http://llvm.org/bugs/show_bug.cgi?id=16386
Bug ID: 16386
Summary: store forwarding across operator new() call
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
int x;
volatile int z;
int *f() {
x = 1;
int *p = new int;
z = x;
return p;
}
clang -O2:
store i32 1, i32* @x, align 4, !tbaa !0
%call = tail call noalias i8* @_Znwm(i64 4)
%0 = bitcast i8* %call to i32*
store volatile i32 1, i32* @z, align 4, !tbaa !0
This does not allow overloading operator new() to access 'x'.
-fno-sane-operator-new disables this optimization.
AFAIU, it should be always disabled.
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