zhijian lin bf79d4819e [Reland] [PowerPC] frontend get target feature from backend with cpu name (#144594) ...

1. The PR proceeds with a backend target hook to allow front-ends to
determine what target features are available in a compilation based on
the CPU name.
2. Fix a backend target feature bug that supports HTM for
Power8/9/10/11. However, HTM is only supported on Power8/9 according to
the ISA.
3. All target features that are hardcoded in PPC.cpp can be retrieved
from the backend target feature. I have double-checked that the
hardcoded logic for inferring target features from the CPU in the
frontend(PPC.cpp) is the same as in PPC.td.

The reland patch addressed the comment
https://github.com/llvm/llvm-project/pull/137670#discussion_r2143541120

2025-06-19 09:22:16 -04:00

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