https://llvm.org/bugs/show_bug.cgi?id=25895
Bug ID: 25895
Summary: clang generates infinite loop at -O2
Product: libraries
Version: 3.7
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: daiwe...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Compiling this code on OSX using clang-3.7.0 with:
clang++ -c -O2 -std=c++11 -stdlib=libc++ -arch arm64 miscompile.cpp
results in code:
$ otool -tV miscompile.o | c++filt | grep -E "^0+([0-9a-f]+)\s+cbz.*\1$"
0000000000003700 cbz x12, 0x3700
inside of the function Object::copyArrayData. It appears that the inlined
protoHasArray method is causing this code to be generated.
This also happens when generating x86 code:
00000000000032b0 testq %rdi, %rdi
00000000000032b3 je 0x32b0
This doesn't happen with clang 3.6.2 or with a lower optimization level.
P.S.: Apologies for the giant input file. I couldn't find a way to reproduce
with a trivial example.
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