https://llvm.org/bugs/show_bug.cgi?id=25550
Bug ID: 25550
Summary: asan conflicts with gvn
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: k...@google.com
Reporter: k...@google.com
CC: aizat...@chromium.org, llvm-bugs@lists.llvm.org,
st...@mit.edu
Classification: Unclassified
[initially reported by Greg Stark:
http://lists.llvm.org/pipermail/llvm-dev/2015-November/092484.html]
Reproducer:
typedef union {
short q;
struct {
short x;
short y;
int for_alignment;
} w;
} U;
int main() {
char *buf = new char[2];
buf[0] = buf[1] = 0x0;
U *u = (U *)buf;
return u->q == 0 ? 0 : u->w.y;
}
gvn will speculatively combine two 2-byte loads into one,
thus moving one of the loads outside of the conditional pass.
We've seen these problems in the past, and have at least two guards against
those:
lib/Analysis/MemoryDependenceAnalysis.cpp:
Attribute::SanitizeAddress))
lib/Analysis/ValueTracking.cpp: Attribute::SanitizeAddress))
but none of these two help here.
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