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reload1.c (reload): Only spill eliminable register with multiple adjacent elimination alternatives... 

* reload1.c (reload): Only spill eliminable register with multiple
	adjacent elimination alternatives if all alternatives fail.

From-SVN: r78430
This commit is contained in:
J"orn Rennecke 2004-02-25 12:42:26 +00:00 committed by Joern Rennecke
parent e1471c91b8
commit 4ab51fb500
2 changed files with 21 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-02-25 J"orn Rennecke <joern.rennecke@superh.com>
* reload1.c (reload): Only spill eliminable register with multiple
adjacent elimination alternatives if all alternatives fail.
2004-02-25 Richard Earnshaw <rearnsha@arm.com>
* arm.c (arm_legitimate_index_p): For QImode the range of an offset

19
gcc/reload1.c
View File

@ -849,9 +849,22 @@ reload (rtx first, int global)
/* Spill any hard regs that we know we can't eliminate. */
CLEAR_HARD_REG_SET (used_spill_regs);
for (ep = reg_eliminate; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++)
if (! ep->can_eliminate)
spill_hard_reg (ep->from, 1);
/* There can be multiple ways to eliminate a register;
they should be listed adjacently.
Elimination for any register fails only if all possible ways fail. */
for (ep = reg_eliminate; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; )
{
int from = ep->from;
int can_eliminate = 0;
do
{
can_eliminate |= ep->can_eliminate;
ep++;
}
while (ep < &reg_eliminate[NUM_ELIMINABLE_REGS] && ep->from == from);
if (! can_eliminate)
spill_hard_reg (from, 1);
}
#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
if (frame_pointer_needed)