http://llvm.org/bugs/show_bug.cgi?id=2571
Summary: Shootout-C++/ackermann has gcc/llc of 0.23x on Linux
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
For whatever reason, ackermann runs very slowly on Linux
GCC: 0.92s
CBE: 2.19s
LLC: 4.01s
making it the slowest test in the Linux results. This bug is to figure out why.
More numbers:
Using g++ (Debian 4.3.1-6) 4.3.1
g++ -O2: 5.9s
g++ -O2 -fwhole-program: 3.1s
g++ -O3: 0.93s
g++ -O3 -fno-strict-aliasing: 0.93s
Is it just unrolling loops?
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