[Attributor] Make use of AANoUndef in AAUndefinedBehavior

[okura]

Summary

This patch makes it possible for AAUB to use information from AANoUndef.
This is the next patch of D86983

[okura]

minor change

[jdoerfert]

LGTM

llvm/lib/Transforms/IPO/AttributorAttributes.cpp

auto InspectCallSiteForUB = [&](Instruction &I) {
       if (!Callee)
         return true;
       for (unsigned idx = 0; idx < CB.getNumArgOperands(); idx++) {
         // If current argument is known to be simplified to null pointer and the
         // corresponding argument position is known to have nonnull attribute,
         // the argument is poison. Furthermore, if the argument is poison and
         // the position is known to have noundef attriubte, this callsite is
         // considered UB.
-        // TODO: Check also nopoison attribute if it is introduced.
         if (idx >= Callee->arg_size())
           break;
         Value *ArgVal = CB.getArgOperand(idx);
         if (!ArgVal)
           continue;
         // Here, we handle three cases.
         //   (1) Not having a value means it is dead. (we can replace the value
         //       with undef)
         //   (2) Simplified to undef. The argument violate noundef attriubte.
         //   (3) Simplified to null pointer where known to be nonnull.
         //       The argument is a poison value and violate noundef attribute.
         IRPosition CalleeArgumentIRP = IRPosition::callsite_argument(CB, idx);
-        if (!CalleeArgumentIRP.hasAttr({Attribute::NoUndef}))
+        auto &NoUndefAA = A.getAAFor<AANoUndef>(*this, CalleeArgumentIRP,
+                                                /* TrackDependence */ false);
+        if (!NoUndefAA.isKnownNoUndef())
           continue;
         auto &ValueSimplifyAA = A.getAAFor<AAValueSimplify>(
             *this, IRPosition::value(*ArgVal), /* TrackDependence */ false);
         if (!ValueSimplifyAA.isKnown())
           continue;
         Optional<Value *> SimplifiedVal =
             ValueSimplifyAA.getAssumedSimplifiedValue(A);
         if (!SimplifiedVal.hasValue() ||
A.checkForAllInstructions(InspectMemAccessInstForUB, *this,
                                Instruction::AtomicRMW},
                               /* CheckBBLivenessOnly */ true);
     A.checkForAllInstructions(InspectBrInstForUB, *this, {Instruction::Br},
                               /* CheckBBLivenessOnly */ true);
     A.checkForAllCallLikeInstructions(InspectCallSiteForUB, *this);
 
     // If the returned position of the anchor scope has noundef attriubte, check
     // all returned instructions.
-    // TODO: If AANoUndef is implemented, ask it here.
-    if (IRPosition::returned(*getAnchorScope()).hasAttr({Attribute::NoUndef}))
-      A.checkForAllReturnedValuesAndReturnInsts(InspectReturnInstForUB, *this);
+    if (!getAnchorScope()->getReturnType()->isVoidTy()) {
+      auto &RetPosNoUndefAA =
+          A.getAAFor<AANoUndef>(*this, IRPosition::returned(*getAnchorScope()),
+                                /* TrackDependence */ false);
+      if (RetPosNoUndefAA.isKnownNoUndef())
+        A.checkForAllReturnedValuesAndReturnInsts(InspectReturnInstForUB,
+                                                  *this);
+    }
 
     if (NoUBPrevSize != AssumedNoUBInsts.size() ||
         UBPrevSize != KnownUBInsts.size())
       return ChangeStatus::CHANGED;
     return ChangeStatus::UNCHANGED;
   }
 
   bool isKnownToCauseUB(Instruction *I) const override {

llvm/test/Transforms/Attributor/IPConstantProp/PR16052.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes
-; RUN: opt -attributor -enable-new-pm=0 -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=2 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
-; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=2 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
+; RUN: opt -attributor -enable-new-pm=0 -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=3 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
+; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=3 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
 ; RUN: opt -attributor-cgscc -enable-new-pm=0 -attributor-manifest-internal  -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_NPM,IS__CGSCC____,IS________OPM,IS__CGSCC_OPM
 ; RUN: opt -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal  -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_OPM,IS__CGSCC____,IS________NPM,IS__CGSCC_NPM
 
