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re PR fortran/35756 (incorrect WHERE for functions in ELSEWHERE and overlaps) 

2008-05-16  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/35756
	PR fortran/35759
	* trans-stmt.c (gfc_trans_where): Tighten up the dependency
	check for calling gfc_trans_where_3.

	PR fortran/35743
	* trans-stmt.c (gfc_trans_where_2): Set the mask size to zero
	if it is calculated to be negative.

	PR fortran/35745
	* trans-stmt.c (gfc_trans_where_3, gfc_trans_where_assign): Set
	ss->where for scalar right hand sides.
	* trans-array.c (gfc_add_loop_ss_code): If ss->where is set do
	not evaluate scalars outside the loop.  Clean up whitespace.
	* trans.h : Add a bitfield 'where' to gfc_ss.

2008-05-16  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/35756
	PR fortran/35759
	* gfortran.dg/where_1.f90: New test.

	PR fortran/35743
	PR fortran/35745
	* gfortran.dg/where_2.f90: New test.

From-SVN: r135443
parent a4cd1610
Showing with 170 additions and 20 deletions
gcc/fortran/ChangeLog
2008-05-16 Paul Thomas <pault@gcc.gnu.org>
PR fortran/35756
PR fortran/35759
* trans-stmt.c (gfc_trans_where): Tighten up the dependency
check for calling gfc_trans_where_3.
PR fortran/35743
* trans-stmt.c (gfc_trans_where_2): Set the mask size to zero
if it is calculated to be negative.
PR fortran/35745
* trans-stmt.c (gfc_trans_where_3, gfc_trans_where_assign): Set
ss->where for scalar right hand sides.
* trans-array.c (gfc_add_loop_ss_code): If ss->where is set do
not evaluate scalars outside the loop. Clean up whitespace.
* trans.h : Add a bitfield 'where' to gfc_ss.
2008-05-16 Tobias Burnus <burnus@net-b.de>
* libgfortran.h: Increase GFC_MAX_DIMENSIONS to 15.
......
gcc/fortran/trans-array.c
......@@ -1900,20 +1900,21 @@ gfc_add_loop_ss_code (gfc_loopinfo * loop, gfc_ss * ss, bool subscript)
/* Scalar expression. Evaluate this now. This includes elemental
dimension indices, but not array section bounds. */
gfc_init_se (&se, NULL);
gfc_conv_expr (&se, ss->expr);
gfc_add_block_to_block (&loop->pre, &se.pre);
gfc_conv_expr (&se, ss->expr);
gfc_add_block_to_block (&loop->pre, &se.pre);
if (ss->expr->ts.type != BT_CHARACTER)
{
/* Move the evaluation of scalar expressions outside the
scalarization loop. */
if (subscript)
se.expr = convert(gfc_array_index_type, se.expr);
se.expr = gfc_evaluate_now (se.expr, &loop->pre);
gfc_add_block_to_block (&loop->pre, &se.post);
}
else
gfc_add_block_to_block (&loop->post, &se.post);
if (ss->expr->ts.type != BT_CHARACTER)
{
/* Move the evaluation of scalar expressions outside the
scalarization loop, except for WHERE assignments. */
if (subscript)
se.expr = convert(gfc_array_index_type, se.expr);
if (!ss->where)
se.expr = gfc_evaluate_now (se.expr, &loop->pre);
gfc_add_block_to_block (&loop->pre, &se.post);
}
else
gfc_add_block_to_block (&loop->post, &se.post);
ss->data.scalar.expr = se.expr;
ss->string_length = se.string_length;
