GCC ICE on arm/xscale

[Khem Raj]

Attached testcase reproduces a gcc ICE when compiled with -O2 -mtune=xscale

If r99475 is reverted then the ICE goes away

[Chung-Lin Tang (cltang)]

I cannot reproduce an ICE, on my machine the compiler goes into an infinite loop... :P

There's obviously something wrong though.
Khem, what version of GCC was the build compiler? Was this on i686 or x86_64?
(I'll see if I can reproduce this)

[Khem Raj (khem-raj)]

Yes exactly it runs for a while here too and eventually dumps the core.If I replace line arm.c:10117 in
arm_gen_load_multiple_1()
  if (low_irq_latency || (arm_tune_xscale && count <= 2 && ! optimize_size))
with

if (low_irq_latency)

It starts to work again and compiles instantly

build is done on natty/x86_64 box. which has gcc 4.5.2

[Chung-Lin Tang (cltang)]

Found it, I think this is: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45177
Backport in progress.

[Khem Raj (khem-raj)]

yes I verified that this patch indeed fixes the problem

[Andrew Stubbs (ams-codesourcery)]

Chung-Lin's has now been committed to Linaro GCC 4.5.

[Andrew Stubbs (ams-codesourcery)]

This patch is backported from upstream.

[Andrew Stubbs (ams-codesourcery)]

Related: lp:gcc-linaro/4.5,revno=99479

[Launchpad Janitor (janitor)]

This bug was fixed in the package gcc-4.5 - 4.5.2-5ubuntu1

---------------
gcc-4.5 (4.5.2-5ubuntu1) natty; urgency=low

  * For the natty release, do not pass --as-needed by default to the linker.
    The --as-needed flag will be default again for the o-series.

gcc-4.5 (4.5.2-5) unstable; urgency=low

  * Update to SVN 20110305 (r170696) from the gcc-4_5-branch.
    - Fix PR target/43810, PR fortran/47886, PR tree-optimization/47615,
      PR middle-end/47639, PR tree-optimization/47890, PR libfortran/47830,
      PR tree-optimization/46723, PR target/45261, PR target/45808,
      PR c++/46159, PR c++/47904, PR fortran/47886, PR libstdc++/47433,
      PR target/42240, PR fortran/47878, PR libfortran/47694.
  * Update the Linaro support to the 4.5-2011.03-0 release.
    - Fix LP: #705689, LP: #695302, LP: #710652, LP: #710623, LP: #721021,
      LP: #721021, LP: #709453.

gcc-4.5 (4.5.2-4) unstable; urgency=low

  * Update to SVN 20110222 (r170382) from the gcc-4_5-branch.
    - Fix PR target/43653, PR fortran/47775, PR target/47840,
      PR libfortran/47830.

  [ Matthias Klose ]
  * Don't apply a patch twice.
  * Build libgcc_s with -fno-stack-protector, when not building from the
    Linaro branch.
  * Backport proposed fix for PR tree-optimization/46723 from the trunk.

  [ Steve Langasek ]
  * debian/control.m4: add missing Multi-Arch: same for libgcc4; make sure
    Multi-Arch: same doesn't get set for libmudflap when building an
    Architecture: all cross-compiler package.
  * debian/rules2: use $libdir for libiberty.a.
  * debian/patches/gcc-multiarch-*.diff: make sure we're using the same
    set_multiarch_path definition for all variants.

  [ Sebastian Andrzej Siewior ]
  * PR target/44364
  * Remove -many on powerpcspe (__SPE__)
  * Remove classic FPU opcodes from libgcc if target has no support for them
    (powerpcspe)
 -- Matthias Klose <email address hidden> Sun, 06 Mar 2011 12:22:47 +0100