http://llvm.org/bugs/show_bug.cgi?id=14106
Bug #: 14106
Summary: clang::SourceManager::getColumnNumber doesn't scale
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 9362
--> http://llvm.org/bugs/attachment.cgi?id=9362
testcase from glibc
Clang takes over 15 minutes to compile the attached test-case
from the glibc test-suite:
% time clang -w -fno-builtin -O2 -g test-tgmath2.i
clang -w -fno-builtin -O2 -g test-tgmath2.i 925.02s user 0.74s system 99% cpu
15:28.46 total
"perf top" shows that most of the cpu-time is spend in:
clang::SourceManager::getColumnNumber
gcc-4.7 with "--param max-vartrack-size=0" (unlimited hash table slots) only
takes 1:44.47 total.
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