[llvm] b0ea210 - [TTI] Evaluate cost of experimental_widenable_condition as zero

[Max Kazantsev via llvm-commits]

Author: Max Kazantsev
Date: 2023-03-14T17:11:07+07:00
New Revision: b0ea210b351bcb6ac1dc25678e546fd55cf952d8

URL: https://github.com/llvm/llvm-project/commit/b0ea210b351bcb6ac1dc25678e546fd55cf952d8
DIFF: https://github.com/llvm/llvm-project/commit/b0ea210b351bcb6ac1dc25678e546fd55cf952d8.diff

LOG: [TTI] Evaluate cost of experimental_widenable_condition as zero

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

Differential Revision: https://reviews.llvm.org/D146027
Reviewed By: skatkov

Added: 
    

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

Removed: 
    


################################################################################
diff  --git a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
index 649b781035e7..7ebfa054818b 100644
--- a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -681,6 +681,7 @@ class TargetTransformInfoImplBase {
     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;
     }

diff  --git a/llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll b/llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll
index 542f73a9b1c8..37f5e3a8649d 100644
--- a/llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll
+++ b/llvm/test/Transforms/LoopUnroll/guard-cost-for-unrolling.ll
@@ -30,8 +30,8 @@ exit:
 
 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