http://llvm.org/bugs/show_bug.cgi?id=21173
Bug ID: 21173
Summary: stack protector generating sse3 instructions in
unoptimized 32-bit build
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
clang --version
echo 'void test() { char blah[127] = {}; }' | clang++ -g -m32 -xc++ -c -o
/tmp/blah1.o
echo 'void test() { char blah[127] = {}; }' | clang++ -g -fstack-protector-all
-Wstack-protector -m32 -xc++ -c -o /tmp/blah2.o
If you look at the disassembly for /tmp/blah{1,2}.o, the former generates some
instructions that are valid for any of the Pentium processors, whereas the
latter uses %xmm0 & movaps instructions to initialize `blah`.
Without really digging into it I can only speculate, but my best guess is stack
protector is potentially enabling one or more optimizations that would
otherwise not be enabled in a typical debug build w/out optimizations.
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