https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99823
Bug ID: 99823
Summary: -funroll-all-loops bugs when using contexpr variable
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ustcw0ng at mail dot ustc.edu.cn
Target Milestone: ---
Created attachment 50483
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50483&action=edit
constexpr.cpp && unroll.cpp
-funroll-all-loops indicates "Unroll all loops, even if their number of
iterations is uncertain when the loop is entered. This usually makes programs
run more slowly.". But in the following example constexpr.cpp can never turn to
unroll.cpp, even if number of iterations is certain due to constexpr.
compiler flag: -O3 -std=c++2a -DNDEBUG -funroll-all-loops