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
 
 define i64 @fn2() {
 ; IS__TUNIT____: Function Attrs: nofree nosync nounwind readnone willreturn

llvm/test/Transforms/Attributor/alwaysinline.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes
-; RUN: opt -attributor -enable-new-pm=0 -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=2 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
-; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=2 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
+; RUN: opt -attributor -enable-new-pm=0 -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=3 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
+; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=3 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
 ; RUN: opt -attributor-cgscc -enable-new-pm=0 -attributor-manifest-internal  -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_NPM,IS__CGSCC____,IS________OPM,IS__CGSCC_OPM
 ; RUN: opt -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal  -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_OPM,IS__CGSCC____,IS________NPM,IS__CGSCC_NPM
 ;
 ; When a function is marked `alwaysinline` and is able to be inlined,
 ; we can IPO its boundaries
 
 ; the function is not exactly defined, and marked alwaysinline and can be inlined,
 ; so the function can be analyzed

llvm/test/Transforms/Attributor/noreturn_sync.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes
-; RUN: opt -attributor  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=2 -S < %s | FileCheck %s
+; RUN: opt -attributor  -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=3 -S < %s | FileCheck %s
 ;
 ; This file is the same as noreturn_async.ll but with a personality which
 ; indicates that the exception handler *cannot* catch asynchronous exceptions.
 ; As a consequence, invokes to noreturn and nounwind functions are translated
 ; to calls followed by an unreachable.
 ;
 ; https://reviews.llvm.org/D59978#inline-586873
 ;

llvm/test/Transforms/Attributor/undefined_behavior.ll

ret:
   ret void
 }
 
 ; Pass null directly to argument with nonnull attribute
 define void @arg_nonnull_violation1_1() {
 ; IS__TUNIT____: Function Attrs: nofree nosync nounwind readnone willreturn
 ; IS__TUNIT____-LABEL: define {{[^@]+}}@arg_nonnull_violation1_1
 ; IS__TUNIT____-SAME: () [[ATTR0]] {
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_1(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null) [[ATTR7:#.*]]
-; IS__TUNIT____-NEXT:    ret void
+; IS__TUNIT____-NEXT:    unreachable
 ;
 ; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
 ; IS__CGSCC____-LABEL: define {{[^@]+}}@arg_nonnull_violation1_1
 ; IS__CGSCC____-SAME: () [[ATTR0]] {
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_1(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 dereferenceable(4) null) [[ATTR7:#.*]]
-; IS__CGSCC____-NEXT:    ret void
+; IS__CGSCC____-NEXT:    unreachable
 ;
   call void @arg_nonnull_1(i32* null)
   ret void
 }
 
 define void @arg_nonnull_violation1_2() {
 ; IS__TUNIT____: Function Attrs: nofree nosync nounwind readnone willreturn
 ; IS__TUNIT____-LABEL: define {{[^@]+}}@arg_nonnull_violation1_2
;
   ret void
 }
 
 ; A case that depends on value simplification
 define void @arg_nonnull_violation2_1(i1 %c) {
 ; IS__TUNIT____: Function Attrs: nofree nosync nounwind readnone willreturn
 ; IS__TUNIT____-LABEL: define {{[^@]+}}@arg_nonnull_violation2_1
 ; IS__TUNIT____-SAME: (i1 [[C:%.*]]) [[ATTR0]] {
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_1(i32* nocapture nofree noundef nonnull writeonly align 536870912 null) [[ATTR7]]
-; IS__TUNIT____-NEXT:    ret void
+; IS__TUNIT____-NEXT:    unreachable
 ;
 ; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
 ; IS__CGSCC____-LABEL: define {{[^@]+}}@arg_nonnull_violation2_1
 ; IS__CGSCC____-SAME: (i1 [[C:%.*]]) [[ATTR0]] {
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_1(i32* nocapture nofree noundef nonnull writeonly align 536870912 dereferenceable(4) null) [[ATTR7]]
-; IS__CGSCC____-NEXT:    ret void
+; IS__CGSCC____-NEXT:    unreachable
 ;
   %null = getelementptr i32, i32* null, i32 0
   %mustnull = select i1 %c, i32* null, i32* %null
   call void @arg_nonnull_1(i32* %mustnull)
   ret void
 }
 
