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re PR tree-optimization/77937 (ICE: in replace_one_candidate, at gimple-ssa-strength-reduction.c:3370) 

2016-10-13  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/77937
	* gimple-ssa-strength-reduction.c (analyze_increments): Set cost
	to infinite when we have a pointer with an increment of -1.

From-SVN: r241125
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Bill Schmidt 2016-10-13 15:34:22 +00:00 committed by William Schmidt
parent 58f7dab40d
commit 2d4035dcd7
2 changed files with 11 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-10-13 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/77937
* gimple-ssa-strength-reduction.c (analyze_increments): Set cost
to infinite when we have a pointer with an increment of -1.
2016-10-13 Thomas Preud'homme <thomas.preudhomme@arm.com>
* coretypes.h: Move MEMMODEL_* macros and enum memmodel definition

5
gcc/gimple-ssa-strength-reduction.c
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@ -2818,6 +2818,11 @@ analyze_increments (slsr_cand_t first_dep, machine_mode mode, bool speed)
|| (incr == -1
&& !POINTER_TYPE_P (first_dep->cand_type)))
incr_vec[i].cost = COST_NEUTRAL;
/* FIXME: We don't handle pointers with a -1 increment yet.
They are usually unprofitable anyway. */
else if (incr == -1 && POINTER_TYPE_P (first_dep->cand_type))
incr_vec[i].cost = COST_INFINITE;
/* FORNOW: If we need to add an initializer, give up if a cast from
the candidate's type to its stride's type can lose precision.