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common.opt (ftree-loop-ivcanon): Enable by default. 

* common.opt (ftree-loop-ivcanon): Enable by default.
	* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely):
	Enable complete loop unrolling.
	(canonicalize_induction_variables, tree_unroll_loops_completely):
	Reset scev info.

	* gcc.dg/tree-ssa/loop-1.c: Check that unrolling occurs already on
	tree level.

From-SVN: r88404
This commit is contained in:
Zdenek Dvorak 2004-10-01 20:26:37 +02:00 committed by Zdenek Dvorak
parent 734268f590
commit 47bcd07d56
5 changed files with 25 additions and 5 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2004-10-01 Zdenek Dvorak <dvorakz@suse.cz>
* common.opt (ftree-loop-ivcanon): Enable by default.
* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely):
Enable complete loop unrolling.
(canonicalize_induction_variables, tree_unroll_loops_completely):
Reset scev info.
2004-01-01 Paul Brook <paul@codesourcery.com>
* config/arm/arm.c (thumb_compute_saved_rag_mask): Or with bitmask,

2
gcc/common.opt
View File

@ -857,7 +857,7 @@ Common Report Var(flag_tree_loop_linear)
Enable linear loop transforms on trees
ftree-loop-ivcanon
Common Report Var(flag_tree_loop_ivcanon)
Common Report Var(flag_tree_loop_ivcanon) Init(1)
Create canonical induction variables in loops
ftree-loop-optimize

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2004-10-01 Zdenek Dvorak <dvorakz@suse.cz>
* gcc.dg/tree-ssa/loop-1.c: Check that unrolling occurs already on
tree level.
2004-10-01 Andrew Pinski <pinskia@physics.uc.edu>
* gcc.dg/tree-ssa/pr17343.c: Remove.

4
gcc/testsuite/gcc.dg/tree-ssa/loop-1.c
View File

@ -1,5 +1,5 @@
/* { dg-do compile } */
/* { dg-options "-O1 -ftree-loop-ivcanon -funroll-loops -fdump-tree-ivcanon-details" } */
/* { dg-options "-O1 -ftree-loop-ivcanon -funroll-loops -fdump-tree-ivcanon-details -fdump-tree-cunroll-details -fdump-tree-vars" } */
/* On 31-bit S/390 the function address will be stored (once) in the literal pool,
so scan-assembler-times "foo" will return 1 even if the loop is fully unrolled.
@ -17,6 +17,8 @@ void xxx(void)
/* We should be able to find out that the loop iterates four times and unroll it completely. */
/* { dg-final { scan-tree-dump-times "Added canonical iv to loop 1, 4 iterations" 1 "ivcanon"} } */
/* { dg-final { scan-tree-dump-times "Unrolled loop 1 completely" 1 "cunroll"} } */
/* { dg-final { scan-tree-dump-times "foo" 5 "vars"} } */
/* { dg-final { scan-assembler-times "foo" 5} } */

11
gcc/tree-ssa-loop-ivcanon.c
View File

@ -175,12 +175,9 @@ try_unroll_loop_completely (struct loops *loops ATTRIBUTE_UNUSED,
COND_EXPR_COND (cond) = dont_exit;
modify_stmt (cond);
#if 0
/* The necessary infrastructure is not in yet. */
if (!tree_duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop),
loops, n_unroll, NULL,
NULL, NULL, NULL, 0))
#endif
{
COND_EXPR_COND (cond) = old_cond;
return false;
@ -263,6 +260,10 @@ canonicalize_induction_variables (struct loops *loops)
canonicalize_loop_induction_variables (loops, loop, true, false, true);
}
/* Clean up the information about numbers of iterations, since brute force
evaluation could reveal new information. */
scev_reset ();
#if 0
/* The necessary infrastructure is not in yet. */
if (changed)
@ -291,6 +292,10 @@ tree_unroll_loops_completely (struct loops *loops)
!flag_tree_loop_ivcanon);
}
/* Clean up the information about numbers of iterations, since complete
unrolling might have invalidated it. */
scev_reset ();
#if 0
/* The necessary infrastructure is not in yet. */
if (changed)