https://llvm.org/bugs/show_bug.cgi?id=25729
Bug ID: 25729
Summary: clang 300x slower to compile recursive constexpr
template vs. gcc
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: paul_robin...@playstation.sony.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15391
--> https://llvm.org/bugs/attachment.cgi?id=15391&action=edit
repro with recursive constexpr template
The attached source takes > 10 seconds for me to compile with a
Release build of clang, versus much < .1 seconds for gcc 5.2.1.
The resulting compiled table looks identical.
$ $UP/clang --version
clang version 3.8.0 (trunk 253958)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/probinson/projects/llvm-org/trunk/cobj/bin
$ time $UP/clang -c -std=c++14 h.cpp
real 0m10.348s
user 0m10.311s
sys 0m0.022s
$ gcc-5 --version
gcc-5 (Ubuntu 5.2.1-27ubuntu1~14.04.1) 5.2.1 20141129
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ time gcc-5 -c -std=c++14 h.cpp
real 0m0.027s
user 0m0.015s
sys 0m0.012s
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
