https://llvm.org/bugs/show_bug.cgi?id=26013
Bug ID: 26013
Summary: Slow compilation with -O2 vs -O1 (~80sec vs ~2sec)
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: jas...@jawset.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15553
--> https://llvm.org/bugs/attachment.cgi?id=15553&action=edit
preprocessed source to test slow compilation
The attached file is a pre-processed version of http://glew.sourceforge.net/
Compile with:
clang -c -O2 slow_compilation_test.c
The function glewContextInit (line 15278) has a few hundred assignments, many
of which are conditional. The compile time scales with the number of these
assignments (tested by removing some of them from the end of the function
body).
It's thus difficult to extract an isolated test case.
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