 define void @arg_nonnull_violation2_2(i1 %c) {

 ; Cases for single and multiple violation at a callsite
 define void @arg_nonnull_violation3_1(i1 %c) {
 ; IS__TUNIT____: Function Attrs: nofree nosync nounwind readnone willreturn
 ; IS__TUNIT____-LABEL: define {{[^@]+}}@arg_nonnull_violation3_1
 ; IS__TUNIT____-SAME: (i1 [[C:%.*]]) [[ATTR0]] {
 ; IS__TUNIT____-NEXT:    [[PTR:%.*]] = alloca i32, align 4
 ; IS__TUNIT____-NEXT:    br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
 ; IS__TUNIT____:       t:
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
+; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7:#.*]]
 ; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__TUNIT____-NEXT:    br label [[RET:%.*]]
+; IS__TUNIT____-NEXT:    unreachable
 ; IS__TUNIT____:       f:
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__TUNIT____-NEXT:    br label [[RET]]
+; IS__TUNIT____-NEXT:    unreachable
 ; IS__TUNIT____:       ret:
 ; IS__TUNIT____-NEXT:    ret void
 ;
 ; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
 ; IS__CGSCC____-LABEL: define {{[^@]+}}@arg_nonnull_violation3_1
 ; IS__CGSCC____-SAME: (i1 [[C:%.*]]) [[ATTR0]] {
 ; IS__CGSCC____-NEXT:    [[PTR:%.*]] = alloca i32, align 4
 ; IS__CGSCC____-NEXT:    br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
 ; IS__CGSCC____:       t:
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
+; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7:#.*]]
 ; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__CGSCC____-NEXT:    br label [[RET:%.*]]
+; IS__CGSCC____-NEXT:    unreachable
 ; IS__CGSCC____:       f:
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
-; IS__CGSCC____-NEXT:    br label [[RET]]
+; IS__CGSCC____-NEXT:    unreachable
 ; IS__CGSCC____:       ret:
 ; IS__CGSCC____-NEXT:    ret void
 ;
   %ptr = alloca i32
   br i1 %c, label %t, label %f
 t:
   call void @arg_nonnull_12(i32* %ptr, i32* %ptr, i32* %ptr)
   call void @arg_nonnull_12(i32* %ptr, i32* %ptr, i32* null)

 ; IS__TUNIT____-SAME: (i1 [[C:%.*]]) [[ATTR0]] {
 ; IS__TUNIT____-NEXT:    [[PTR:%.*]] = alloca i32, align 4
 ; IS__TUNIT____-NEXT:    br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
 ; IS__TUNIT____:       t:
 ; IS__TUNIT____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
 ; IS__TUNIT____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
 ; IS__TUNIT____-NEXT:    unreachable
 ; IS__TUNIT____:       f:
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__TUNIT____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
 ; IS__TUNIT____-NEXT:    unreachable
 ; IS__TUNIT____:       ret:
 ; IS__TUNIT____-NEXT:    ret void
 ;
 ; IS__CGSCC____: Function Attrs: nofree norecurse nosync nounwind readnone willreturn
 ; IS__CGSCC____-LABEL: define {{[^@]+}}@arg_nonnull_violation3_2
 ; IS__CGSCC____-SAME: (i1 [[C:%.*]]) [[ATTR0]] {
 ; IS__CGSCC____-NEXT:    [[PTR:%.*]] = alloca i32, align 4
 ; IS__CGSCC____-NEXT:    br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
 ; IS__CGSCC____:       t:
 ; IS__CGSCC____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
 ; IS__CGSCC____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
 ; IS__CGSCC____-NEXT:    unreachable
 ; IS__CGSCC____:       f:
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]]) [[ATTR7]]
-; IS__CGSCC____-NEXT:    call void @arg_nonnull_12_noundef_2(i32* noalias nocapture nofree noundef nonnull writeonly align 536870912 null, i32* nocapture nofree noundef nonnull writeonly align 4 dereferenceable(4) [[PTR]], i32* noalias nocapture nofree noundef writeonly align 536870912 null) [[ATTR7]]
 ; IS__CGSCC____-NEXT:    unreachable
 ; IS__CGSCC____:       ret:
 ; IS__CGSCC____-NEXT:    ret void
 ;
   %ptr = alloca i32
   br i1 %c, label %t, label %f
 t:
   call void @arg_nonnull_12_noundef_2(i32* %ptr, i32* %ptr, i32* %ptr)

