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re PR inline-asm/35160 (local-alloc introduces sharing of the same pseudo/hard reg between different output regs in inline asm) 

PR inline-asm/35160
	* function.c (match_asm_constraints_1): Don't replace the same input
	multiple times.

	* gcc.target/i386/pr35160.c: New test.

From-SVN: r132263
This commit is contained in:
Jakub Jelinek 2008-02-12 19:31:53 +01:00 committed by Jakub Jelinek
parent 2e250fa218
commit d7b8033f3e
4 changed files with 57 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2008-02-12 Jakub Jelinek <jakub@redhat.com>
PR inline-asm/35160
* function.c (match_asm_constraints_1): Don't replace the same input
multiple times.
2008-02-12 Anatoly Sokolov <aesok@post.ru>
* config/avr/avr.h (AVR_HAVE_RAMPZ): Define.

18
gcc/function.c
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@ -1,6 +1,6 @@
/* Expands front end tree to back end RTL for GCC.
Copyright (C) 1987, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Free Software Foundation, Inc.
This file is part of GCC.
@ -5683,7 +5683,9 @@ match_asm_constraints_1 (rtx insn, rtx *p_sets, int noutputs)
rtx op = SET_SRC (p_sets[0]);
int ninputs = ASM_OPERANDS_INPUT_LENGTH (op);
rtvec inputs = ASM_OPERANDS_INPUT_VEC (op);
bool *output_matched = alloca (noutputs * sizeof (bool));
memset (output_matched, 0, noutputs * sizeof (bool));
for (i = 0; i < ninputs; i++)
{
rtx input, output, insns;
@ -5713,6 +5715,20 @@ match_asm_constraints_1 (rtx insn, rtx *p_sets, int noutputs)
if (j != ninputs)
continue;
/* Avoid changing the same input several times. For
asm ("" : "=mr" (out1), "=mr" (out2) : "0" (in), "1" (in));
only change in once (to out1), rather than changing it
first to out1 and afterwards to out2. */
if (i > 0)
{
for (j = 0; j < noutputs; j++)
if (output_matched[j] && input == SET_DEST (p_sets[j]))
break;
if (j != noutputs)
continue;
}
output_matched[match] = true;
start_sequence ();
emit_move_insn (output, input);
insns = get_insns ();

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2008-02-12 Jakub Jelinek <jakub@redhat.com>
PR inline-asm/35160
* gcc.target/i386/pr35160.c: New test.
PR c++/34862
* g++.dg/init/new27.C: New test.

31
gcc/testsuite/gcc.target/i386/pr35160.c Normal file
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@ -0,0 +1,31 @@
/* PR inline-asm/35160 */
/* { dg-do run } */
/* { dg-options "-O2" } */
extern void abort (void);
void
__attribute__((noinline))
foo (unsigned int *y)
{
unsigned int c0, c1, c2, d0, d1, d2;
d0 = 0; d1 = 0; d2 = 0; c0 = c1 = c2 = 0;
__asm__ ("movl $7, %k0; movl $8, %k1; movl $9, %k2"
: "+r" (d0), "+r" (d1), "+r" (d2));
__asm__ ("movl %3, %0; movl %4, %1; movl %5, %2"
: "+r" (c0), "+r" (c1), "+r" (c2), "+r" (d0), "+r" (d1), "+r" (d2));
y[0] = c0;
y[1] = c1;
y[2] = c2;
}
int
main (void)
{
unsigned int y[3];
foo (y);
if (y[0] != 7 || y[1] != 8 || y[2] != 9)
abort ();
return 0;
}