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...instructions, while i64 instructions have to be emulated with i32 instructions. This means that G_LOAD should be custom legalized for s64 integer value, and be legal for s64 floating point value. There are also other generic instructions with the same problem: G_STORE, G_SELECT, G_EXTRACT, and G_INSERT. There are also other configurations where integer and floating point instructions of the same size are not simultaneously available. This problem was already addressed here http://lists.llvm.org/pipermail/llvm-dev/2017-July/114978.html for G_LOAD/G_STORE. Legality of an instruction should no...

Hi, I’m trying to handle some vector operations with splitting/scalarization and keep running into similar sorts of issues which are making me question the intended function of the various legalization operations (particularly G_MERGE_VALUES/G_UNMERGE_VALUES, but also G_EXTRACT/G_INSERT and conversion instructions) and what the contract between the legalizer and selector actually is. For scalar values, things seem clearer, but I’m still confused. The AArch64 selector code seems content to allow strange sized values in the source of G_EXTRACT/G_SEXT etc, and then just set the regi...