[llvm] [AArch64] Adjust costs for masked CompressStore and ExpandLoad (PR #226950)

[Jack Styles via llvm-commits]

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@@ -5563,7 +5563,13 @@ AArch64TTIImpl::getMaskedMemoryOpCost(const MemIntrinsicCostAttributes &MICA,
       return InstructionCost::getInvalid();
 
     // Operation will be split into expand of masked.load
-    MemOpCost *= 2;
+    // Something like:
+    // cntp x8, p0, p0.s
+    // whilelo p1.s, xzr, x8
+    // ld1w { z1.s }, p1/z, [x0]
+    // expand z1.s, p0, z1.s
+    // mov z0.s, p0/m, z1.s1
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Stylie777 wrote:

Ah I was testing this with a return value which probably caused this. I've removed this comment line.

https://github.com/llvm/llvm-project/pull/226950