https://bugs.llvm.org/show_bug.cgi?id=36159
Bug ID: 36159
Summary: Non-determinism exposed by
microsoft-abi-virtual-inheritance.cpp test
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: pe...@pcc.me.uk
CC: llvm-bugs@lists.llvm.org
$ clang -cc1 -internal-isystem .../lib/clang/7.0.0/include -nostdsysteminc
.../clang/test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp -fno-rtti
-std=c++11 -Wno-inaccessible-base -triple=i386-pc-win32 -emit-llvm -o - >
/tmp/1
$ clang -cc1 -internal-isystem .../lib/clang/7.0.0/include -nostdsysteminc
.../clang/test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp -fno-rtti
-std=c++11 -Wno-inaccessible-base -triple=i386-pc-win32 -emit-llvm -o - | diff
-u /tmp/1 -
shows a diff most of the time, e.g.
--- /tmp/1 2018-01-30 17:18:22.750623402 -0800
+++ - 2018-01-30 17:28:37.603706299 -0800
@@ -618,10 +618,10 @@
%vbptr16 = getelementptr inbounds i8, i8* %35, i32 0
%36 = bitcast i8* %vbptr16 to i32**
%vbtable17 = load i32*, i32** %36, align 4
- %37 = getelementptr inbounds i32, i32* %vbtable17, i32 1
+ %37 = getelementptr inbounds i32, i32* %vbtable17, i32 2
%vbase_offs18 = load i32, i32* %37, align 4
%38 = add nsw i32 0, %vbase_offs18
- %vtordisp.value19 = sub i32 %38, 8
+ %vtordisp.value19 = sub i32 %38, 16
%39 = getelementptr inbounds i8, i8* %32, i32 %38
%40 = getelementptr i8, i8* %39, i32 -4
%vtordisp.ptr20 = bitcast i8* %40 to i32*
@@ -630,10 +630,10 @@
%vbptr21 = getelementptr inbounds i8, i8* %41, i32 0
%42 = bitcast i8* %vbptr21 to i32**
%vbtable22 = load i32*, i32** %42, align 4
- %43 = getelementptr inbounds i32, i32* %vbtable22, i32 2
+ %43 = getelementptr inbounds i32, i32* %vbtable22, i32 1
%vbase_offs23 = load i32, i32* %43, align 4
%44 = add nsw i32 0, %vbase_offs23
- %vtordisp.value24 = sub i32 %44, 16
+ %vtordisp.value24 = sub i32 %44, 8
%45 = getelementptr inbounds i8, i8* %32, i32 %44
%46 = getelementptr i8, i8* %45, i32 -4
%vtordisp.ptr25 = bitcast i8* %46 to i32*
--
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