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Mirror of https://github.com/RPCS3/llvm-mirror
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This patch fixes up one case where the fixed-length-vector VL was dropped (falling back to VLMAX) when inserting vector elements, as the code would lower via ISD::INSERT_VECTOR_ELT (at index 0) which loses the fixed-length vector information. To this end, a custom node, VMV_S_XF_VL, was introduced to carry the VL operand through to the final instruction. This node wraps the RVV vmv.s.x and vmv.s.f instructions, which were being selected by insert_vector_elt anyway. There should be no observable difference in scalable-vector codegen. There is still one outstanding drop from fixed-length VL to VLMAX, when an i64 element is inserted into a vector on RV32; the splat (which is custom legalized) has no notion of the original fixed-length vector type. Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D97842 |
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