llvm/test/Transforms/OpenMP/parallel_deletion.ll

 ;
 ; FIXME: We do not realize that `a` is dead and all accesses to it can be removed
 ;        making the parallel regions readonly and deletable.
 define void @delete_parallel_2() {
 ; CHECK-LABEL: define {{[^@]+}}@delete_parallel_2()
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[A:%.*]] = alloca i32, align 4
 ; CHECK-NEXT:    [[TMP:%.*]] = bitcast i32* [[A]] to i8*
-; CHECK-NEXT:    call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull align 4 dereferenceable(4) [[TMP]]) #0
+; CHECK-NEXT:    call void @llvm.lifetime.start.p0i8(i64 noundef 4, i8* noundef nonnull align 4 dereferenceable(4) [[TMP]]) #0
 ; CHECK-NEXT:    store i32 0, i32* [[A]], align 4
 ; CHECK-NEXT:    call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* noundef nonnull align 8 dereferenceable(24) @0, i32 noundef 1, void (i32*, i32*, ...)* noundef bitcast (void (i32*, i32*, i32*)* @.omp_outlined..3 to void (i32*, i32*, ...)*), i32* nocapture nofree noundef nonnull align 4 dereferenceable(4) [[A]])
 ; CHECK-NEXT:    call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* noundef nonnull align 8 dereferenceable(24) @0, i32 noundef 1, void (i32*, i32*, ...)* noundef bitcast (void (i32*, i32*, i32*)* @.omp_outlined..4 to void (i32*, i32*, ...)*), i32* nocapture noundef nonnull align 4 dereferenceable(4) [[A]])
 ; CHECK-NEXT:    call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* noundef nonnull align 8 dereferenceable(24) @0, i32 noundef 1, void (i32*, i32*, ...)* noundef bitcast (void (i32*, i32*, i32*)* @.omp_outlined..5 to void (i32*, i32*, ...)*), i32* nocapture noundef nonnull align 4 dereferenceable(4) [[A]])
 ; CHECK-NEXT:    call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* noundef nonnull align 8 dereferenceable(24) @0, i32 noundef 1, void (i32*, i32*, ...)* noundef bitcast (void (i32*, i32*, i32*)* @.omp_outlined..6 to void (i32*, i32*, ...)*), i32* nocapture noundef nonnull align 4 dereferenceable(4) [[A]])
 ; CHECK-NEXT:    [[TMP1:%.*]] = bitcast i32* [[A]] to i8*
-; CHECK-NEXT:    call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull [[TMP1]])
+; CHECK-NEXT:    call void @llvm.lifetime.end.p0i8(i64 noundef 4, i8* noundef nonnull [[TMP1]])
 ; CHECK-NEXT:    ret void
 ;
 entry:
   %a = alloca i32, align 4
   %tmp = bitcast i32* %a to i8*
   call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %tmp)
   store i32 0, i32* %a, align 4
   call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 1, void (i32*, i32*, ...)* bitcast (void (i32*, i32*, i32*)* @.omp_outlined..3 to void (i32*, i32*, ...)*), i32* nonnull %a)
if.end:                                           ; preds = %if.then, %entry
   ret void
 }
 
 define internal void @.omp_outlined..4(i32* noalias %.global_tid., i32* noalias %.bound_tid., i32* dereferenceable(4) %a) {
 ; CHECK-LABEL: define {{[^@]+}}@.omp_outlined..4
 ; CHECK-SAME: (i32* noalias nocapture nonnull readonly align 4 dereferenceable(4) [[DOTGLOBAL_TID_:%.*]], i32* noalias nocapture nofree readnone [[DOTBOUND_TID_:%.*]], i32* nocapture noundef nonnull align 4 dereferenceable(4) [[A:%.*]])
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[TMP:%.*]] = load i32, i32* [[DOTGLOBAL_TID_]], align 4
-; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @__kmpc_master(%struct.ident_t* nonnull @0, i32 [[TMP]])
+; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @__kmpc_master(%struct.ident_t* noundef nonnull @0, i32 [[TMP]])
 ; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[TMP1]], 0
 ; CHECK-NEXT:    br i1 [[TMP2]], label [[OMP_IF_END:%.*]], label [[OMP_IF_THEN:%.*]]
 ; CHECK:       omp_if.then:
 ; CHECK-NEXT:    [[TMP3:%.*]] = load i32, i32* [[A]], align 4
 ; CHECK-NEXT:    [[INC:%.*]] = add nsw i32 [[TMP3]], 1
 ; CHECK-NEXT:    store i32 [[INC]], i32* [[A]], align 4
-; CHECK-NEXT:    call void @__kmpc_end_master(%struct.ident_t* nonnull @0, i32 [[TMP]])
+; CHECK-NEXT:    call void @__kmpc_end_master(%struct.ident_t* noundef nonnull @0, i32 [[TMP]])
 ; CHECK-NEXT:    br label [[OMP_IF_END]]
 ; CHECK:       omp_if.end:
 ; CHECK-NEXT:    ret void
 ;
 entry:
   %tmp = load i32, i32* %.global_tid., align 4
   %tmp1 = call i32 @__kmpc_master(%struct.ident_t* nonnull @0, i32 %tmp)
   %tmp2 = icmp eq i32 %tmp1, 0

