http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48616
Summary: -ftree-vectorize -mxop miscompiles right shift
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: [email protected]
ReportedBy: [email protected]
Created attachment 23991
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23991
reduced testcase
I just tested GCC 4.6 with -mxop and found that my testShift unit test is
miscompiled. I tried hard to reduce the testcase further than what I got now,
but it is very fragile, i.e. it produces correct code if I remove unrelated
code, such as test calls after the problematic test.
Compile the testcase with
% g++ -mxop -O2 -ftree-vectorize testcase.cpp
to get the error.
Let me know if I can help further.
