ICE building perl w/ -marm

Created attachment 25022
preprocessed sources (ust-0.15/snprintf/vfprintf.c)

$ arm-linux-gnueabi-gcc -march=armv7-a /tmp/x2.c -c -O1
/tmp/x2.c: In function ‘ust_safe_vfprintf’:
/tmp/x2.c:4533:1: error: unrecognizable insn:
(insn 3114 3113 3115 139 (set (subreg:SI (reg/v:DI 153 [ _umax ]) 0)
        (sign_extend:SI (mem:QI (plus:SI (mult:SI (reg/v:SI 159 [ nextarg ])
                        (const_int 8 [0x8]))
                    (reg/f:SI 347 [ argtable.7 ])) [0 *D.5277_569+0 S1 A32]))) /tmp/x2.c:4325 -1
     (nil))
/tmp/x2.c:4533:1: internal compiler error: in extract_insn, at recog.c:2113
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

$ arm-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=arm-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=$P/sysroots/x86_64-oe-linux/usr/libexec/armv5te-linux-gnueabi/gcc/arm-linux-gnueabi/4.6.1/lto-wrapper
Target: arm-linux-gnueabi
Configured with: $P/work-shared/gcc-4.6.1+svnr175454/gcc-4_6-branch/configure --build=x86_64-oe-linux --host=x86_64-oe-linux --target=arm-linux-gnueabi --prefix=$P/sysroots/x86_64-oe-linux/usr --exec_prefix=$P/sysroots/x86_64-oe-linux/usr --bindir=$P/sysroots/x86_64-oe-linux/usr/bin/armv5te-linux-gnueabi --sbindir=$P/sysroots/x86_64-oe-linux/usr/bin/armv5te-linux-gnueabi --libexecdir=$P/sysroots/x86_64-oe-linux/usr/libexec/armv5te-linux-gnueabi --datadir=$P/sysroots/x86_64-oe-linux/usr/share --sysconfdir=$P/sysroots/x86_64-oe-linux/etc --sharedstatedir=$P/sysroots/x86_64-oe-linux/com --localstatedir=$P/sysroots/x86_64-oe-linux/var --libdir=$P/sysroots/x86_64-oe-linux/usr/lib/armv5te-linux-gnueabi --includedir=$P/sysroots/x86_64-oe-linux/usr/include --oldincludedir=$P/sysroots/x86_64-oe-linux/usr/include --infodir=$P/sysroots/x86_64-oe-linux/usr/share/info --mandir=$P/sysroots/x86_64-oe-linux/usr/share/man --disable-silent-rules --with-libtool-sysroot=$P/sysroots/x86_64-oe-linux --with-gnu-ld --enable-shared --enable-languages=c,c++ --enable-threads=posix --disable-multilib --enable-c99 --enable-long-long --enable-symvers=gnu --enable-libstdcxx-pch --program-prefix=arm-linux-gnueabi- --enable-target-optspace --enable-lto --enable-libssp --disable-bootstrap --disable-libgomp --disable-libmudflap --enable-cheaders=c_global --with-abi=aapcs-linux --with-float=soft --with-local-prefix=$P/sysroots/toradex-colibri320/usr --with-gxx-include-dir=/usr/include/c++ --with-sysroot=$P/sysroots/toradex-colibri320 --with-build-sysroot=$P/sysroots/toradex-colibri320 --enable-poison-system-directories --with-headers=$P/sysroots/toradex-colibri320/usr/include --disable-libunwind-exceptions --with-mpfr=$P/sysroots/x86_64-oe-linux/usr --with-system-zlib --enable-nls --enable-__cxa_atexit --enable-__cxa_atexit
Thread model: posix
gcc version 4.6.1 20110627 (prerelease) (GCC)

(it is the gcc-4.6 from OpenEmbedded Core)

I can reproduce the ICE with 4.7-20110813 and 4.6-20110812, but not with 4.5-20110804, 4.4-20110719, or 4.3.5.

