[X86] Always use rip-relative addressing on 64-bit when rematerializing all...
[X86] Always use rip-relative addressing on 64-bit when rematerializing all zeros/ones registers using a folded load. Previously we only used RIP relative when PIC was enabled. But we know we're in small/kernel code model here so we should be able to always use RIP-relative which will give a smaller encoding. Here's a godbolt link that demonstrates the current codegen https://godbolt.org/z/j3158o Note in the non-PIC version the load from .LCPI0_0 doesn't use RIP-relative addressing, but if you change the constant in the source from 0.0 to 1.0 it will become RIP-relative. Reviewed By: RKSimon Differential Revision: https://reviews.llvm.org/D97208
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