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[Bug fortran/34028] New: Type mismatch with optimization of ISHFT
- From: "fxcoudert at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Nov 2007 13:20:20 -0000
- Subject: [Bug fortran/34028] New: Type mismatch with optimization of ISHFT
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
Happens on x86-linux, with both -m32 and -m64. Spotted by running the testsuite
with -fdefault-integer-8.
$ cat intrinsic_bitops.f90
implicit none
integer(kind=4) :: k, o
o = 0
k = 12
if (ishft (k, o+2_8) .ne. 48_8) call abort
end
$ gfortran -O2 intrinsic_bitops.f90
intrinsic_bitops.f90: In function ?MAIN__?:
intrinsic_bitops.f90:1: error: type mismatch in comparison expression
logical4
int8
int4
if (D.864 <= 31)
{
if (o >= -2)
{
D.862 = (int8) o;
D.863 = D.862 + 2;
D.864 = ABS_EXPR <D.863>;
D.866 = k << D.864;
iftmp.2 = D.866 != 48;
}
else
{
k.3 = (<unnamed-unsigned:32>) k;
D.862 = (int8) o;
D.863 = D.862 + 2;
D.864 = ABS_EXPR <D.863>;
D.868 = k.3 >> D.864;
iftmp.2 = D.868 != 48;
}
iftmp.1 = iftmp.2;
}
else
{
iftmp.1 = 1;
}
intrinsic_bitops.f90:1: internal compiler error: verify_gimple failed
The tree dump is:
ABS_EXPR <(int8) o + 2> <= 31 ? o >= -2 ? k << ABS_EXPR <(int8) o + 2> != 48 :
(<unnamed-unsigned:32>) k >> ABS_EXPR <(int8) o + 2> != 48 : 1
The problem arises from the fact that 31 above is int4, while ABS_EXPR <(int8)
o + 2> is int8. The following patch fixes it:
Index: trans-intrinsic.c
===================================================================
--- trans-intrinsic.c (revision 129869)
+++ trans-intrinsic.c (working copy)
@@ -2533,7 +2533,7 @@ gfc_conv_intrinsic_ishft (gfc_se * se, g
/* The Fortran standard allows shift widths <= BIT_SIZE(I), whereas
gcc requires a shift width < BIT_SIZE(I), so we have to catch this
special case. */
- num_bits = build_int_cst (TREE_TYPE (args[0]), TYPE_PRECISION (type));
+ num_bits = build_int_cst (TREE_TYPE (args[1]), TYPE_PRECISION (type));
cond = fold_build2 (GE_EXPR, boolean_type_node, width, num_bits);
--
Summary: Type mismatch with optimization of ISHFT
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code, patch
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: fxcoudert at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34028