[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
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On 2012-02-17T09:57:34+00:00 Bernhard Rosenkraenzer wrote:
Created attachment 26693
Preprocessed source triggering this issue
[bero@localhost ~]$ /opt/android-toolchain-4.7/bin/arm-linux-androideabi-g++
-mcpu=cortex-a9 -mthumb -Os -o agc2_amr_wb.o -c agc2_amr_wb.i
/tmp/ccBg0Qr8.s: Assembler messages:
/tmp/ccBg0Qr8.s:110: Error: branch out of range
The problem disappears when taking out -mcpu=cortex-a9 or replacing -Os
with any other optimization level.
Reproducable with arm-linux-androideabi, arm-eabi and arm-linux-gnueabi
compilers.
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/7
On 2012-02-17T10:46:11+00:00 Mikpe wrote:
Fails with gcc 4.7 but works with 4.6, 4.5, and 4.4.
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/8
On 2012-02-17T23:22:41+00:00 Rearnsha wrote:
Confirmed.
lsls Rd, Rn, Rm
is only 2 bytes in size if Rd == Rn
Although the testcase only fails on trunk, the miscalculation is certain
to be present on all maintained branches.
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/9
On 2012-02-18T12:27:50+00:00 stevenb wrote:
Richard, I suppose you mean the problem is in this define_insn:
(define_insn "*thumb1_ashlsi3"
[(set (match_operand:SI0 "register_operand" "=l,l")
(ashift:SI (match_operand:SI 1 "register_operand" "l,0")
(match_operand:SI 2 "nonmemory_operand" "N,l")))]
"TARGET_THUMB1"
"lsl\\t%0, %1, %2"
[(set_attr "length" "2")
(set_attr "conds" "set")])
which should set "length" depending on the operands?
(BTW when should ARM_LSL_NAME be used instead of "lsl"? Or is
ARM_LSL_NAME not relevant for Thumb?)
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/10
On 2012-02-18T12:36:29+00:00 stevenb wrote:
(If the pattern of comment #3 is to blame, then this goes back all the
way to the check-in of that pattern, see
http://gcc.gnu.org/viewcvs?view=revision&revision=33028)
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/11
On 2012-02-18T12:46:00+00:00 stevenb wrote:
(In reply to comment #4)
> (If the pattern of comment #3 is to blame, then this ...
...probably fix it.
Index: arm.md
===
--- arm.md (revision 184318)
+++ arm.md (working copy)
@@ -3505,7 +3505,12 @@
(match_operand:SI 2 "nonmemory_operand" "N,l")))]
"TARGET_THUMB1"
"lsl\\t%0, %1, %2"
- [(set_attr "length" "2")
+ [(set (attr "length")
+ (if_then_else
+(eq (symbol_ref ("which_alternative"))
+(const_int 0))
+(const_int 4)
+(const_int 2)))
(set_attr "conds" "set")])
(define_expand "ashrdi3"
And otherwise: sorry for all the noise :-)
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/12
On 2012-02-18T12:47:20+00:00 stevenb wrote:
Or better:
Index: arm.md
===
--- arm.md (revision 184318)
+++ arm.md (working copy)
@@ -3505,7 +3505,7 @@
(match_operand:SI 2 "nonmemory_operand" "N,l")))]
"TARGET_THUMB1"
"lsl\\t%0, %1, %2"
- [(set_attr "length" "2")
+ [(set_attr "length" "4,2")
(set_attr "conds" "set")])
(define_expand "ashrdi3"
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/13
On 2012-02-18T15:25:01+00:00 Rearnsha wrote:
(In reply to comment #3)
> Richard, I suppose you mean the problem is in this define_insn:
>
> (define_insn "*thumb1_ashlsi3"
> [(set (match_operand:SI0 "register_operand" "=l,l")
> (ashift:SI (match_operand:SI 1 "register_operand" "l,0")
>(match_operand:SI 2 "nonmemory_operand" "N,l")))]
> "TARGET_THUMB1"
> "lsl\\t%0, %1, %2"
> [(set_attr "length" "2")
>(set_attr "conds" "set")])
No, that pattern is only for Thumb1, it never applies to Thumb2.
