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lra: Don't remove the scratch in (mem:BLK (scratch))

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LRA wants to replace SCRATCH registers with real registers.  It should
not do that with (mem:BLK (scratch)), which is special, not really a
scratch register.


2015-10-29  Segher Boessenkool  <segher@kernel.crashing.org>

	* lra-constraints.c (process_address_1): Handle (mem:BLK (scratch))
	by ignoring it.

From-SVN: r229551
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Segher Boessenkool 2015-10-29 20:24:48 +01:00 • committed by Segher Boessenkool
parent 0bb7645daa
commit 823bb05499
2 changed files with 10 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2015-10-29 Segher Boessenkool <segher@kernel.crashing.org>
* lra-constraints.c (process_address_1): Handle (mem:BLK (scratch))
by ignoring it.
2015-10-29 Richard Henderson <rth@redhat.com>
PR target/68124

5
gcc/lra-constraints.c
View file

@ -2874,6 +2874,11 @@ process_address_1 (int nop, bool check_only_p,
enum constraint_num cn = lookup_constraint (constraint);
bool change_p = false;
if (MEM_P (op)
&& GET_MODE (op) == BLKmode
&& GET_CODE (XEXP (op, 0)) == SCRATCH)
return false;
if (insn_extra_address_constraint (cn))
decompose_lea_address (&ad, curr_id->operand_loc[nop]);
else if (MEM_P (op))