[Bug rtl-optimization/26945] [4.0/4.1 regression] Attempt to delete prologue/epilogue insn

[ted at midg3t dot net]

--- Comment #4 from ted at midg3t dot net  2006-07-06 09:38 ---
I came across a similar error, but because the test case attached to this
report did not trigger on my machine I filed a separate report, bug #28282. It
looks like it's probably related.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26945

[Bug rtl-optimization/28282] Attempt to delete prologue/epilogue insn, again

[ted at midg3t dot net]

--- Comment #3 from ted at midg3t dot net  2006-07-06 09:35 ---
For clarity, when not run via ccache the first line of the preprocessed source
output is:

// /usr/lib/gcc/i486-linux-gnu/4.1.2/cc1 -quiet bug.c -quiet -dumpbase bug.c
-mtune=i686 -auxbase bug -O1 -o - -frandom-seed=0


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28282

[Bug rtl-optimization/28282] Attempt to delete prologue/epilogue insn, again

[ted at midg3t dot net]

--- Comment #2 from ted at midg3t dot net  2006-07-06 09:29 ---
Created an attachment (id=11841)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11841&action=view)
Preprocessed source


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28282

[Bug rtl-optimization/28282] Attempt to delete prologue/epilogue insn, again

[ted at midg3t dot net]

--- Comment #1 from ted at midg3t dot net  2006-07-06 09:29 ---
Created an attachment (id=11840)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11840&action=view)
Test case


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28282

[Bug rtl-optimization/28282] New: Attempt to delete prologue/epilogue insn, again

[ted at midg3t dot net]

In a bit of code with an out-of-bounds array access, the following ICN is
triggered:

$ gcc -c -O1 bug.c
bug.c: In function ‘func’:
bug.c:12: error: Attempt to delete prologue/epilogue insn:
(insn/f 64 63 65 0 (set (mem:SI (plus:SI (reg/f:SI 6 bp)
(const_int -8 [0xfff8])) [0 S4 A8])
(reg:SI 3 bx)) -1 (nil)
(nil))
bug.c:12: internal compiler error: in propagate_one_insn, at flow.c:1699
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gcc.gnu.org/bugs.html> for instructions.
For Debian GNU/Linux specific bug reporting instructions,
see .
Preprocessed source stored into /tmp/ccEvY67W.out file, please attach this to
your bugreport.

This appears to be different from bug 26945 as the test case attached to it
does not trigger any error on my machine.

The test case is as follows:

int global;
int func(int argc) {
int* array[1];
array[1] = &global; /* out of bounds, of course */

if (something(array, argc))
otherfunc(array);

if (argc != 17)
return 17;
}

$ /usr/bin/gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v
--enable-languages=c,c++,java,fortran,objc,obj-c++,ada,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu
--enable-libstdcxx-debug --enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-4.1-1.4.2.0/jre --enable-mpfr
--with-tune=i686 --enable-checking=release i486-linux-gnu
Thread model: posix
gcc version 4.1.2 20060630 (prerelease) (Debian 4.1.1-6)


-- 
   Summary: Attempt to delete prologue/epilogue insn, again
   Product: gcc
   Version: 4.1.2
Status: UNCONFIRMED
  Severity: minor
  Priority: P3
 Component: rtl-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ted at midg3t dot net
 GCC build triplet: gcc version 4.1.2 20060630 (prerelease) (Debian 4.1.1-6)
GCC target triplet: i486-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28282