https://llvm.org/bugs/show_bug.cgi?id=31614
Bug ID: 31614
Summary: possible bad code generation
Product: clang
Version: 3.9
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: clay.tryc...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17832
--> https://llvm.org/bugs/attachment.cgi?id=17832&action=edit
repro
When compiling the attached code with -O2 -std=c++14 the generated assembly
seems to be incorrect (I tried to rule out undefined behavior, but if I missed
something please let me know).
Specifically, test_function starts with some code that seems like it can
randomly set al to 0 or 1 depending on rax:
test rax, rax
setns al
The other instance of test/setns also seems suspicious.
Some more details can be found here:
http://stackoverflow.com/questions/41597341/mapping-c-to-assembly
https://godbolt.org/g/ccrV7m
Please let me know if you need any other information.
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