Florian Hahn b4dbb1cdc4
[VPlan] Be more careful with CSE in replicate regions. (#162110)
Recipes in replicate regions implicitly depend on the region's
predicate. Limit CSE to recipes in the same block, when either recipe is
in a replicate region.

This allows handling VPPredInstPHIRecipe during CSE. If we perform CSE
on recipes inside a replicate region, we may end up with 2
VPPredInstPHIRecipes sharing the same operand. This is incompatible with
current VPPredInstPHIRecipe codegen, which re-sets the current value of
its operand in VPTransformState. This can cause crashes in the added
test cases.

Note that this patch only modifies ::isEqual to check for replicating
regions and not getHash, as CSE across replicating regions should be
uncommon.

Fixes https://github.com/llvm/llvm-project/issues/157314. 
Fixes https://github.com/llvm/llvm-project/issues/161974.

PR: https://github.com/llvm/llvm-project/pull/162110
2025-10-20 10:53:47 +00:00
..