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2011-05-26  Paul Thomas  <pault@gcc.gnu.org>
	    Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/48955
	* trans-expr.c (gfc_trans_assignment_1): GFC_REVERSE_NOT_SET
	changed to GFC_ENABLE_REVERSE.
	* trans-array.c (gfc_init_loopinfo): GFC_CANNOT_REVERSE changed
	to GFC_INHIBIT_REVERSE.
	* gfortran.h : Enum gfc_reverse is now GFC_ENABLE_REVERSE,
	GFC_FORWARD_SET, GFC_REVERSE_SET and GFC_INHIBIT_REVERSE.
	* dependency.c (gfc_dep_resolver): Change names for elements of
	gfc_reverse as necessary. Change the logic so that forward
	dependences are remembered as well as backward ones. When both
	have appeared, force a temporary.

2011-05-26  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/48955
	* gfortran.dg/dependency_40.f90 : New test.

From-SVN: r174302
This commit is contained in:
Paul Thomas 2011-05-26 18:19:36 +00:00
parent b8ff4e88e7
commit aed5574e7b
7 changed files with 76 additions and 18 deletions
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15
gcc/fortran/ChangeLog
View File

@ -1,3 +1,18 @@
2011-05-26 Paul Thomas <pault@gcc.gnu.org>
Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/48955
* trans-expr.c (gfc_trans_assignment_1): GFC_REVERSE_NOT_SET
changed to GFC_ENABLE_REVERSE.
* trans-array.c (gfc_init_loopinfo): GFC_CANNOT_REVERSE changed
to GFC_INHIBIT_REVERSE.
* gfortran.h : Enum gfc_reverse is now GFC_ENABLE_REVERSE,
GFC_FORWARD_SET, GFC_REVERSE_SET and GFC_INHIBIT_REVERSE.
* dependency.c (gfc_dep_resolver): Change names for elements of
gfc_reverse as necessary. Change the logic so that forward
dependences are remembered as well as backward ones. When both
have appeared, force a temporary.
2011-05-26 Tobias Burnus <burnus@net-b.de>
PR fortran/18918

33
gcc/fortran/dependency.c
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@ -1807,7 +1807,7 @@ gfc_dep_resolver (gfc_ref *lref, gfc_ref *rref, gfc_reverse *reverse)
/* Now deal with the loop reversal logic: This only works on
ranges and is activated by setting
reverse[n] == GFC_CAN_REVERSE
reverse[n] == GFC_ENABLE_REVERSE
The ability to reverse or not is set by previous conditions
in this dimension. If reversal is not activated, the
value GFC_DEP_BACKWARD is reset to GFC_DEP_OVERLAP. */
@ -1815,25 +1815,34 @@ gfc_dep_resolver (gfc_ref *lref, gfc_ref *rref, gfc_reverse *reverse)
&& lref->u.ar.dimen_type[n] == DIMEN_RANGE)
{
/* Set reverse if backward dependence and not inhibited. */
if (reverse && reverse[n] != GFC_CANNOT_REVERSE)
if (reverse && reverse[n] == GFC_ENABLE_REVERSE)
reverse[n] = (this_dep == GFC_DEP_BACKWARD) ?
GFC_REVERSE_SET : reverse[n];
/* Inhibit loop reversal if dependence not compatible. */
if (reverse && reverse[n] != GFC_REVERSE_NOT_SET
&& this_dep != GFC_DEP_EQUAL
&& this_dep != GFC_DEP_BACKWARD
&& this_dep != GFC_DEP_NODEP)
/* Set forward if forward dependence and not inhibited. */
if (reverse && reverse[n] == GFC_ENABLE_REVERSE)
reverse[n] = (this_dep == GFC_DEP_FORWARD) ?
GFC_FORWARD_SET : reverse[n];
/* Flag up overlap if dependence not compatible with
the overall state of the expression. */
if (reverse && reverse[n] == GFC_REVERSE_SET
&& this_dep == GFC_DEP_FORWARD)
{
reverse[n] = GFC_CANNOT_REVERSE;
if (this_dep != GFC_DEP_FORWARD)
this_dep = GFC_DEP_OVERLAP;
reverse[n] = GFC_INHIBIT_REVERSE;
this_dep = GFC_DEP_OVERLAP;
}
else if (reverse && reverse[n] == GFC_FORWARD_SET
&& this_dep == GFC_DEP_BACKWARD)
{
reverse[n] = GFC_INHIBIT_REVERSE;
this_dep = GFC_DEP_OVERLAP;
}
/* If no intention of reversing or reversing is explicitly
inhibited, convert backward dependence to overlap. */
if (this_dep == GFC_DEP_BACKWARD
&& (reverse == NULL || reverse[n] == GFC_CANNOT_REVERSE))
if ((reverse == NULL && this_dep == GFC_DEP_BACKWARD)
|| (reverse != NULL && reverse[n] == GFC_INHIBIT_REVERSE))
this_dep = GFC_DEP_OVERLAP;
}

