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re PR tree-optimization/70614 (GCC gets stuck with -O)

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2016-04-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/70614
	* tree-scalar-evolution.c (analyze_evolution_in_loop): Terminate
	loop if the evolution dropped to chrec_dont_know.
	(interpret_condition_phi): Likewise.

From-SVN: r234972
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Richard Biener 2016-04-14 13:21:40 +00:00 • committed by Richard Biener
parent 6db61d6f39
commit e21401b6b1
2 changed files with 12 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2016-04-14 Richard Biener <rguenther@suse.de>
PR tree-optimization/70614
* tree-scalar-evolution.c (analyze_evolution_in_loop): Terminate
loop if the evolution dropped to chrec_dont_know.
(interpret_condition_phi): Likewise.
2016-04-14 Richard Biener <rguenther@suse.de>
PR tree-optimization/70623

5
gcc/tree-scalar-evolution.c
View file

@ -1510,6 +1510,9 @@ analyze_evolution_in_loop (gphi *loop_phi_node,
/* When there are multiple back edges of the loop (which in fact never
happens currently, but nevertheless), merge their evolutions. */
evolution_function = chrec_merge (evolution_function, ev_fn);
if (evolution_function == chrec_dont_know)
break;
}
if (dump_file && (dump_flags & TDF_SCEV))
@ -1687,6 +1690,8 @@ interpret_condition_phi (struct loop *loop, gphi *condition_phi)
(loop, PHI_ARG_DEF (condition_phi, i));
res = chrec_merge (res, branch_chrec);
if (res == chrec_dont_know)
break;
}
return res;