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simplify-rtx.c (simplify_plus_minus): Negate constant iff its neg field is different to previous argument's neg field.

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* simplify-rtx.c (simplify_plus_minus): Negate constant iff its neg
	field is different to previous argument's neg field.

	* gcc.c-torture/execute/20011019-1.c: New test.

From-SVN: r46356
This commit is contained in:
Jakub Jelinek 2001-10-19 21:28:03 +02:00 committed by Jakub Jelinek
parent c5adc06afa
commit 4768dbddcd
4 changed files with 28 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-10-19 Jakub Jelinek <jakub@redhat.com>
* simplify-rtx.c (simplify_plus_minus): Negate constant iff its neg
field is different to previous argument's neg field.
Fri Oct 19 15:24:39 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* final.c (get_decl_from_op): New function.

2
gcc/simplify-rtx.c
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@ -1882,7 +1882,7 @@ simplify_plus_minus (code, mode, op0, op1)
&& CONSTANT_P (ops[n_ops - 2].op))
{
HOST_WIDE_INT value = INTVAL (ops[n_ops - 1].op);
if (ops[n_ops - 1].neg)
if (ops[n_ops - 1].neg ^ ops[n_ops - 2].neg)
value = -value;
ops[n_ops - 2].op = plus_constant (ops[n_ops - 2].op, value);
n_ops--;

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2001-10-19 Jakub Jelinek <jakub@redhat.com>
* gcc.c-torture/execute/20011019-1.c: New test.
2001-10-19 NIIBE Yutaka <gniibe@m17n.org>
* gcc.c-torture/execute/ieee/ieee.exp: Change sh-*-* to sh*-*-*.

18
gcc/testsuite/gcc.c-torture/execute/20011019-1.c Normal file
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@ -0,0 +1,18 @@
extern void exit (int);
extern void abort (void);
struct { int a; int b[5]; } x;
int *y;
int foo (void)
{
return y - x.b;
}
int main (void)
{
y = x.b;
if (foo ())
abort ();
exit (0);
}