6
gcc/fortran/gfortran.h
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@ -578,10 +578,10 @@ gfc_fcoarray;
typedef enum
{
GFC_REVERSE_NOT_SET,
GFC_ENABLE_REVERSE,
GFC_FORWARD_SET,
GFC_REVERSE_SET,
GFC_CAN_REVERSE,
GFC_CANNOT_REVERSE
GFC_INHIBIT_REVERSE
}
gfc_reverse;

2
gcc/fortran/trans-array.c
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@ -2244,7 +2244,7 @@ gfc_init_loopinfo (gfc_loopinfo * loop)
for (n = 0; n < GFC_MAX_DIMENSIONS; n++)
{
loop->order[n] = n;
loop->reverse[n] = GFC_CANNOT_REVERSE;
loop->reverse[n] = GFC_INHIBIT_REVERSE;
}
loop->ss = gfc_ss_terminator;

4
gcc/fortran/trans-expr.c
View File

@ -6069,8 +6069,8 @@ gfc_trans_assignment_1 (gfc_expr * expr1, gfc_expr * expr2, bool init_flag,
/* Calculate the bounds of the scalarization. */
gfc_conv_ss_startstride (&loop);
/* Enable loop reversal. */
for (n = 0; n < loop.dimen; n++)
loop.reverse[n] = GFC_REVERSE_NOT_SET;
for (n = 0; n < GFC_MAX_DIMENSIONS; n++)
loop.reverse[n] = GFC_ENABLE_REVERSE;
/* Resolve any data dependencies in the statement. */
gfc_conv_resolve_dependencies (&loop, lss, rss);
/* Setup the scalarizing loops. */

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2011-05-26 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/48955
* gfortran.dg/dependency_40.f90 : New test.
2011-05-26 Tobias Burnus <burnus@net-b.de>
PR fortran/18918

29
gcc/testsuite/gfortran.dg/dependency_40.f90 Normal file
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@ -0,0 +1,29 @@
! { dg-do run }
! PR 48955 - missing array temporary when there was both a forward
! and a backward dependency.
! Test case slightly modified from the original one by Kacper Kowalik.
program ala
implicit none
integer, parameter :: n = 6
real, dimension(n), parameter :: result = [1.,10.,30.,90.,270., 243.];
real, dimension(n) :: v0, v1
character(len=80) :: line1, line2
v0 = [1.0, 3.0, 9.0, 27.0, 81.0, 243.0]
v1 = v0
v1(2:n-1) = v1(1:n-2) + v1(3:n)
if (any(v1 /= result)) call abort
v1 = v0
v1(2:n-1) = v0(1:n-2) + v0(3:n)
if (any(v1 /= result)) call abort
v1 = v0
v1(2:n-1) = v1(3:n) + v1(1:n-2)
if (any(v1 /= result)) call abort
v1 = v0
v1(2:n-1) = v0(3:n) + v0(1:n-2)
if (any(v1 /= result)) call abort
end program ala