[PATCH] D146027: [TTI] Evaluate cost of experimental_widenable_condition as zero

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.
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This intrinsic is not supposed to live through lowering, eventually it should turn
into `true` constant and be optimized away.


https://reviews.llvm.org/D146027

Files:
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll


Index: llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll
===================================================================
--- llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll
+++ llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll
@@ -30,8 +30,8 @@
 
 define void @test_guard_as_branch(ptr %arr, i64 %n, i64 %bound) {
 ; CHECK-LABEL: Loop Unroll: F[test_guard_as_branch] Loop %loop
-; CHECK-NEXT:    Loop Size = 10
-; CHECK-NEXT:    runtime unrolling with count: 1
+; CHECK-NEXT:    Loop Size = 9
+; CHECK-NEXT:    runtime unrolling with count: 2
 entry:
   br label %loop
 
Index: llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
===================================================================
--- llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -681,6 +681,7 @@
     case Intrinsic::coro_suspend:
     case Intrinsic::coro_subfn_addr:
     case Intrinsic::threadlocal_address:
+    case Intrinsic::experimental_widenable_condition:
       // These intrinsics don't actually represent code after lowering.
       return 0;
     }


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