It's caused by r163935:

Author: bernds
Date: Mon Sep 6 22:32:26 2010
New Revision: 163935

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=163935
Log:
 PR target/43137
 * config/arm/iterators.md (qhs_zextenddi_cond, qhs_sextenddi_cond):
 New define_mode_attrs.
 * config/arm/arm.md (zero_extendsidi2, arm_zero_extendsidi2,
 arm_exxtendsidi2, arm_extendsidi2): Delete patterns.
 (zero_extend<mode>di2, extend<mode>di2 and related splits): New.
 (thumb1_zero_extendhisi2): Remove code to handle LABEL_REFs.
 Remove pool_range attribute.
 (arm_zero_extendhisi2, arm_zero_extendhisi2_v6, arm_zero_extendqisi2,
 arm_zero_extendqisi2_v6, thumb1_zero_extendqisi2_v6): Remove
 pool_range and neg_pool_range attributes.
 * config/arm/thumb2.md (thumb2_zero_extendsidi2,
 thumb2_zero_extendhidi2, thumb2_zero_extendqidi2, thumb2_extendsidi2,
 thumb2_extendhidi2, thumb2_extendqidi2): Delete.

*** Bug 50104 has been marked as a duplicate of this bug. ***

Created attachment 25031
reduced test case

I can reproduce it with GCC 4.7 r177601 with -marm but not with -mthumb.
Here a smaller test case that seems related.

> cat tst2.c

typedef signed char int8_t ;
typedef signed short int16_t;
typedef signed long int32_t;
typedef signed long long int64_t;

// doesn't ice if arg is unsigned
// doesn't ice if return is int32_t instead of int64_t
int64_t foo(int8_t * arg)
{
  //int64_t temp_1;
  int64_t temp_1;

  temp_1 = arg[256]; // index must be > 255 to ice!
  return temp_1;
}

> arm-none-eabi-gcc -O1 tst2.c

tst2.c: In function 'foo':
tst2.c:15:1: error: unrecognizable insn:
(insn 22 21 23 2 (set (subreg:SI (reg:DI 138 [ MEM[(int8_t *)arg_1(D) + 256B] ]) 0)
        (sign_extend:SI (mem:QI (plus:SI (reg:SI 0 r0 [ arg ])
                    (const_int 256 [0x100])) [0 MEM[(int8_t *)arg_1(D) + 256B]+0 S1 A8]))) tst2.c:13 -1
     (nil))
tst2.c:15:1: internal compiler error: in extract_insn, at recog.c:2115

-- Greta

Seen also when building perl with -marm:
 https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/838994

Exists in 4.6.1 and trunk r178025. Does not exist in 4.5.3.

arm_legitimate_index_p() seems to be wrong. Near the end it has:

  /* For ARM v4 we may be doing a sign-extend operation during the
     load. */
  if (arm_arch4)
    {
      if (mode == HImode
   || mode == HFmode
   || (outer == SIGN_EXTEND && mode == QImode))
 range = 256;
      else
 range = 4096;
    }
  else
    range = (mode == HImode || mode == HFmode) ? 4095 : 4096;

The final 4096 range is incorrect for ARM mode sign extends. The arm_arch4 path looks good.

Created attachment 25202
Candidate patch

Oh fun - I posted a patch about 2 hours after you put yours here :)

Ramana

Author: ramana
Date: Fri Sep 30 09:36:43 2011
New Revision: 179378

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179378
Log:

Fix PR target/50099

Added:
    trunk/gcc/testsuite/gcc.target/arm/pr50099.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/arm/arm.md
    trunk/gcc/config/arm/iterators.md
    trunk/gcc/config/arm/predicates.md
    trunk/gcc/testsuite/ChangeLog

*** Bug 52855 has been marked as a duplicate of this bug. ***

*** Bug 54473 has been marked as a duplicate of this bug. ***

*** Bug 260998 has been marked as a duplicate of this bug. ***
Seen from the domain http://volichat.com
Page where seen: http://volichat.com/adult-chat-rooms
Marked for reference. Resolved as fixed @bugzilla.

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