[llvm] [AMDGPU] Add IR LiveReg type-based optimization (PR #66838)
Jeffrey Byrnes via llvm-commits
llvm-commits at lists.llvm.org
Fri Apr 19 11:07:54 PDT 2024
================
@@ -369,9 +450,269 @@ bool AMDGPUCodeGenPrepareImpl::run(Function &F) {
}
}
}
+
+ // GlobalISel should directly use the values, and do not need to emit
+ // CopyTo/CopyFrom Regs across blocks
+ if (UsesGlobalISel)
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jrbyrnes wrote:
I thought this was just a consequence of local ISel -- local ISel needs to use CopyTo/FromRegs to propagate values across blocks, and, in this process, legalizes the values.
However, it appears that GlobalISel is doing something similar.
https://github.com/llvm/llvm-project/pull/66838
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