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fold-const.c (tree_swap_operands_p): Treat SSA_NAMEs like DECLs but prefer SSA_NAMEs over DECLs.

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2007-02-16  Richard Guenther  <rguenther@suse.de>
	Christian Bruel  <christian.bruel@st.com>

	* fold-const.c (tree_swap_operands_p): Treat SSA_NAMEs like
	DECLs but prefer SSA_NAMEs over DECLs.

	* gcc.dg/strict-overflow-5.c: New testcase.

Co-Authored-By: Christian Bruel <christian.bruel@st.com>

From-SVN: r122040
This commit is contained in:
Richard Guenther 2007-02-16 13:41:03 +00:00 committed by Richard Biener
parent 6eedbf0dce
commit 421076b552
4 changed files with 42 additions and 5 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2007-02-16 Richard Guenther <rguenther@suse.de>
Christian Bruel <christian.bruel@st.com>
* fold-const.c (tree_swap_operands_p): Treat SSA_NAMEs like
DECLs but prefer SSA_NAMEs over DECLs.
2007-02-16 Richard Guenther <rguenther@suse.de>
* tree-flow-inline.h (single_imm_use_p): Remove.

17
gcc/fold-const.c
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@ -6673,11 +6673,6 @@ tree_swap_operands_p (tree arg0, tree arg1, bool reorder)
&& (TREE_SIDE_EFFECTS (arg0) || TREE_SIDE_EFFECTS (arg1)))
return 0;
if (DECL_P (arg1))
return 0;
if (DECL_P (arg0))
return 1;
/* It is preferable to swap two SSA_NAME to ensure a canonical form
for commutative and comparison operators. Ensuring a canonical
form allows the optimizers to find additional redundancies without
@ -6687,6 +6682,18 @@ tree_swap_operands_p (tree arg0, tree arg1, bool reorder)
&& SSA_NAME_VERSION (arg0) > SSA_NAME_VERSION (arg1))
return 1;
/* Put SSA_NAMEs last. */
if (TREE_CODE (arg1) == SSA_NAME)
return 0;
if (TREE_CODE (arg0) == SSA_NAME)
return 1;
/* Put variables last. */
if (DECL_P (arg1))
return 0;
if (DECL_P (arg0))
return 1;
return 0;
}

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2007-02-16 Richard Guenther <rguenther@suse.de>
Christian Bruel <christian.bruel@st.com>
* gcc.dg/strict-overflow-5.c: New testcase.
2007-02-16 Tobias Burnus <burnus@net-b.de>
PR fortran/30793

19
gcc/testsuite/gcc.dg/strict-overflow-5.c Normal file
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@ -0,0 +1,19 @@
/* { dg-do compile } */
/* { dg-options "-fstrict-overflow -O2 -fdump-tree-final_cleanup" } */
/* We can only unroll when using strict overflow semantics. */
int foo (int i)
{
int index;
int r=0;
for (index = i; index <= i+4; index+=2)
r++;
return r;
}
/* { dg-final { scan-tree-dump-times "r = 3" 1 "final_cleanup" } } */
/* { dg-final { cleanup-tree-dump "final_cleanup" } } */