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981006-1.c: New test.

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* special/981006-1.c: New test.  Make sure gcc doesn't lose track of the
possible targets of tablejump insns.
* special/special.exp: Run it.

From-SVN: r22899
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Ken Raeburn 1998-10-07 18:26:06 +00:00 committed by Ken Raeburn
parent 5924eecfbc
commit 52db16fde4
3 changed files with 70 additions and 0 deletions
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6
gcc/testsuite/gcc.c-torture/ChangeLog
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@ -1,3 +1,9 @@
1998-10-06 Ken Raeburn <raeburn@cygnus.com>
* special/981006-1.c: New test. Make sure gcc doesn't lose track
of the possible targets of tablejump insns.
* special/special.exp: Run it.
Thu Oct 1 17:15:26 1998 Nick Clifton <nickc@cygnus.com>
* compile/981001-1.c: New test.

50
gcc/testsuite/gcc.c-torture/special/981006-1.c Normal file
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@ -0,0 +1,50 @@
/* Test that tablejump insns are correctly handled. If the compiler
loses track of the jump targets, it will report that x and y can be
used uninitialized.
This is broken in egcs 1998/10/06 for mips in pic mode. */
/* { dg-do compile } */
int foo (int a, int b)
{
__label__ z;
int x; /* { dg-bogus "warning: `.' might be used uninitialized in this function" } */
int y; /* { dg-bogus "warning: `.' might be used uninitialized in this function" } */
static void *p;
switch (a) {
case 2:
x = 4;
break;
case 4:
x = 6;
break;
case 8: case 10: case 13: case 11: case 17: case 19:
x = 7;
break;
default:
x = -1;
break;
}
switch (b) {
case 2:
y = 4;
break;
case 4:
y = 6;
break;
case 8: case 10: case 13: case 11: case 17: case 19:
y = 7;
break;
default:
y = -1;
break;
}
z:
p = &&z;
return x * y;
}
int main (int argc, char *argv[])
{
return 1 == foo (argc, argc + 1);
}

14
gcc/testsuite/gcc.c-torture/special/special.exp
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@ -34,6 +34,20 @@ load_lib gcc-dg.exp
################## ADD NEXT CASE HERE (NOT AT THE END) ##################
# 981006-1
# For MIPS at least, pic is needed to trigger the problem.
dg-init
if { [istarget rs6000-*-aix*]
|| [istarget powerpc*-*-aix*]
|| [istarget arm*-*-*]
} {
set extra_flags ""
} else {
set extra_flags "-fpic"
}
dg-runtest $srcdir/$subdir/981006-1.c "-Wuninitialized -O2 $extra_flags" ""
dg-finish
# 921210-1
set lines [gcc_target_compile $srcdir/$subdir/921210-1.c "" preprocess ""]
set lines [prune [split [prune_warnings [prune_gcc_output $lines]] "\n"] ""]