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re PR tree-optimization/21658 (CCP does not propagate ADDR_EXPR far enough.) 

gcc/
	PR tree-optimization/21658
	* tree-ssa-ccp.c (ccp_fold): Call fold_binary instead of
	fold_binary_to_constant.  Likewise, call fold_unary instead of
	fold_unary_to_constant.

testsuite/
	PR tree-optimization/21658
	* gcc.dg/tree-ssa/pr21658.c: New.

From-SVN: r100266
This commit is contained in:
Kazu Hirata 2005-05-27 16:31:29 +00:00 committed by Kazu Hirata
parent 8b60fb432a
commit 46aad78f22
4 changed files with 35 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2005-05-27 Kazu Hirata <kazu@cs.umass.edu>
PR tree-optimization/21658
* tree-ssa-ccp.c (ccp_fold): Call fold_binary instead of
fold_binary_to_constant. Likewise, call fold_unary instead of
fold_unary_to_constant.
2005-05-27 Nathan Sidwell <nathan@codesourcery.com>
* vec.h: Implement integral type vector specialization.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2005-05-27 Kazu Hirata <kazu@cs.umass.edu>
PR tree-optimization/21658
* gcc.dg/tree-ssa/pr21658.c: New.
2005-05-27 Nathan Sidwell <nathan@codesourcery.com>
PR c++/21455

21
gcc/testsuite/gcc.dg/tree-ssa/pr21658.c Normal file
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@ -0,0 +1,21 @@
/* PR tree-optimization/21658
CCP did not propagate an ADDR_EXPR far enough, preventing the "if"
statement below from being folded. */
/* { dg-do compile } */
/* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-ccp-details" } */
void link_error (void);
void
f (void)
{
int a[10];
int *p = &a[5];
int *q = p - 1;
if (q != &a[4])
link_error ();
}
/* { dg-final { scan-tree-dump-times "with if \\(0\\)" 1 "ccp"} } */
/* { dg-final { cleanup-tree-dump "ccp" } } */

4
gcc/tree-ssa-ccp.c
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@ -849,7 +849,7 @@ ccp_fold (tree stmt)
op0 = get_value (op0, true)->value;
}
retval = fold_unary_to_constant (code, TREE_TYPE (rhs), op0);
retval = fold_unary (code, TREE_TYPE (rhs), op0);
/* If we folded, but did not create an invariant, then we can not
use this expression. */
@ -900,7 +900,7 @@ ccp_fold (tree stmt)
op1 = val->value;
}
retval = fold_binary_to_constant (code, TREE_TYPE (rhs), op0, op1);
retval = fold_binary (code, TREE_TYPE (rhs), op0, op1);
/* If we folded, but did not create an invariant, then we can not
use this expression. */