http://llvm.org/bugs/show_bug.cgi?id=18055
Bug ID: 18055
Summary: Much slower compilation for proto code compared to
LLVM3.2
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11607
--> http://llvm.org/bugs/attachment.cgi?id=11607&action=edit
Test case demonstrating the slowdown
Code extensively using the Boost Proto library compiles slower by a factor of 3
to 6 comparing clang 3.2 against clang 3.3 and 3.4. The attached preprocessed
code demonstrates the problem, running "clang++ -ftemplate-depth=512 proto.ii
-stdlib=libstdc++ -o proto":
Clang 3.2 (OS X binary from website):
1.49s user 0.11s system 93% cpu 1.712 total
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn):
10.16s user 0.09s system 93% cpu 10.996 total
latest from git (reports clang version 3.5):
5.51s user 0.09s system 88% cpu 6.334 total
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