[llvm] [Mips] Support llvm.readcyclecounter intrinsic (PR #114953)

[YunQiang Su via llvm-commits]

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+;RUN: llc -mtriple=mipsel-linux-gnu -mcpu=mips32r2 < %s | FileCheck %s --check-prefix=MIPSEL
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wzssyqa wrote:

What will happen for pre-r2 or non Linux?

https://github.com/llvm/llvm-project/pull/114953