[PATCH] D102344: [SCEV]: Teach SCEV about llvm.annotation intrinsic

[Ettore Tiotto via Phabricator via llvm-commits]

etiotto created this revision.
etiotto added reviewers: Whitney, bmahjour, reames, Meinersbur.
Herald added subscribers: javed.absar, hiraditya.
etiotto requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

The `llvm.annotation` intrinsic returns the first argument passed to it (https://llvm.org/docs/LangRef.html). This patch 'teaches' SCEV to the semantics of that builtin function.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102344

Files:
  llvm/lib/Analysis/ScalarEvolution.cpp


Index: llvm/lib/Analysis/ScalarEvolution.cpp
===================================================================
--- llvm/lib/Analysis/ScalarEvolution.cpp
+++ llvm/lib/Analysis/ScalarEvolution.cpp
@@ -6910,8 +6910,8 @@
         return getAddExpr(ClampedX, Y, SCEV::FlagNUW);
       }
       case Intrinsic::start_loop_iterations:
-        // A start_loop_iterations is just equivalent to the first operand for
-        // SCEV purposes.
+      case Intrinsic::annotation:
+        // Equivalent to the first operand for SCEV purposes.
         return getSCEV(II->getArgOperand(0));
       default:
         break;


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