https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77681
Bug ID: 77681
Summary: failing to inline simple function when using -fgnu-tm
Product: gcc
Version: 6.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: pc at us dot ibm.com
Target Milestone: ---
Created attachment 39671
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39671&action=edit
testcase where always_inline fails with -fgnu-tm
I've used several different versions of GCC, including 4.8.5 and 6.2.1, on
different architectures (x86_64 and ppc64le).
I first noticed that a very simple "static inline" function was not being
inlined. When I added "__attribute__((always_inline))", an error was produced
(see below). In narrowing down the testcase, I also tried to narrow down the
command line, and discovered that the error is only produced when "-fgnu-tm" is
present. The narrowed-down testcase makes no use of transactional memory, so
there appears to be some inlining interference caused by "-fgnu-tm".
--
$ g++ -O3 -c always-inline.cpp -fgnu-tm -o /dev/null
always-inline.cpp: In member function ‘T* spsc<T>::pop() [with T = int]’:
always-inline.cpp:9:1: error: inlining failed in call to always_inline ‘void*
_ZL13SPHGetFreePtrPv.constprop.0()’:
SPHGetFreePtr (void *H) {
^
always-inline.cpp:19:32: error: called from here
T** p = (T**) SPHGetFreePtr(0);
$ g++ -O3 -c always-inline.cpp -o /dev/null
$
--
