http://llvm.org/bugs/show_bug.cgi?id=12377
Bug #: 12377
Summary: Loop trip count not calculated.
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
AssignedTo: unassignedb...@nondot.org
ReportedBy: benny....@gmail.com
CC: llvmbugs@cs.uiuc.edu
Classification: Unclassified
>From GCC PR30730:
unsigned foo(unsigned int n)
{
unsigned x = 0;;
while (n > 10)
{
n -= 2;
x++;
}
return x;
}
gcc turns this into the following, but clang -O3 doesn't
unsigned foo(unsigned int n) {
if (n > 10)
return ((n - 11)/2)+1;
return 0;
}
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