http://llvm.org/bugs/show_bug.cgi?id=12521
Bug #: 12521
Summary: dsputil.c from ffmpeg takes > 13s to compile with -O
(1.3s without)
Product: clang
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 8370
--> http://llvm.org/bugs/attachment.cgi?id=8370
repro
Attached is a preprocessed version of ffmpeg's dsputil.c. The file is
comparably small (700kB, 11k lines), but takes a long time to codegen:
hummer:src thakis$ time third_party/llvm-build/Release+Asserts/bin/clang -c
~/dsputil.i
real 0m1.985s
user 0m1.619s
sys 0m0.082s
hummer:src thakis$ time third_party/llvm-build/Release+Asserts/bin/clang -c -O
~/dsputil.i
real 0m13.894s
user 0m11.112s
sys 0m0.141s
hummer:src thakis$ time third_party/llvm-build/Release+Asserts/bin/clang -c -O
~/dsputil.i -fsyntax-only
real 0m0.512s
user 0m0.458s
sys 0m0.025s
This is with clang r153589.
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