[clang] [llvm] [LICM] Sink unused l-invariant loads in preheader. (PR #157559)

[Sirish Pande via llvm-commits]

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@@ -545,11 +551,18 @@ bool LoopInvariantCodeMotion::runOnLoop(Loop *L, AAResults *AA, LoopInfo *LI,
   assert((L->isOutermost() || L->getParentLoop()->isLCSSAForm(*DT)) &&
          "Parent loop not left in LCSSA form after LICM!");
 
+  // sink pre-header defs that are unused in-loop into the unique exit to reduce
+  // pressure.
+  Flags.setIsSink(true);
+  Changed |= sinkUnusedInvariantsFromPreheaderToExit(L, AA, &SafetyInfo, MSSAU,
+                                                     SE, DT, Flags, ORE);
+
   if (VerifyMemorySSA)
     MSSA->verifyMemorySSA();
 
   if (Changed && SE)
     SE->forgetLoopDispositions();
+
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srpande wrote:

no need for new line.

https://github.com/llvm/llvm-project/pull/157559