http://llvm.org/bugs/show_bug.cgi?id=5625
Summary: Loop is not eliminated
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Loop Optimizer
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected], [email protected],
[email protected]
Consider the following simple C code:
int* a;
int b;
void foo(unsigned N, int c) {
unsigned i;
a = &b;
for (i=0; i< N; ++i) {
*a = c;
a = &b;
}
}
Obviously the assignments in the loop are redundant. running llvm-gcc -O3 does
not eliminate the loop, however "llvm-gcc t.c -S -o - -emit-llvm -O3 | opt
-std-compile-opts -S" does.
Chris suggested there might be a pass ordering problem
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