......
gcc/fortran/trans-stmt.c
......@@ -3150,6 +3150,7 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
{
/* The rhs is scalar. Add a ss for the expression. */
rss = gfc_get_ss ();
rss->where = 1;
rss->next = gfc_ss_terminator;
rss->type = GFC_SS_SCALAR;
rss->expr = expr2;
......@@ -3312,6 +3313,7 @@ gfc_trans_where_2 (gfc_code * code, tree mask, bool invert,
gfc_code *cblock;
gfc_code *cnext;
tree tmp;
tree cond;
tree count1, count2;
bool need_cmask;
bool need_pmask;
......@@ -3377,6 +3379,13 @@ gfc_trans_where_2 (gfc_code * code, tree mask, bool invert,
size = compute_overall_iter_number (nested_forall_info, inner_size,
&inner_size_body, block);
/* Check whether the size is negative. */
cond = fold_build2 (LE_EXPR, boolean_type_node, size,
gfc_index_zero_node);
size = fold_build3 (COND_EXPR, gfc_array_index_type, cond,
gfc_index_zero_node, size);
size = gfc_evaluate_now (size, block);
/* Allocate temporary for WHERE mask if needed. */
if (need_cmask)
cmask = allocate_temp_for_forall_nest_1 (mask_type, size, block,
......@@ -3578,6 +3587,7 @@ gfc_trans_where_3 (gfc_code * cblock, gfc_code * eblock)
if (tsss == gfc_ss_terminator)
{
tsss = gfc_get_ss ();
tsss->where = 1;
tsss->next = gfc_ss_terminator;
tsss->type = GFC_SS_SCALAR;
tsss->expr = tsrc;
......@@ -3595,6 +3605,7 @@ gfc_trans_where_3 (gfc_code * cblock, gfc_code * eblock)
if (esss == gfc_ss_terminator)
{
esss = gfc_get_ss ();
esss->where = 1;
esss->next = gfc_ss_terminator;
esss->type = GFC_SS_SCALAR;
esss->expr = esrc;
......@@ -3709,19 +3720,28 @@ gfc_trans_where (gfc_code * code)
block is dependence free if cond is not dependent on writes
to x1 and x2, y1 is not dependent on writes to x2, and y2
is not dependent on writes to x1, and both y's are not
dependent upon their own x's. */
dependent upon their own x's. In addition to this, the
final two dependency checks below exclude all but the same
array reference if the where and elswhere destinations
are the same. In short, this is VERY conservative and this
is needed because the two loops, required by the standard
are coalesced in gfc_trans_where_3. */
if (!gfc_check_dependency(cblock->next->expr,
cblock->expr, 0)
&& !gfc_check_dependency(eblock->next->expr,
cblock->expr, 0)
&& !gfc_check_dependency(cblock->next->expr,
eblock->next->expr2, 0)
eblock->next->expr2, 1)
&& !gfc_check_dependency(eblock->next->expr,
cblock->next->expr2, 1)
&& !gfc_check_dependency(cblock->next->expr,
cblock->next->expr2, 1)
&& !gfc_check_dependency(eblock->next->expr,
cblock->next->expr2, 0)
eblock->next->expr2, 1)
&& !gfc_check_dependency(cblock->next->expr,
cblock->next->expr2, 0)
eblock->next->expr, 0)
&& !gfc_check_dependency(eblock->next->expr,
eblock->next->expr2, 0))
cblock->next->expr, 0))
return gfc_trans_where_3 (cblock, eblock);
}
}
......
gcc/fortran/trans.h
......@@ -201,8 +201,9 @@ typedef struct gfc_ss
/* This is used by assignments requiring temporaries. The bits specify which
