http://llvm.org/bugs/show_bug.cgi?id=15041
Bug #: 15041
Summary: Test PAQ8p hangs in vectorized loop on
powerpc64-unknown-linux-gnu
Product: libraries
Version: trunk
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The benchmark in projects/test-suite/MultiSource/Benchmarks/PAQ8p has been
failing recently, at least for 64-bit PowerPC. Debug shows that the Clang++
version of the program hangs in _ZN5Mixer6updateEv in a large vectorized loop.
(Aside: G++ does not choose to vectorize this loop, for whatever reason.)
The source loop is:
void update() {
for (int i=0; i<ncxt; ++i) {
int err=((y<<12)-pr[i])*7;
assert(err>=-32768 && err<32768);
if (err) train(&tx[0], &wx[cxt[i]*N], nx, err);
}
nx=base=ncxt=0;
}
The loop is converted into three versions: for.body.i, vector.body.i, and
vector.body. I'm not sure which of the two vector versions is hanging.
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