 declare i32 @__kmpc_master(%struct.ident_t*, i32)
 
 declare void @__kmpc_end_master(%struct.ident_t*, i32)
 
 define internal void @.omp_outlined..5(i32* noalias %.global_tid., i32* noalias %.bound_tid., i32* dereferenceable(4) %a) {
 ; CHECK-LABEL: define {{[^@]+}}@.omp_outlined..5
 ; CHECK-SAME: (i32* noalias nocapture nonnull readonly align 4 dereferenceable(4) [[DOTGLOBAL_TID_:%.*]], i32* noalias nocapture nofree readnone [[DOTBOUND_TID_:%.*]], i32* nocapture noundef nonnull align 4 dereferenceable(4) [[A:%.*]])
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[OMP_GLOBAL_THREAD_NUM:%.*]] = call i32 @__kmpc_global_thread_num(%struct.ident_t* nonnull @0)
+; CHECK-NEXT:    [[OMP_GLOBAL_THREAD_NUM:%.*]] = call i32 @__kmpc_global_thread_num(%struct.ident_t* noundef nonnull @0)
 ; CHECK-NEXT:    [[TMP:%.*]] = load i32, i32* [[DOTGLOBAL_TID_]], align 4
-; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @__kmpc_single(%struct.ident_t* nonnull @0, i32 [[TMP]])
+; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @__kmpc_single(%struct.ident_t* noundef nonnull @0, i32 [[TMP]])
 ; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[TMP1]], 0
 ; CHECK-NEXT:    br i1 [[TMP2]], label [[OMP_IF_END:%.*]], label [[OMP_IF_THEN:%.*]]
 ; CHECK:       omp_if.then:
 ; CHECK-NEXT:    [[TMP3:%.*]] = load i32, i32* [[A]], align 4
 ; CHECK-NEXT:    [[INC:%.*]] = add nsw i32 [[TMP3]], 1
 ; CHECK-NEXT:    store i32 [[INC]], i32* [[A]], align 4
-; CHECK-NEXT:    call void @__kmpc_end_single(%struct.ident_t* nonnull @0, i32 [[TMP]])
+; CHECK-NEXT:    call void @__kmpc_end_single(%struct.ident_t* noundef nonnull @0, i32 [[TMP]])
 ; CHECK-NEXT:    br label [[OMP_IF_END]]
 ; CHECK:       omp_if.end:
-; CHECK-NEXT:    call void @__kmpc_barrier(%struct.ident_t* nonnull @1, i32 [[OMP_GLOBAL_THREAD_NUM]])
+; CHECK-NEXT:    call void @__kmpc_barrier(%struct.ident_t* noundef nonnull @1, i32 [[OMP_GLOBAL_THREAD_NUM]])
 ; CHECK-NEXT:    ret void
 ;
 entry:
   %omp_global_thread_num = call i32 @__kmpc_global_thread_num(%struct.ident_t* nonnull @0)
   %tmp = load i32, i32* %.global_tid., align 4
   %tmp1 = call i32 @__kmpc_single(%struct.ident_t* nonnull @0, i32 %tmp)
   %tmp2 = icmp eq i32 %tmp1, 0
   br i1 %tmp2, label %omp_if.end, label %omp_if.then

