https://bugs.llvm.org/show_bug.cgi?id=50301
Bug ID: 50301
Summary: Not bug. Performance. Loop optimization. clang++ 1.6x
slower than g++
Product: new-bugs
Version: 12.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: h0tc...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 24850
--> https://bugs.llvm.org/attachment.cgi?id=24850&action=edit
Affected C++ Source
It this case https://pastebin.com/rhpWvssR
g++ -O2 fib.cpp -o /tmp/fib;clang++ -O2 -fdiagnostics-color=always fib.cpp -o
/tmp/fib2;/tmp/fib;/tmp/fib2
GCC Execution time: 37.622s
Clag Execution time: 61.858s
With OMP and little bit change algo
GCC Execution time: ~23s
Clag Execution time: ~38s
GCC Version 10.2.0
LLVM 11.1.0 and 12.0.0 git branch
This also happens in more complex code. I simplified code for minimal
instructions.
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