Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2018-02-16 Richard Biener <rguent...@suse.de>
PR tree-optimization/84399
* graphite-scop-detection.c (scop_detection::stmt_simple_for_scop_p):
For operands we can analyze at their definition make sure we can
analyze them at each use as well.
* gcc.dg/graphite/pr84399.c: New testcase.
Index: gcc/graphite-scop-detection.c
===================================================================
--- gcc/graphite-scop-detection.c (revision 257682)
+++ gcc/graphite-scop-detection.c (working copy)
@@ -1027,7 +1027,23 @@ scop_detection::stmt_simple_for_scop_p (
case GIMPLE_ASSIGN:
case GIMPLE_CALL:
- return true;
+ {
+ tree op;
+ ssa_op_iter i;
+ /* Verify that if we can analyze operands at their def site we
+ also can represent them when analyzed at their uses. */
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_USE)
+ if (scev_analyzable_p (op, scop)
+ && !graphite_can_represent_expr (scop, bb->loop_father, op))
+ {
+ DEBUG_PRINT (dp << "[scop-detection-fail] "
+ << "Graphite cannot represent stmt:\n";
+ print_gimple_stmt (dump_file, stmt, 0,
+ TDF_VOPS | TDF_MEMSYMS));
+ return false;
+ }
+ return true;
+ }
default:
/* These nodes cut a new scope. */
Index: gcc/testsuite/gcc.dg/graphite/pr84399.c
===================================================================
--- gcc/testsuite/gcc.dg/graphite/pr84399.c (nonexistent)
+++ gcc/testsuite/gcc.dg/graphite/pr84399.c (working copy)
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -floop-nest-optimize -fno-tree-loop-im --param
scev-max-expr-size=1" } */
+
+void
+h8 (int cv, int od)
+{
+ for (;;)
+ {
+ int ih = (__UINTPTR_TYPE__)&od;
+ if (cv == 0)
+ while (od < 1)
+ {
+ int lq;
+
+ for (lq = 0; lq < 3; ++lq)
+ for (ih = 0; ih < 4; ++ih)
+ od += lq;
+ }
+ while (ih < 1)
+ {
+ }
+ }
+}
