================
@@ -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);
----------------
nikic wrote:
In terms of ordering, I think it would make the most sense to do this between
sinkRegion and hoistRegion above.
Anything that gets hoisted out by hoistRegion cannot be sunk, otherwise
sinkRegion would have already done it. So there is no need to check the hoisted
instructions for sinking again.
https://github.com/llvm/llvm-project/pull/157559
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