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frontend-passes.c (optimize_assignment): Follow chains of concatenation operators to the end for removing trailing TRIMS... 

2011-05-11  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* frontend-passes.c (optimize_assignment): Follow chains
	of concatenation operators to the end for removing trailing
	TRIMS for assignments.

2011-05-11  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* gfortran.dg/trim_optimize_7.f90:  New test.

From-SVN: r174944
This commit is contained in:
Thomas Koenig 2011-06-11 08:22:35 +00:00
parent 891daafaf8
commit b5ee9d1c0d
4 changed files with 37 additions and 0 deletions
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6
gcc/fortran/ChangeLog
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@ -1,3 +1,9 @@
2011-05-11 Thomas Koenig <tkoenig@gcc.gnu.org>
* frontend-passes.c (optimize_assignment): Follow chains
of concatenation operators to the end for removing trailing
TRIMS for assignments.
2011-06-10 Daniel Carrera <dcarrera@gmail.com>
* trans-decl.c (gfc_build_builtin_function_decls):

8
gcc/fortran/frontend-passes.c
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@ -500,6 +500,14 @@ optimize_assignment (gfc_code * c)
if (lhs->ts.type == BT_CHARACTER)
{
/* Check for a // b // trim(c). Looping is probably not
necessary because the parser usually generates
(// (// a b ) trim(c) ) , but better safe than sorry. */
while (rhs->expr_type == EXPR_OP
&& rhs->value.op.op == INTRINSIC_CONCAT)
rhs = rhs->value.op.op2;
if (rhs->expr_type == EXPR_FUNCTION &&
rhs->value.function.isym &&
rhs->value.function.isym->id == GFC_ISYM_TRIM)

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2011-05-11 Thomas Koenig <tkoenig@gcc.gnu.org>
* gfortran.dg/trim_optimize_7.f90: New test.
2011-06-10 Wei Guozhi <carrot@google.com>
PR target/45335

19
gcc/testsuite/gfortran.dg/trim_optimize_7.f90 Normal file
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@ -0,0 +1,19 @@
! { dg-do run }
! { dg-options "-O -fdump-tree-original" }
! Check that trailing trims are also removed from assignment of
! expressions involving concatenations of strings .
program main
character(2) :: a,b,c
character(8) :: d
a = 'a '
b = 'b '
c = 'c '
d = a // b // a // trim(c) ! This should be optimized away.
if (d /= 'a b a c ') call abort
d = a // trim(b) // c // a ! This shouldn't.
if (d /= 'a bc a ') call abort
d = a // b // a // trim(trim(c)) ! This should also be optimized away.
if (d /= 'a b a c ') call abort
end
! { dg-final { scan-tree-dump-times "string_len_trim" 1 "original" } }
! { dg-final { cleanup-tree-dump "original" } }