http://llvm.org/bugs/show_bug.cgi?id=21220
Bug ID: 21220
Summary: Clang generates broken module, "Instruction does not
dominate all uses!"
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
$ cat t.cpp
struct s {
char c[33];
};
struct t {
t(const s &);
};
extern int a;
void fn1() {
switch (a) {
case 0:
*new t(s());
case 1:
(t(s()));
}
}
$ ~/llvm/Debug+Asserts/bin/clang -cc1 -x c++ t.cpp -o - -emit-llvm -O1
-fexceptions
t.cpp:11:5: warning: expression result unused
*new t(s());
^~~~~~~~~~~
Instruction does not dominate all uses!
%call = call noalias i8* @_Znwm(i64 1) #4
call void @_ZdlPv(i8* %call) #5
fatal error: error in backend: Broken function found, compilation aborted!
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