llvm-reduce: Handle disjoint flag

Author: arsenm

llvm/test/tools/llvm-reduce/reduce-flags.ll

@@ -216,3 +216,19 @@ define i64 @zext_nneg_keep(i32 %a) {
   %op = zext nneg i32 %a to i64
   ret i64 %op
 }
+
+; CHECK-LABEL: @or_disjoint_drop(
+; INTERESTING: = or
+; RESULT: or i32
+define i32 @or_disjoint_drop(i32 %a, i32 %b) {
+  %op = or disjoint i32 %a, %b
+  ret i32 %op
+}
+
+; CHECK-LABEL: @or_disjoint_keep(
+; INTERESTING: = or disjoint
+; RESULT: or disjoint i32
+define i32 @or_disjoint_keep(i32 %a, i32 %b) {
+  %op = or disjoint i32 %a, %b
+  ret i32 %op
+}

llvm/tools/llvm-reduce/deltas/ReduceInstructionFlags.cpp

@@ -33,6 +33,9 @@ static void reduceFlagsInModule(Oracle &O, ReducerWorkItem &WorkItem) {
       } else if (auto *NNI = dyn_cast<PossiblyNonNegInst>(&I)) {
         if (NNI->hasNonNeg() && !O.shouldKeep())
           NNI->setNonNeg(false);
+      } else if (auto *PDI = dyn_cast<PossiblyDisjointInst>(&I)) {
+        if (PDI->isDisjoint() && !O.shouldKeep())
+          PDI->setIsDisjoint(false);
       } else if (auto *GEP = dyn_cast<GetElementPtrInst>(&I)) {
         if (GEP->isInBounds() && !O.shouldKeep())
           GEP->setIsInBounds(false);