https://bugs.llvm.org/show_bug.cgi?id=33459
Bug ID: 33459
Summary: p static_cast<int16_t>(...) has inconsistent output
Product: lldb
Version: 3.9
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: vi...@nethacker.com
CC: llvm-b...@lists.llvm.org
(lldb) version
lldb version 3.9.0 ( revision )
(lldb) p r_sigma_float
(const float) $11 = 0.0500000007
(correct)
(lldb) p (1.0f / (2 * r_sigma_float * r_sigma_float)) * (1<<kQ)
(float) $3 = 51199.9961
(correct)
(lldb) p static_cast<int16_t>(51199.99f)
(int16_t) $1 = 32767
Technically, this is undefined but the output here matches what g++ does so I
think it's good. Clang current returns inconsistent results. Ideally, it
would be nice for lldb to print (undefined) or be consistent with whatever
compiler you are using. I'm hoping to get clang's behavior changed:
https://bugs.llvm.org/show_bug.cgi?id=33448
http://eel.is/c++draft/conv.fpint#1
(lldb) p static_cast<int16_t>((1.0f / (2 * r_sigma_float * r_sigma_float)) *
(1<<kQ))
(int16_t) $2 = -14337
Again this is undefined but it is inconsistent with the previous behavior so I
would call it a bug.
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