return passingValueIsAlwaysUndefined(V, GEP, PtrValueMayBeModified);
}
- // Look through return.
- if (ReturnInst *Ret = dyn_cast<ReturnInst>(Use)) {
- bool HasNoUndefAttr =
- Ret->getFunction()->hasRetAttribute(Attribute::NoUndef);
- // Return undefined to a noundef return value is undefined.
- if (isa<UndefValue>(C) && HasNoUndefAttr)
- return true;
- // Return null to a nonnull+noundef return value is undefined.
- if (C->isNullValue() && HasNoUndefAttr &&
- Ret->getFunction()->hasRetAttribute(Attribute::NonNull)) {
- return true;
- }
- }
-
// Look through bitcasts.
if (BitCastInst *BC = dyn_cast<BitCastInst>(Use))
return passingValueIsAlwaysUndefined(V, BC, PtrValueMayBeModified);
+++ /dev/null
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s
-
-define noundef i32 @test_ret_noundef(i1 %cond) {
-; CHECK-LABEL: @test_ret_noundef(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: ret i32 1
-;
-entry:
- br i1 %cond, label %bb1, label %bb2
-
-bb1:
- br label %bb2
-
-bb2:
- %r = phi i32 [ undef, %entry ], [ 1, %bb1 ]
- ret i32 %r
-}
-
-define i32 @test_ret(i1 %cond) {
-; CHECK-LABEL: @test_ret(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND:%.*]], i32 1, i32 undef
-; CHECK-NEXT: ret i32 [[SPEC_SELECT]]
-;
-entry:
- br i1 %cond, label %bb1, label %bb2
-
-bb1:
- br label %bb2
-
-bb2:
- %r = phi i32 [ undef, %entry ], [ 1, %bb1 ]
- ret i32 %r
-}
-
-define nonnull noundef ptr @test_ret_nonnull_noundef(i1 %cond, ptr %x) {
-; CHECK-LABEL: @test_ret_nonnull_noundef(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: call void @llvm.assume(i1 [[COND:%.*]])
-; CHECK-NEXT: ret ptr [[X:%.*]]
-;
-entry:
- br i1 %cond, label %bb1, label %bb2
-
-bb1:
- br label %bb2
-
-bb2:
- %r = phi ptr [ null, %entry ], [ %x, %bb1 ]
- ret ptr %r
-}
-
-define nonnull ptr @test_ret_nonnull(i1 %cond, ptr %x) {
-; CHECK-LABEL: @test_ret_nonnull(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND:%.*]], ptr [[X:%.*]], ptr null
-; CHECK-NEXT: ret ptr [[SPEC_SELECT]]
-;
-entry:
- br i1 %cond, label %bb1, label %bb2
-
-bb1:
- br label %bb2
-
-bb2:
- %r = phi ptr [ null, %entry ], [ %x, %bb1 ]
- ret ptr %r
-}
-
-define ptr @test_ret_ptr(i1 %cond, ptr %x) {
-; CHECK-LABEL: @test_ret_ptr(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND:%.*]], ptr [[X:%.*]], ptr null
-; CHECK-NEXT: ret ptr [[SPEC_SELECT]]
-;
-entry:
- br i1 %cond, label %bb1, label %bb2
-
-bb1:
- br label %bb2
-
-bb2:
- %r = phi ptr [ null, %entry ], [ %x, %bb1 ]
- ret ptr %r
-}