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fold-const.c (associate_trees): Only optimize NEGATE_EXPR in one of the operands into MINUS_EXPR if...

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* fold-const.c (associate_trees): Only optimize NEGATE_EXPR in one
	of the operands into MINUS_EXPR if code is PLUS_EXPR.

	* gcc.c-torture/execute/20020805-1.c: New test.

From-SVN: r56058
This commit is contained in:
Jakub Jelinek 2002-08-05 21:26:27 +02:00 committed by Jakub Jelinek
parent 5133ad466a
commit 1bed5ee327
4 changed files with 38 additions and 8 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-08-05 Jakub Jelinek <jakub@redhat.com>
* fold-const.c (associate_trees): Only optimize NEGATE_EXPR in one
of the operands into MINUS_EXPR if code is PLUS_EXPR.
2002-08-05 Douglas B Rupp <rupp@gnat.com>
* config.gcc (i[34567]86-*-interix*): Replace interix.o with winnt.o

18
gcc/fold-const.c
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@ -1001,14 +1001,16 @@ associate_trees (t1, t2, code, type)
if (TREE_CODE (t1) == code || TREE_CODE (t2) == code
|| TREE_CODE (t1) == MINUS_EXPR || TREE_CODE (t2) == MINUS_EXPR)
{
if (TREE_CODE (t1) == NEGATE_EXPR)
return build (MINUS_EXPR, type, convert (type, t2),
convert (type, TREE_OPERAND (t1, 0)));
else if (TREE_CODE (t2) == NEGATE_EXPR)
return build (MINUS_EXPR, type, convert (type, t1),
convert (type, TREE_OPERAND (t2, 0)));
else
return build (code, type, convert (type, t1), convert (type, t2));
if (code == PLUS_EXPR)
{
if (TREE_CODE (t1) == NEGATE_EXPR)
return build (MINUS_EXPR, type, convert (type, t2),
convert (type, TREE_OPERAND (t1, 0)));
else if (TREE_CODE (t2) == NEGATE_EXPR)
return build (MINUS_EXPR, type, convert (type, t1),
convert (type, TREE_OPERAND (t2, 0)));
}
return build (code, type, convert (type, t1), convert (type, t2));
}
return fold (build (code, type, convert (type, t1), convert (type, t2)));

2
gcc/testsuite/ChangeLog
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@ -2,6 +2,8 @@
* consistency.vlad/layout/endian.c: Include string.h.
* gcc.c-torture/execute/20020805-1.c: New test.
2002-08-04 Gabriel Dos Reis <gdr@nerim.net>
* g++.dg/other/conversion1.C: New test.

21
gcc/testsuite/gcc.c-torture/execute/20020805-1.c Normal file
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@ -0,0 +1,21 @@
/* This testcase was miscompiled on IA-32, because fold-const
assumed associate_trees is always done on PLUS_EXPR. */
extern void abort (void);
extern void exit (int);
void check (unsigned int m)
{
if (m != (unsigned int) -1)
abort ();
}
unsigned int n = 1;
int main (void)
{
unsigned int m;
m = (1 | (2 - n)) | (-n);
check (m);
exit (0);
}