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b333356046
Summary: 1. gcc uses `-march` and `-mtune` flag to chose arch and pipeline model, but clang does not have `-mtune` flag, we uses `-mcpu` to chose both infos. 2. Add SiFive e31 and u54 cpu which have default march and pipeline model. 3. Specific `-mcpu` with rocket-rv[32|64] would select pipeline model only, and use the driver's arch choosing logic to get default arch. Reviewers: lenary, asb, evandro, HsiangKai Reviewed By: lenary, asb, evandro Tags: #llvm, #clang Differential Revision: https://reviews.llvm.org/D71124 (cherry picked from commit 294d1eae75bf8867821a4491f0d67445227f8470) |
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