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If we don't immediately lower the vector shift, the splat constant vector we created may get turned into a constant pool load before we get around to lowering the shift. This makes it a lot more difficult to create a shift by constant. Sometimes we fail to see through the constant pool at all and end up trying to lower as if it was a variable shift. This requires custom handling and may create an unsupported vselect on pre-sse-4.1 targets. Since we're after LegalizeVectorOps we are unable to legalize the unsupported vselect as that code is in LegalizeVectorOps rather than LegalizeDAG. So calling LowerShift immediately ensures that we get see the splat constant. Fixes PR46527. Differential Revision: https://reviews.llvm.org/D83455 |
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