[llvm] 167ecda - [ValueTracking] Add logic for `isKnownNonZero(sadd.sat X, Y)`

[Noah Goldstein via llvm-commits]

Author: Noah Goldstein
Date: 2023-04-30T10:06:46-05:00
New Revision: 167ecdaa2cc34e942b99c567c0b076923ea220c3

URL: https://github.com/llvm/llvm-project/commit/167ecdaa2cc34e942b99c567c0b076923ea220c3
DIFF: https://github.com/llvm/llvm-project/commit/167ecdaa2cc34e942b99c567c0b076923ea220c3.diff

LOG: [ValueTracking] Add logic for `isKnownNonZero(sadd.sat X, Y)`

The logic here is the same for `add` so reuse the existing helper
`isNonZeroAdd`

Alive2 Link:
    https://alive2.llvm.org/ce/z/mhKvC5

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D149414

Added: 
    

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

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 052b1aed47e9..72b89a2eac78 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -2932,6 +2932,10 @@ bool isKnownNonZero(const Value *V, const APInt &DemandedElts, unsigned Depth,
       case Intrinsic::ssub_sat:
         return isNonZeroSub(DemandedElts, Depth, Q, BitWidth,
                             II->getArgOperand(0), II->getArgOperand(1));
+      case Intrinsic::sadd_sat:
+        return isNonZeroAdd(DemandedElts, Depth, Q, BitWidth,
+                            II->getArgOperand(0), II->getArgOperand(1),
+                            /*NSW*/ true);
       case Intrinsic::uadd_sat:
         if (isKnownNonZero(II->getArgOperand(0), DemandedElts, Depth, Q) ||
             isKnownNonZero(II->getArgOperand(1), DemandedElts, Depth, Q))

diff  --git a/llvm/test/Analysis/ValueTracking/known-non-zero.ll b/llvm/test/Analysis/ValueTracking/known-non-zero.ll
index ca158c2ed91a..05723316adfa 100644
--- a/llvm/test/Analysis/ValueTracking/known-non-zero.ll
+++ b/llvm/test/Analysis/ValueTracking/known-non-zero.ll
@@ -924,10 +924,7 @@ define i1 @sadd_sat_nonzero(i8 %xx, i8 %yy, i8 %ind) {
 ; CHECK-NEXT:    [[Y_POS:%.*]] = icmp sge i8 [[YY:%.*]], 0
 ; CHECK-NEXT:    call void @llvm.assume(i1 [[X_STRICT_POS]])
 ; CHECK-NEXT:    call void @llvm.assume(i1 [[Y_POS]])
-; CHECK-NEXT:    [[X:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[XX]], i8 [[YY]])
-; CHECK-NEXT:    [[Z:%.*]] = or i8 [[X]], [[IND:%.*]]
-; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[Z]], 0
-; CHECK-NEXT:    ret i1 [[R]]
+; CHECK-NEXT:    ret i1 false
 ;
   %x_strict_pos = icmp sgt i8 %xx, 0
   %y_pos = icmp sge i8 %yy, 0