https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122018
Bug ID: 122018
Summary: x86 doesn't use bitmanip to both set and test bit
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: uis9936 at gmail dot com
Target Milestone: ---
Created attachment 62425
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62425&action=edit
Full testcase
x86 has instructions bt(bit test) and bts(bit test and set). As name suggests,
bts is equivalent to bt, but also sets bit. GCC can generate bt when the bit is
only tested, bts when bit is only set, but can't generate bts when bit is both
tested and set. It can be verified by commenting line 5 or 6 of provided
testcase.
