[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 Andrew Pinski changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||FIXED Target Milestone|--- |4.6.0 --- Comment #10 from Andrew Pinski 2011-12-15 01:53:39 UTC --- Fixed in 4.6.0 from reading the comments.
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 Iain Sandoe changed: What|Removed |Added CC||iains at gcc dot gnu.org --- Comment #9 from Iain Sandoe 2010-12-21 13:12:53 UTC --- (In reply to comment #8) > (In reply to comment #7) > > (In reply to comment #6) > > > I think enumtls has been fixed on the trunk with respect of > > > fsection-anchors. > > > Can you try the trunk? > > > > Yes, looks like this bug is fixed in trunk. Assembly output looks sane. I > > will > > see if it works on real hardware some time later today. Do you know svn > > revision it got fixed? > > No but the change was done by Iain Sandoe to fix enum TLS with LTO on darwin. The fix to emuTLS on trunk is from Richard Henderson's new implementation. http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162549 I made some fixes to LTO-compatibility and Section anchors, but they primarily affect ObjC* and PPC-darwin, so likely not relevant to your case.
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 --- Comment #8 from Andrew Pinski 2010-12-20 16:51:29 UTC --- (In reply to comment #7) > (In reply to comment #6) > > I think enumtls has been fixed on the trunk with respect of > > fsection-anchors. > > Can you try the trunk? > > Yes, looks like this bug is fixed in trunk. Assembly output looks sane. I will > see if it works on real hardware some time later today. Do you know svn > revision it got fixed? No but the change was done by Iain Sandoe to fix enum TLS with LTO on darwin.
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 --- Comment #7 from Paulius Zaleckas 2010-12-20 11:28:14 UTC --- (In reply to comment #6) > I think enumtls has been fixed on the trunk with respect of fsection-anchors. > Can you try the trunk? Yes, looks like this bug is fixed in trunk. Assembly output looks sane. I will see if it works on real hardware some time later today. Do you know svn revision it got fixed?
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 --- Comment #6 from Andrew Pinski 2010-12-19 21:53:14 UTC --- I think enumtls has been fixed on the trunk with respect of fsection-anchors. Can you try the trunk?
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 --- Comment #5 from Paulius Zaleckas 2010-12-19 19:39:07 UTC --- Did some testing through various GCC versions: 4.5.2 - buggy 4.4.5 - buggy 4.3.5 - OK, but does not have -fsection-anchors optimization for ARM
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 --- Comment #4 from Paulius Zaleckas 2010-12-19 16:07:15 UTC --- Created attachment 22823 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22823 diff with and without -fsection-anchors I have found out that it is -fsection-anchors optimization causing this bug. Attached -S assembler output diff with and without this option.
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 --- Comment #3 from Paulius Zaleckas 2010-12-16 20:11:54 UTC --- (In reply to comment #2) > So I suspect the issue is dependent on emutls or uclibc. Yes, you are right. I have experimented today with few toolchains and build few variants myself and I have discovered that gcc has to be built with --disable-tls configure option to reproduce this bug.
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 Mikael Pettersson changed: What|Removed |Added CC||mikpe at it dot uu.se --- Comment #2 from Mikael Pettersson 2010-12-16 09:14:33 UTC --- The test case works for me on armv5tel-linux-gnueabi with gcc 4.4, 4.5, and 4.6. Comparing your assemby code with mine I see that your calls __emutls_get_address while mine calls __aeabi_read_tp, and the section allocation for .LANCHOR0 is different (your is in .bss, mine is in .section .tdata,"awT",%progbits). So I suspect the issue is dependent on emutls or uclibc.
[Bug target/46972] __thread storage class variable gets optimized out on ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46972 --- Comment #1 from Paulius Zaleckas 2010-12-15 21:14:16 UTC --- Created attachment 22776 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22776 assembler This is what I get with gcc's -S -fverbose-asm