 
 define internal void @.omp_outlined..6(i32* noalias %.global_tid., i32* noalias %.bound_tid., i32* dereferenceable(4) %a) {
 ; CHECK-LABEL: define {{[^@]+}}@.omp_outlined..6
 ; CHECK-SAME: (i32* noalias nocapture nonnull readonly align 4 dereferenceable(4) [[DOTGLOBAL_TID_:%.*]], i32* noalias nocapture nofree readnone [[DOTBOUND_TID_:%.*]], i32* nocapture noundef nonnull align 4 dereferenceable(4) [[A:%.*]])
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[A1:%.*]] = alloca i32, align 4
 ; CHECK-NEXT:    [[DOTOMP_REDUCTION_RED_LIST:%.*]] = alloca [1 x i8*], align 8
 ; CHECK-NEXT:    [[TMP:%.*]] = bitcast i32* [[A1]] to i8*
-; CHECK-NEXT:    call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull align 4 [[TMP]]) #0
+; CHECK-NEXT:    call void @llvm.lifetime.start.p0i8(i64 noundef 4, i8* noundef nonnull align 4 [[TMP]]) #0
 ; CHECK-NEXT:    store i32 1, i32* [[A1]], align 4
 ; CHECK-NEXT:    [[TMP1:%.*]] = bitcast [1 x i8*]* [[DOTOMP_REDUCTION_RED_LIST]] to i32**
 ; CHECK-NEXT:    store i32* [[A1]], i32** [[TMP1]], align 8
 ; CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[DOTGLOBAL_TID_]], align 4
 ; CHECK-NEXT:    [[TMP3:%.*]] = bitcast [1 x i8*]* [[DOTOMP_REDUCTION_RED_LIST]] to i8*
-; CHECK-NEXT:    [[TMP4:%.*]] = call i32 @__kmpc_reduce_nowait(%struct.ident_t* nonnull @2, i32 [[TMP2]], i32 1, i64 8, i8* nonnull align 8 [[TMP3]], void (i8*, i8*)* nonnull @.omp.reduction.reduction_func, [8 x i32]* nonnull @.gomp_critical_user_.reduction.var)
+; CHECK-NEXT:    [[TMP4:%.*]] = call i32 @__kmpc_reduce_nowait(%struct.ident_t* noundef nonnull @2, i32 [[TMP2]], i32 noundef 1, i64 noundef 8, i8* noundef nonnull align 8 [[TMP3]], void (i8*, i8*)* noundef nonnull @.omp.reduction.reduction_func, [8 x i32]* noundef nonnull @.gomp_critical_user_.reduction.var)
 ; CHECK-NEXT:    switch i32 [[TMP4]], label [[DOTOMP_REDUCTION_DEFAULT:%.*]] [
 ; CHECK-NEXT:    i32 1, label [[DOTOMP_REDUCTION_CASE1:%.*]]
 ; CHECK-NEXT:    i32 2, label [[DOTOMP_REDUCTION_CASE2:%.*]]
 ; CHECK-NEXT:    ]
 ; CHECK:       .omp.reduction.case1:
 ; CHECK-NEXT:    [[TMP5:%.*]] = load i32, i32* [[A]], align 4
 ; CHECK-NEXT:    [[TMP6:%.*]] = load i32, i32* [[A1]], align 4
 ; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[TMP5]], [[TMP6]]
 ; CHECK-NEXT:    store i32 [[ADD]], i32* [[A]], align 4
-; CHECK-NEXT:    call void @__kmpc_end_reduce_nowait(%struct.ident_t* nonnull @2, i32 [[TMP2]], [8 x i32]* nonnull @.gomp_critical_user_.reduction.var)
+; CHECK-NEXT:    call void @__kmpc_end_reduce_nowait(%struct.ident_t* noundef nonnull @2, i32 [[TMP2]], [8 x i32]* noundef nonnull @.gomp_critical_user_.reduction.var)
 ; CHECK-NEXT:    br label [[DOTOMP_REDUCTION_DEFAULT]]
 ; CHECK:       .omp.reduction.case2:
 ; CHECK-NEXT:    [[TMP7:%.*]] = load i32, i32* [[A1]], align 4
 ; CHECK-NEXT:    [[TMP8:%.*]] = atomicrmw add i32* [[A]], i32 [[TMP7]] monotonic
 ; CHECK-NEXT:    br label [[DOTOMP_REDUCTION_DEFAULT]]
 ; CHECK:       .omp.reduction.default:
 ; CHECK-NEXT:    [[TMP9:%.*]] = bitcast i32* [[A1]] to i8*
-; CHECK-NEXT:    call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull [[TMP9]])
+; CHECK-NEXT:    call void @llvm.lifetime.end.p0i8(i64 noundef 4, i8* noundef nonnull [[TMP9]])
 ; CHECK-NEXT:    ret void
 ;
 entry:
   %a1 = alloca i32, align 4
   %.omp.reduction.red_list = alloca [1 x i8*], align 8
   %tmp = bitcast i32* %a1 to i8*
   call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %tmp)
   store i32 1, i32* %a1, align 4