http://llvm.org/bugs/show_bug.cgi?id=22665
Bug ID: 22665
Summary: Excessive compile time with -fsanitize=undefined
Product: compiler-rt
Version: unspecified
Hardware: Macintosh
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13930
--> http://llvm.org/bugs/attachment.cgi?id=13930&action=edit
testcase
markus@x4 src % time gcc -g -fsanitize=undefined -O3 -fPIC -msse2
-DHAVE_CONFIG_H -I../easel -I../libdivsufsort -I../easel -I. -I. -o
generic_optacc.o -c generic_optacc.c
-> 1.33s user 0.03s system 99% cpu 1.364 total
markus@x4 src % time clang -g -fsanitize=undefined -O3 -fPIC -msse2
-DHAVE_CONFIG_H -I../easel -I../libdivsufsort -I../easel -I. -I. -o
generic_optacc.o -c generic_optacc.c
-> 645.92s user 0.25s system 99% cpu 10:46.25 total
perf shows:
24.69% libLLVMCodeGen.so.3.7.0svn [.] (anonymous
namespace)::InlineSpiller::propagateSiblingValue
23.47% libLLVMSupport.so.3.7.0svn [.]
llvm::BranchProbability::scale
13.35% libLLVMCodeGen.so.3.7.0svn [.] (anonymous
namespace)::InlineSpiller::traceSiblingValue
11.91% libLLVMCodeGen.so.3.7.0svn [.]
llvm::MachineBlockFrequencyInfo::getBlockFreq
3.26% libLLVMSupport.so.3.7.0svn [.]
llvm::BlockFrequency::operator*=
...
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