I'm currently testing a fix
Reply at: https://bugs.launchpad.net/gcc/+bug/926855/comments/14
On 2012-02-21T15:38:40+00:0
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
** Changed in: gcc-linaro Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
** Also affects: gcc via http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52294 Importance: Unknown Status: Unknown ** Changed in: gcc-linaro Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
I can confirm 4.6.2-16ubuntu1, uploaded Thu, 23 Feb 2012 19:39:11 +0100 fixes the problem : I can compile sage without compiler problems! Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
Assigning to Andrew as it will be picked up with the next merge. ** Changed in: gcc-linaro Status: Triaged => In Progress ** Changed in: gcc-linaro Assignee: (unassigned) => Andrew Stubbs (ams-codesourcery) ** Changed in: gcc-linaro Milestone: None => 4.6-2012.03 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
fixed in 4.6.2-16ubuntu1 ** Changed in: gcc-4.6 (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
This ticket appears to be the same as: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52294. a case where gcc generates a cbz instruction that ends up trying to reach too far. Attaching the assembly file mp.s generated with: asa-san@ursa4:~/bugs/mp$ /scratch/asa-san/cbuild/slaves/ursa4/gcc-linaro-4.6-2012.01/gcc-binary/bin/gcc -c -o mp.o mp.c -O3 -funroll-loops -save-temps -dp mp.s: Assembler messages: mp.s:116: Error: branch out of range mp.s:343: Error: branch out of range The patch by Richard Earnshaw affects the pattern *thumb2_shiftsi3_short in the backend. Looking into mp.s, there are a lot of instructions that were generated from this pattern by the compiler. lslsr3, r3, #2 @ 426 *thumb2_shiftsi3_short [length = 2] The patch will become availabel in gcc-linaro-4.6 on the nextmerge from FSF trunk. and that should solve this issue. ** Bug watch added: GCC Bugzilla #52294 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52294 ** Attachment added: "mp.s.tar.xz" https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/926855/+attachment/2778566/+files/mp.s.tar.xz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
Hi Michael, I cant' find any "asm" chunks in there. (Only in some external declarations.) Can it look any other way? /Åsa On 15 February 2012 22:39, Michael Hope <926...@bugs.launchpad.net> wrote: > Asa, does the code contain any inline assembly? GCC estimates the size > of each instruction and uses that to decide if it can use a short or a > long branch. Long chunks of inline assembly can break that and make it > think the code is shorter than it is. > > -- > You received this bug notification because you are a member of Linaro > Toolchain Developers, which is subscribed to Linaro GCC. > https://bugs.launchpad.net/bugs/926855 > > Title: > [ARMhf] gcc produces assembler it can't compile > > Status in Linaro GCC: > Triaged > Status in “gcc-4.6” package in Ubuntu: > Confirmed > > Bug description: > I'm porting the sagemath software to ARM. I completed the port with > ubuntu oneiric. > > I upgraded to (a snapshot of) precise, and now a single file in the > whole project doesn't build anymore. > > Hence something has been broken from oneiric/armel to precise/armhf. > > The attached mp.c is a "gcc -E" version of the problematic file, so it > allows to easily reproduce the issue without fuss : if you compile it > with "gcc -c -o mp.o mp.c -O3 -funroll-loops", then the assembler will > find two cases of "branch out of range". Other switch combinations > don't give problems, and the same combination is ok on x86_64 for > example. > > Ah, on precise the gcc version is the one of Fri, 20 Jan 2012 12:10:59 > +100 uploaded by doko, and changelog "Merge with debian". > > There's no problem giving more details or doing tests if you want. > > To manage notifications about this bug go to: > https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
Asa, does the code contain any inline assembly? GCC estimates the size of each instruction and uses that to decide if it can use a short or a long branch. Long chunks of inline assembly can break that and make it think the code is shorter than it is. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
Thank you for the bug report. I've confirmed this with gcc- linaro-4.6-2012.01 on ARM: asa-san@ursa4:~/bugs/mp$ /scratch/asa-san/cbuild/slaves/ursa4/gcc-linaro-4.6-2012.01/gcc-binary/bin/gcc -c -o mp.o mp.c -O3 -funroll-loops /tmp/ccv0lfQ5.s: Assembler messages: /tmp/ccv0lfQ5.s:116: Error: branch out of range /tmp/ccv0lfQ5.s:343: Error: branch out of range The work around is to compiler at -O1 or to remove the -funroll-loops flag. The fault does not exist in FSF gcc-4.5.3 or gcc-4.6.2 Neither does it exist on gcc-linaro-4.5-2012.01. The fault exists in gcc 4.7 (r183205). The fault was introduced in gcc-linaro-4.6-2011.09. I've set it to low priority as it is a ftbfs, there is a work-around, and the fault exists upstream. ** Changed in: gcc-linaro Status: New => Triaged ** Changed in: gcc-linaro Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
** Also affects: gcc-linaro Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/gcc-linaro/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
I can reproduce this on precise (armel & armhf). ubuntu@panda2:~/test$ gcc -c -o mp.o mp.c -O3 -funroll-loops /tmp/ccSVzO5N.s: Assembler messages: /tmp/ccSVzO5N.s:202: Error: branch out of range /tmp/ccSVzO5N.s:4145: Error: branch out of range ubuntu@panda2:~/test$ gcc -c -o mp.o mp.c -O3 -funroll-loops -marm ubuntu@panda2:~/test$ ** Changed in: gcc-4.6 (Ubuntu) Status: New => Confirmed ** Changed in: gcc-4.6 (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
** Tags added: armel armhf precise -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
The file compiles with "-O3 -funroll-loops -marm" (someone suggested I try) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 926855] Re: [ARMhf] gcc produces assembler it can't compile
** Attachment added: "Example problematic file" https://bugs.launchpad.net/bugs/926855/+attachment/2714685/+files/mp.c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/926855 Title: [ARMhf] gcc produces assembler it can't compile To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/926855/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
