[Bug testsuite/114222] New: gcc.c-torture/execute/builtin-bitops-1.c fails for H8/300

[Bug testsuite/114222] New: gcc.c-torture/execute/builtin-bitops-1.c fails for H8/300

[jdx at o2 dot pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114222

            Bug ID: 114222
           Summary: gcc.c-torture/execute/builtin-bitops-1.c fails for
                    H8/300
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jdx at o2 dot pl
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: h8300-elf

Excerpt from gcc.log:
[...]
Executing on host: /home/jdx/testgcc/builddir/gcc/xgcc
-B/home/jdx/testgcc/builddir/gcc/
/home/jdx/testgcc/combosrc/gcc/testsuite/gcc.c-torture/execute/builtin-bitops-1.c
   -fdiagnostics-plain-output    -O0  -w  -isystem
/home/jdx/testgcc/builddir/h8300-elf/./newlib/targ-include -isystem
/home/jdx/testgcc/combosrc/newlib/libc/include -L/home/jdx/testgcc/builddir/ld
-B/home/jdx/testgcc/builddir/h8300-elf/./newlib/
-L/home/jdx/testgcc/builddir/h8300-elf/./newlib  -lm  -o ./builtin-bitops-1.exe
   (timeout = 300)
spawn -ignore SIGHUP /home/jdx/testgcc/builddir/gcc/xgcc
-B/home/jdx/testgcc/builddir/gcc/
/home/jdx/testgcc/combosrc/gcc/testsuite/gcc.c-torture/execute/builtin-bitops-1.c
-fdiagnostics-plain-output -O0 -w -isystem
/home/jdx/testgcc/builddir/h8300-elf/./newlib/targ-include -isystem
/home/jdx/testgcc/combosrc/newlib/libc/include -L/home/jdx/testgcc/builddir/ld
-B/home/jdx/testgcc/builddir/h8300-elf/./newlib/
-L/home/jdx/testgcc/builddir/h8300-elf/./newlib -lm -o ./builtin-bitops-1.exe
PASS: gcc.c-torture/execute/builtin-bitops-1.c   -O0  (test for excess errors)
spawn /home/jdx/testgcc/builddir/sim/h8300/run ./builtin-bitops-1.exe
program stopped with signal 4 (Illegal instruction).
FAIL: gcc.c-torture/execute/builtin-bitops-1.c   -O0  execution test
[...]

Further investigation showed that:
 a) the test case fails at line 181, (most likely) inside __builtin_ffs();
other __builtins work as expected,
 b) it happens when the test case is compiled with default options, i.e. when
ints are 16 bit wide; when -mint32 is added to the options (i.e. ints are 32
bit wide), the test passes.

[Bug target/114222] gcc.c-torture/execute/builtin-bitops-1.c fails for H8/300

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114222

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|testsuite                   |target
           Keywords|                            |testsuite-fail, wrong-code

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
SIGILL looks like a target issue, but it might be also an emulator bug?

[Bug target/114222] gcc.c-torture/execute/builtin-bitops-1.c fails for H8/300

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114222

Jeffrey A. Law <law at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |law at gcc dot gnu.org

--- Comment #2 from Jeffrey A. Law <law at gcc dot gnu.org> ---
More likely the test is running out of address space.

The default linker script has a pretty small address space and the text will
commonly clash with the heap/stack.  Naturally that corrupts the text segment
causing all kinds of interesting problems -- worse yet, the problems are
intermittent as they depend on precisely what gets clobbered within the text
segment and what value ends up in the text segment.

The easiest way to check for that is throw the test into the debugger and run
it.  Assuming it faults, disassemble the instruction at the fault point.  Then
use objdump to disassemble the binary and see if the instruction has been
changed.