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re PR tree-optimization/77824 (unreachable code in SLSR GIMPLE pass) 

2016-10-10  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/77824
	* gimple-ssa-strength-reduction.c (stmt_cost): Explicitly return
	zero cost for copies.
	(find_candidates_dom_walker::before_dom_children): Replace
	MODIFY_EXPR with SSA_NAME.
	(replace_mult_candidate): Likewise.
	(replace_profitable_candidates): Likewise.

From-SVN: r240945
This commit is contained in:
Bill Schmidt 2016-10-10 18:39:41 +00:00 committed by William Schmidt
parent e2be44770c
commit fbcdc43e3c
2 changed files with 17 additions and 4 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2016-10-10 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/77824
* gimple-ssa-strength-reduction.c (stmt_cost): Explicitly return
zero cost for copies.
(find_candidates_dom_walker::before_dom_children): Replace
MODIFY_EXPR with SSA_NAME.
(replace_mult_candidate): Likewise.
(replace_profitable_candidates): Likewise.
2016-10-10 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* config/s390/s390.h: Wrap more macros args in brackets and fix

11
gcc/gimple-ssa-strength-reduction.c
View File

@ -688,6 +688,9 @@ stmt_cost (gimple *gs, bool speed)
/* Note that we don't assign costs to copies that in most cases
will go away. */
case SSA_NAME:
return 0;
default:
;
}
@ -1693,7 +1696,7 @@ find_candidates_dom_walker::before_dom_children (basic_block bb)
gcc_fallthrough ();
CASE_CONVERT:
case MODIFY_EXPR:
case SSA_NAME:
case NEGATE_EXPR:
rhs1 = gimple_assign_rhs1 (gs);
if (TREE_CODE (rhs1) != SSA_NAME)
@ -1724,7 +1727,7 @@ find_candidates_dom_walker::before_dom_children (basic_block bb)
slsr_process_cast (gs, rhs1, speed);
break;
case MODIFY_EXPR:
case SSA_NAME:
slsr_process_copy (gs, rhs1, speed);
break;
@ -2010,7 +2013,7 @@ replace_mult_candidate (slsr_cand_t c, tree basis_name, widest_int bump)
&& bump.to_shwi () != HOST_WIDE_INT_MIN
/* It is not useful to replace casts, copies, or adds of
an SSA name and a constant. */
&& cand_code != MODIFY_EXPR
&& cand_code != SSA_NAME
&& !CONVERT_EXPR_CODE_P (cand_code)
&& cand_code != PLUS_EXPR
&& cand_code != POINTER_PLUS_EXPR
@ -3445,7 +3448,7 @@ replace_profitable_candidates (slsr_cand_t c)
to a cast or copy. */
if (i >= 0
&& profitable_increment_p (i)
&& orig_code != MODIFY_EXPR
&& orig_code != SSA_NAME
&& !CONVERT_EXPR_CODE_P (orig_code))
{
if (phi_dependent_cand_p (c))