loops the terms appear in. This will be 1 for the RHS expressions,
2 for the LHS expressions, and 3(=1|2) for the temporary. */
unsigned useflags:2;
2 for the LHS expressions, and 3(=1|2) for the temporary. The bit
'where' suppresses precalculation of scalars in WHERE assignments. */
unsigned useflags:2, where:1;
}
gfc_ss;
#define gfc_get_ss() gfc_getmem(sizeof(gfc_ss))
......
gcc/testsuite/ChangeLog
2008-05-16 Paul Thomas <pault@gcc.gnu.org>
PR fortran/35756
PR fortran/35759
* gfortran.dg/where_1.f90: New test.
PR fortran/35743
PR fortran/35745
* gfortran.dg/where_2.f90: New test.
2008-05-16 Tobias Burnus <burnus@net-b.de>
* gfortran.dg/rank_1.f90
......
gcc/testsuite/gfortran.dg/where_1.f90 0 → 100644
! { dg-do run }
! Tests the fix for PR35759 and PR35756 in which the dependencies
! led to an incorrect use of the "simple where", gfc_trans_where_3.
!
! Contributed by Dick Hendrickson <dick.hendrickson@gmail.com>
!
logical :: la(6) = (/(2*(i/2) /= i, i = 1, 6)/), lb(6)
CALL PR35759
CALL PR35756
!
! The first version of the fix caused this to regress as pointed
! out by Dominique d'Humieres
!
lb = la
where(la)
la = .false.
elsewhere
la = .true.
end where
if (any(la .eqv. lb)) call abort()
CONTAINS
subroutine PR35759
integer UDA1L(6)
integer :: UDA1R(6), expected(6) = (/2,0,5,0,3,0/)
LOGICAL LDA(5)
UDA1L(1:6) = 0
uda1r = (/1,2,3,4,5,6/)
lda = (/ (i/2*2 .ne. I, i=1,5) /)
WHERE (LDA)
UDA1L(1:5) = UDA1R(2:6)
ELSEWHERE
UDA1L(2:6) = UDA1R(6:2:-1)
ENDWHERE
if (any (expected /= uda1l)) call abort
END subroutine
SUBROUTINE PR35756
INTEGER ILA(10), CLA(10)
LOGICAL LDA(10)
ILA = (/ (I, i=1,10) /)
LDA = (/ (i/2*2 .ne. I, i=1,10) /)
WHERE(LDA)
CLA = 10
ELSEWHERE
CLA = 2
ENDWHERE
WHERE(LDA)
ILA = R_MY_MAX_I(ILA)
ELSEWHERE
ILA = R_MY_MIN_I(ILA)
ENDWHERE
IF (any (CLA /= ILA)) call abort
end subroutine
INTEGER FUNCTION R_MY_MAX_I(A)
INTEGER :: A(:)
R_MY_MAX_I = MAXVAL(A)
END FUNCTION R_MY_MAX_I
INTEGER FUNCTION R_MY_MIN_I(A)
INTEGER :: A(:)
R_MY_MIN_I = MINVAL(A)
END FUNCTION R_MY_MIN_I
END
gcc/testsuite/gfortran.dg/where_2.f90 0 → 100644
! { dg-do run }
! Tests the fix for PR35743 and PR35745.
!
! Contributed by Dick Hendrickson <dick.hendrickson@gmail.com>
!
program try_rg0025
logical lda(5)
lda = (/(i/2*2 .ne. I, i=1,5)/)
call PR35743 (lda, 1, 2, 3, 5, 6, -1, -2)
CALL PR34745
end program
! Previously, the negative mask size would not be detected.
SUBROUTINE PR35743 (LDA,nf1,nf2,nf3,nf5,nf6,mf1,mf2)
type unseq
real r
end type unseq
TYPE(UNSEQ) TDA1L(6)
LOGICAL LDA(NF5)
TDA1L(1:6)%r = 1.0
WHERE (LDA(NF6:NF3))
TDA1L(MF1:NF5:MF1) = TDA1L(NF6:NF2)
ENDWHERE
END SUBROUTINE
! Previously, the expression in the WHERE block would be evaluated
! ouside the loop generated by the where.
SUBROUTINE PR34745
INTEGER IDA(10)
REAL RDA(10)
RDA = 1.0
nf0 = 0
WHERE (RDA < -15.0)
IDA = 1/NF0 + 2
ENDWHERE
END SUBROUTINE
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