https://llvm.org/bugs/show_bug.cgi?id=23366
Bug ID: 23366
Summary: Incredibly slow compilation of inline-assembly-heavy
C++ code
Product: clang
Version: 3.6
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 14263
--> https://llvm.org/bugs/attachment.cgi?id=14263&action=edit
OS X Activity Monitor sample of the clang process
In our project we have a single C++ file that contains very large amounts of
inline assembly code.
It used to take no noticeable time to compile this (< 1 second), but after
upgrading to LLVM 3.6 (Apple LLVM 6.1 in Xcode), it's taking tens of minutes.
I'm guessing roughly 30 minutes on this MacBook:
2.2 GHz Intel Core i7
8 GB 1333 MHz DDR3
I'm not at liberty to share the code, however after some testing, it looks like
it might be down to just the quantity of inline assembly code.
On profiling the clang process, the function
clang::GCCAsmStmt::AnalyzeAsmString() seems to be doing all the work. Call
stack from OS X Activity Monitor is attached.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
