[VPlan] Fix OpType-mismatch in getFlagsFromIndDesc (#168560)

Follow up on a cse OpType-mismatch crash reported due to ef023ca
(Reland [VPlan] Expand WidenInt inductions with nuw/nsw), setting the
OpType correctly when returning from getFlagsFromIndDesc.

Author: artagnon

llvm/lib/Transforms/Vectorize/VPlanUtils.h

@@ -90,7 +90,10 @@ inline VPIRFlags getFlagsFromIndDesc(const InductionDescriptor &ID) {
           ID.getInductionBinOp()))
     return VPIRFlags::WrapFlagsTy(OBO->hasNoUnsignedWrap(),
                                   OBO->hasNoSignedWrap());
-  return {};
+
+  assert(ID.getKind() == InductionDescriptor::IK_IntInduction &&
+         "Expected int induction");
+  return VPIRFlags::WrapFlagsTy(false, false);
 }
 } // namespace vputils
 

llvm/test/Transforms/LoopVectorize/induction-wrapflags.ll

@@ -0,0 +1,70 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "^scalar.ph" --version 6
+; RUN: opt -p loop-vectorize -force-vector-width=4 -S %s | FileCheck %s
+
+define void @induction_with_multiple_instructions_in_chain(ptr %p, ptr noalias %q) {
+; CHECK-LABEL: define void @induction_with_multiple_instructions_in_chain(
+; CHECK-SAME: ptr [[P:%.*]], ptr noalias [[Q:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
+; CHECK:       [[VECTOR_PH]]:
+; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
+; CHECK:       [[VECTOR_BODY]]:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 3, i32 6, i32 9, i32 12>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND1:%.*]] = phi <4 x i32> [ <i32 0, i32 3, i32 6, i32 9>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT2:%.*]], %[[VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP0:%.*]] = sext <4 x i32> [[VEC_IND]] to <4 x i64>
+; CHECK-NEXT:    [[TMP1:%.*]] = extractelement <4 x i64> [[TMP0]], i32 0
+; CHECK-NEXT:    [[TMP2:%.*]] = extractelement <4 x i64> [[TMP0]], i32 1
+; CHECK-NEXT:    [[TMP3:%.*]] = extractelement <4 x i64> [[TMP0]], i32 2
+; CHECK-NEXT:    [[TMP4:%.*]] = extractelement <4 x i64> [[TMP0]], i32 3
+; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr i8, ptr [[P]], i64 [[TMP1]]
+; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr i8, ptr [[P]], i64 [[TMP2]]
+; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr i8, ptr [[P]], i64 [[TMP3]]
+; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr i8, ptr [[P]], i64 [[TMP4]]
+; CHECK-NEXT:    store i8 0, ptr [[TMP5]], align 1
+; CHECK-NEXT:    store i8 0, ptr [[TMP6]], align 1
+; CHECK-NEXT:    store i8 0, ptr [[TMP7]], align 1
+; CHECK-NEXT:    store i8 0, ptr [[TMP8]], align 1
+; CHECK-NEXT:    [[TMP9:%.*]] = sext <4 x i32> [[VEC_IND1]] to <4 x i64>
+; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <4 x i64> [[TMP9]], i32 0
+; CHECK-NEXT:    [[TMP11:%.*]] = extractelement <4 x i64> [[TMP9]], i32 1
+; CHECK-NEXT:    [[TMP12:%.*]] = extractelement <4 x i64> [[TMP9]], i32 2
+; CHECK-NEXT:    [[TMP13:%.*]] = extractelement <4 x i64> [[TMP9]], i32 3
+; CHECK-NEXT:    [[TMP14:%.*]] = getelementptr i8, ptr [[Q]], i64 [[TMP10]]
+; CHECK-NEXT:    [[TMP15:%.*]] = getelementptr i8, ptr [[Q]], i64 [[TMP11]]
+; CHECK-NEXT:    [[TMP16:%.*]] = getelementptr i8, ptr [[Q]], i64 [[TMP12]]
+; CHECK-NEXT:    [[TMP17:%.*]] = getelementptr i8, ptr [[Q]], i64 [[TMP13]]
+; CHECK-NEXT:    store i8 0, ptr [[TMP14]], align 1
+; CHECK-NEXT:    store i8 0, ptr [[TMP15]], align 1
+; CHECK-NEXT:    store i8 0, ptr [[TMP16]], align 1
+; CHECK-NEXT:    store i8 0, ptr [[TMP17]], align 1
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], splat (i32 12)
+; CHECK-NEXT:    [[VEC_IND_NEXT2]] = add <4 x i32> [[VEC_IND1]], splat (i32 12)
+; CHECK-NEXT:    [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
+; CHECK-NEXT:    br i1 [[TMP18]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK:       [[MIDDLE_BLOCK]]:
+; CHECK-NEXT:    br label %[[SCALAR_PH:.*]]
+; CHECK:       [[SCALAR_PH]]:
+;
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  %ind.1 = phi i32 [ 3, %entry ], [ %ind.1.next, %loop ]
+  %ind.2 = phi i32 [ 0, %entry ], [ %ind.1, %loop ]
+  %sext.1 = sext i32 %ind.1 to i64
+  %gep.1 = getelementptr i8, ptr %p, i64 %sext.1
+  store i8 0, ptr %gep.1
+  %sext.2 = sext i32 %ind.2 to i64
+  %gep.2 = getelementptr i8, ptr %q, i64 %sext.2
+  store i8 0, ptr %gep.2
+  %iv.next = add i64 %iv, 1
+  %ind.1.next = add i32 %ind.1, 3
+  %ec = icmp eq i64 %iv, 1024
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}