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Add support for reloading a frame address with an invalid base 

gcc/

	* lra-constraints.c (base_to_reg): New function.
	(process_address): Use new function.

From-SVN: r211802
This commit is contained in:
Robert Suchanek 2014-06-18 19:50:00 +00:00 committed by Matthew Fortune
parent 786077082e
commit c31d2d11a9
2 changed files with 47 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-06-18 Robert Suchanek <robert.suchanek@imgtec.com>
* lra-constraints.c (base_to_reg): New function.
(process_address): Use new function.
2014-06-18 Tom de Vries <tom@codesourcery.com>
* config/aarch64/aarch64-protos.h (aarch64_emit_call_insn): Declare.

44
gcc/lra-constraints.c
View File

@ -2556,6 +2556,39 @@ process_alt_operands (int only_alternative)
return ok_p;
}
/* Make reload base reg from address AD. */
static rtx
base_to_reg (struct address_info *ad)
{
enum reg_class cl;
int code = -1;
rtx new_inner = NULL_RTX;
rtx new_reg = NULL_RTX;
rtx insn;
rtx last_insn = get_last_insn();
lra_assert (ad->base == ad->base_term && ad->disp == ad->disp_term);
cl = base_reg_class (ad->mode, ad->as, ad->base_outer_code,
get_index_code (ad));
new_reg = lra_create_new_reg (GET_MODE (*ad->base_term), NULL_RTX,
cl, "base");
new_inner = simplify_gen_binary (PLUS, GET_MODE (new_reg), new_reg,
ad->disp_term == NULL
? gen_int_mode (0, ad->mode)
: *ad->disp_term);
if (!valid_address_p (ad->mode, new_inner, ad->as))
return NULL_RTX;
insn = emit_insn (gen_rtx_SET (ad->mode, new_reg, *ad->base_term));
code = recog_memoized (insn);
if (code < 0)
{
delete_insns_since (last_insn);
return NULL_RTX;
}
return new_inner;
}
/* Make reload base reg + disp from address AD. Return the new pseudo. */
static rtx
base_plus_disp_to_reg (struct address_info *ad)
@ -2775,6 +2808,8 @@ process_address_1 (int nop, rtx *before, rtx *after)
3) the address is a frame address with an invalid offset.
4) the address is a frame address with an invalid base.
All these cases involve a non-autoinc address, so there is no
point revalidating other types. */
if (ad.autoinc_p || valid_address_p (&ad))
@ -2856,14 +2891,19 @@ process_address_1 (int nop, rtx *before, rtx *after)
int regno;
enum reg_class cl;
rtx set, insns, last_insn;
/* Try to reload base into register only if the base is invalid
for the address but with valid offset, case (4) above. */
start_sequence ();
new_reg = base_to_reg (&ad);
/* base + disp => new base, cases (1) and (3) above. */
/* Another option would be to reload the displacement into an
index register. However, postreload has code to optimize
address reloads that have the same base and different
displacements, so reloading into an index register would
not necessarily be a win. */
start_sequence ();
new_reg = base_plus_disp_to_reg (&ad);
if (new_reg == NULL_RTX)
new_reg = base_plus_disp_to_reg (&ad);
insns = get_insns ();
last_insn = get_last_insn ();
/* If we generated at least two insns, try last insn source as