[PATCH] D100002: [CSSPGO] Move pseudo probes to the beginning of a block to unblock SelectionDAG combine.

[Wei Mi via Phabricator via llvm-commits]

wmi added inline comments.


================
Comment at: llvm/lib/CodeGen/CodeGenPrepare.cpp:8004-8005
+    auto FirstInst = Block.getFirstInsertionPt();
+    while (FirstInst != Block.end() && FirstInst->isDebugOrPseudoInst())
+      ++FirstInst;
+    BasicBlock::iterator I(FirstInst);
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Why pseudo probes need to be put after debug instructions on the top, is it necessary? 


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D100002/new/

https://reviews.llvm.org/D100002