[PATCH] D149414: [ValueTracking] Add logic for `isKnownNonZero(sadd.sat X, Y)`

[Noah Goldstein via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG167ecdaa2cc3: [ValueTracking] Add logic for `isKnownNonZero(sadd.sat X, Y)` (authored by goldstein.w.n).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149414/new/

https://reviews.llvm.org/D149414

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


Index: llvm/test/Analysis/ValueTracking/known-non-zero.ll
===================================================================
--- llvm/test/Analysis/ValueTracking/known-non-zero.ll
+++ llvm/test/Analysis/ValueTracking/known-non-zero.ll
@@ -924,10 +924,7 @@
 ; 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
Index: llvm/lib/Analysis/ValueTracking.cpp
===================================================================
--- llvm/lib/Analysis/ValueTracking.cpp
+++ llvm/lib/Analysis/ValueTracking.cpp
@@ -2932,6 +2932,10 @@
       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))


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D149414.518323.patch
Type: text/x-patch
Size: 1533 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20230430/6ebdb8f6/attachment.bin>