing a complete recompute later on, we could try to selectively invalidate the decisions connected to the interleave groups. But we would likely need to run the uniform/scalar value detection parts again anyways and the extra complexity is probably not worth it. Fixes PR45572. Reviewers: gilr, rengolin, Ayal, hsaito Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D78298 |
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