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[Bug fortran/35219] New: zdotu (copy of BLAS version) works in x86, x86_64, segfaults in arm.
- From: "akumar at ee dot iitm dot ac dot in" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 16 Feb 2008 18:39:58 -0000
- Subject: [Bug fortran/35219] New: zdotu (copy of BLAS version) works in x86, x86_64, segfaults in arm.
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
Hi!
The following programs are built like this:
gfortran -c zdotu.f -ggdb
g++ -c ztest.cpp -ggdb
g++ -o ztest zdotu.o ztest.o
The generated ztest segfaults on ARM on line 37 of zdotu.f with SIGSEGV, while
it is perfect on other arches.
Thanks!
Kumar
zdotu.f
-------
DOUBLE COMPLEX FUNCTION ZDOTU(N,ZX,INCX,ZY,INCY)
* .. Scalar Arguments ..
INTEGER INCX,INCY,N
* ..
* .. Array Arguments ..
DOUBLE COMPLEX ZX(*),ZY(*)
* ..
*
* Purpose
* =======
*
* ZDOTU forms the dot product of two vectors.
*
* Further Details
* ===============
*
* jack dongarra, 3/11/78.
* modified 12/3/93, array(1) declarations changed to array(*)
*
* .. Local Scalars ..
DOUBLE COMPLEX ZTEMP
INTEGER I,IX,IY
* ..
ZTEMP = (0.0d0,0.0d0)
ZDOTU = (0.0d0,0.0d0)
IF (N.LE.0) RETURN
IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
*
* code for unequal increments or equal increments
* not equal to 1
*
IX = 1
IY = 1
IF (INCX.LT.0) IX = (-N+1)*INCX + 1
IF (INCY.LT.0) IY = (-N+1)*INCY + 1
DO 10 I = 1,N
ZTEMP = ZTEMP + ZX(IX)*ZY(IY)
IX = IX + INCX
IY = IY + INCY
10 CONTINUE
ZDOTU = ZTEMP
RETURN
*
* code for both increments equal to 1
*
20 DO 30 I = 1,N
ZTEMP = ZTEMP + ZX(I)*ZY(I)
30 CONTINUE
ZDOTU = ZTEMP
RETURN
END
ztest.cpp
---------
#include <complex>
typedef std::complex<double> cdouble;
extern "C" {
cdouble zdotu_(const int *, const cdouble *, const int *,
const cdouble *, const int *);
}
int main() {
int incr = 1;
int size = 6;
cdouble a[] = {cdouble( 0.7219, 0.8871), cdouble( 0.7073,-0.7953),
cdouble( 0.2610, 0.4325), cdouble(-0.0565,-0.0719),
cdouble( 0.7277,-0.9754), cdouble(-0.3780, 1.0718)};
cdouble b[] = {cdouble(-0.0821,+0.8410), cdouble(-0.0749, 0.0729),
cdouble(-0.6094,-0.2975), cdouble( 0.2106,-0.2026),
cdouble( 0.1043,-0.8300), cdouble( 0.0806, 0.3698)};
cdouble x_ref(-2.01767031,-0.45861365);
cdouble x = zdotu_(&size, a, &incr, b, &incr);
return (std::abs(x - x_ref) < 1e-6) ? 0 : 1;
}
--
Summary: zdotu (copy of BLAS version) works in x86, x86_64,
segfaults in arm.
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: akumar at ee dot iitm dot ac dot in
GCC build triplet: arm-linux-gnu
GCC host triplet: arm-linux-gnu
GCC target triplet: arm-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35219