Pass llvm.experimental.noalias.scope.decl to IntrinsicLowering so that it strips out these intrinsics

2 files changed, 60 insertions, 0 deletions

diff --git a/lib/Module/IntrinsicCleaner.cpp b/lib/Module/IntrinsicCleaner.cpp
index bdaca425..8658f611 100644
--- a/lib/Module/IntrinsicCleaner.cpp
+++ b/lib/Module/IntrinsicCleaner.cpp
@@ -349,6 +349,9 @@ bool IntrinsicCleanerPass::runOnBasicBlock(BasicBlock &b, Module &M) {
       case Intrinsic::exp2:
       case Intrinsic::exp:
       case Intrinsic::expect:
+#if LLVM_VERSION_CODE >= LLVM_VERSION(12, 0)
+      case Intrinsic::experimental_noalias_scope_decl:
+#endif
       case Intrinsic::floor:
       case Intrinsic::flt_rounds:
       case Intrinsic::frameaddress:
diff --git a/test/Intrinsics/noalias-scope-decl.ll b/test/Intrinsics/noalias-scope-decl.ll
new file mode 100644
index 00000000..61dcba00
--- /dev/null
+++ b/test/Intrinsics/noalias-scope-decl.ll
@@ -0,0 +1,57 @@
+; REQUIRES: geq-llvm-12.0
+; RUN: rm -rf %t.klee-out
+; RUN: %klee -exit-on-error --output-dir=%t.klee-out --optimize=false %s 2>&1 | FileCheck %s
+
+; Check that IntrinsicCleaner strips out intrinsic
+; CHECK-NOT: KLEE: WARNING ONCE: unsupported intrinsic llvm.experimental.noalias.scope.decl
+
+; Check that Executor doesn't notice stripped intrinsic
+; CHECK-NOT: KLEE: WARNING: unimplemented intrinsic: llvm.experimental.noalias.scope.decl
+; CHECK-NOT: KLEE: ERROR: (location information missing) unimplemented intrinsic
+; CHECK-NOT: KLEE: WARNING: unimplemented intrinsic: llvm.experimental.noalias.scope.decl
+
+; Check that Executor explores all paths
+; CHECK: KLEE: done: completed paths = 1
+; CHECK: KLEE: done: partially completed paths = 0
+; CHECK: KLEE: done: generated tests = 1
+
+
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
+declare void @llvm.experimental.noalias.scope.decl(metadata)
+declare void @abort() noreturn nounwind
+
+define void @test1(i8* %P, i8* %Q) nounwind {
+  tail call void @llvm.experimental.noalias.scope.decl(metadata !0)
+  tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 1, i1 false)
+  ret void
+}
+
+define dso_local i32 @main() local_unnamed_addr {
+  %1 = alloca i32, align 4
+  %2 = alloca i8, align 1
+  %3 = alloca i8, align 1
+  store i32 0, i32* %1, align 4
+  store i8 0, i8* %2, align 1
+  store i8 1, i8* %3, align 1
+
+  call void @test1(i8* %2, i8* %3)
+
+  %4 = load i8, i8* %2, align 1
+  %5 = sext i8 %4 to i32
+  %6 = load i8, i8* %3, align 1
+  %7 = sext i8 %6 to i32
+  %8 = icmp eq i32 %5, %7
+  br i1 %8, label %exit.block, label %abort.block
+
+  exit.block:
+    ret i32 0
+
+  abort.block:
+    call void @abort()
+    unreachable
+}
+
+!0 = !{ !1 }
+!1 = distinct !{ !1, !2, !"test1: var" }
+!2 = distinct !{ !2, !"test1" }