c++ new operators are not malloc-like functions because they do not return uninitialized memory.

Users may overide new-operators and implement any function that they like.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179071 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 21 insertions, 17 deletions

diff --git a/test/Transforms/GVN/newoperator.ll b/test/Transforms/GVN/newoperator.ll
new file mode 100644
index 0000000..21cfc1d
--- /dev/null
+++ b/test/Transforms/GVN/newoperator.ll
@@ -0,0 +1,20 @@
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
+
+; We can't remove the load because new operators are overideable and can return non-undefined memory.
+;CHECK: main
+;CHECK: load
+;CHECK: ret
+define i32 @main(i32 %argc, i8** nocapture %argv) ssp uwtable {
+  %1 = tail call noalias i8* @_Znam(i64 800)
+  %2 = bitcast i8* %1 to i32**
+  %3 = load i32** %2, align 8, !tbaa !0
+  %4 = icmp eq i32* %3, null
+  %5 = zext i1 %4 to i32
+  ret i32 %5
+}
+
+declare noalias i8* @_Znam(i64)
+
+!0 = metadata !{metadata !"any pointer", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}
diff --git a/test/Transforms/InstCombine/invoke.ll b/test/Transforms/InstCombine/invoke.ll
index 04eaf86..4ef86dd 100644
--- a/test/Transforms/InstCombine/invoke.ll
+++ b/test/Transforms/InstCombine/invoke.ll
@@ -47,19 +47,3 @@ lpad:
   unreachable
 }
 
-; CHECK: @f3
-define void @f3() nounwind uwtable ssp {
-; CHECK: invoke void @llvm.donothing()
-  %call = invoke noalias i8* @_Znwm(i64 13)
-          to label %invoke.cont unwind label %lpad
-
-invoke.cont:
-  ret void
-
-lpad:
-  %1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
-          filter [0 x i8*] zeroinitializer
-  %2 = extractvalue { i8*, i32 } %1, 0
-  tail call void @__cxa_call_unexpected(i8* %2) noreturn nounwind
-  unreachable
-}
diff --git a/test/Transforms/InstCombine/objsize-64.ll b/test/Transforms/InstCombine/objsize-64.ll
index 530e123..6ecc830 100644
--- a/test/Transforms/InstCombine/objsize-64.ll
+++ b/test/Transforms/InstCombine/objsize-64.ll
@@ -25,7 +25,7 @@ entry:
           to label %invoke.cont unwind label %lpad
 
 invoke.cont:
-; CHECK: ret i64 13
+; CHECK: ret i64 %0
   store i8* %call, i8** %esc
   %0 = tail call i64 @llvm.objectsize.i64(i8* %call, i1 false)
   ret i64 %0