[llvm] 1e16a35 - [ValueTracking] Implement `isKnownNonZero` for `llvm.vector.reduce.or`

[Noah Goldstein via llvm-commits]

Author: Noah Goldstein
Date: 2024-04-14T22:49:06-05:00
New Revision: 1e16a35fbcc6b21d1bee597c7e76f2444b7000e5

URL: https://github.com/llvm/llvm-project/commit/1e16a35fbcc6b21d1bee597c7e76f2444b7000e5
DIFF: https://github.com/llvm/llvm-project/commit/1e16a35fbcc6b21d1bee597c7e76f2444b7000e5.diff

LOG: [ValueTracking] Implement `isKnownNonZero` for `llvm.vector.reduce.or`

Closes #88320

Added: 
    

Modified: 
    llvm/lib/Analysis/ValueTracking.cpp
    llvm/test/Transforms/InstSimplify/known-non-zero.ll

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 378e4aa9974e56..5c2806078261d8 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -2918,7 +2918,8 @@ static bool isKnownNonZeroFromOperator(const Operator *I,
         return isNonZeroAdd(DemandedElts, Depth, Q, BitWidth,
                             II->getArgOperand(0), II->getArgOperand(1),
                             /*NSW=*/true, /* NUW=*/false);
-        // umin/smin/smax/smin of all non-zero elements is always non-zero.
+        // umin/smin/smax/smin/or of all non-zero elements is always non-zero.
+      case Intrinsic::vector_reduce_or:
       case Intrinsic::vector_reduce_umax:
       case Intrinsic::vector_reduce_umin:
       case Intrinsic::vector_reduce_smax:

diff  --git a/llvm/test/Transforms/InstSimplify/known-non-zero.ll b/llvm/test/Transforms/InstSimplify/known-non-zero.ll
index b0b825efaeee29..fd2862eb04a24d 100644
--- a/llvm/test/Transforms/InstSimplify/known-non-zero.ll
+++ b/llvm/test/Transforms/InstSimplify/known-non-zero.ll
@@ -380,10 +380,7 @@ define <2 x i1> @insert_nonzero_any_idx_fail(<2 x i8> %xx, i8 %yy, i32 %idx) {
 
 define i1 @nonzero_reduce_or(<2 x i8> %xx) {
 ; CHECK-LABEL: @nonzero_reduce_or(
-; CHECK-NEXT:    [[X:%.*]] = add nuw <2 x i8> [[XX:%.*]], <i8 1, i8 1>
-; CHECK-NEXT:    [[V:%.*]] = call i8 @llvm.vector.reduce.or.v2i8(<2 x i8> [[X]])
-; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[V]], 0
-; CHECK-NEXT:    ret i1 [[R]]
+; CHECK-NEXT:    ret i1 false
 ;
   %x = add nuw <2 x i8> %xx, <i8 1, i8 1>
   %v = call i8 @llvm.vector.reduce.or(<2 x i8> %x)