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re PR rtl-optimization/6305 (c++ gets ICE in reload_cse_simplify_operands) 

PR optimization/6305
* config/s390/s390.c (s390_expand_plus_operand): Use find_replacement
to make sure previous reloads are taken into account.  Generate
better code if one operand is an in-range immediate constant.

From-SVN: r52416
This commit is contained in:
Ulrich Weigand 2002-04-17 12:19:40 +00:00 committed by Ulrich Weigand
parent a39107f106
commit 13d8b67ef2
2 changed files with 25 additions and 8 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2002-04-17 Ulrich Weigand <uweigand@de.ibm.com>
PR optimization/6305
* config/s390/s390.c (s390_expand_plus_operand): Use find_replacement
to make sure previous reloads are taken into account. Generate
better code if one operand is an in-range immediate constant.
2002-04-16 Andrew Haley <aph@cambridge.redhat.com>
* doc/install.texi (Building): libgcj requires GNU make.

26
gcc/config/s390/s390.c
View File

@ -37,6 +37,7 @@ Boston, MA 02111-1307, USA. */
#include "function.h"
#include "recog.h"
#include "expr.h"
#include "reload.h"
#include "toplev.h"
#include "basic-block.h"
#include "integrate.h"
@ -1189,15 +1190,21 @@ s390_expand_plus_operand (target, src, scratch_in)
if (GET_CODE (src) != PLUS || GET_MODE (src) != Pmode)
abort ();
sum1 = XEXP (src, 0);
sum2 = XEXP (src, 1);
/* Check if any of the two operands is already scheduled
for replacement by reload. This can happen e.g. when
float registers occur in an address. */
sum1 = find_replacement (&XEXP (src, 0));
sum2 = find_replacement (&XEXP (src, 1));
/* If one of the two operands is equal to the target,
make it the first one. */
if (rtx_equal_p (target, sum2))
make it the first one. If one is a constant, make
it the second one. */
if (rtx_equal_p (target, sum2)
|| GET_CODE (sum1) == CONST_INT)
{
sum2 = XEXP (src, 0);
sum1 = XEXP (src, 1);
rtx tem = sum2;
sum2 = sum1;
sum1 = tem;
}
/* If the first operand is not an address register,
@ -1210,8 +1217,11 @@ s390_expand_plus_operand (target, src, scratch_in)
/* Likewise for the second operand. However, take
care not to clobber the target if we already used
it for the first operand. Use the scratch instead. */
if (true_regnum (sum2) < 1 || true_regnum (sum2) > 15)
it for the first operand. Use the scratch instead.
Also, allow an immediate offset if it is in range. */
if ((true_regnum (sum2) < 1 || true_regnum (sum2) > 15)
&& !(GET_CODE (sum2) == CONST_INT
&& INTVAL (sum2) >= 0 && INTVAL (sum2) < 4096))
{
if (!rtx_equal_p (target, sum1))
{