tree-optimization/121768 - bogus double reduction detectedHEADtrunkmaster

The following changes how we detect double reductions, in particular
not setting vect_double_reduction_def on the outer PHIs when the inner
loop doesn't satisfy double reduction constraints.  It also simplifies
the setup a bit by not having to detect wheter we process an inner
loop of a double reduction.

	PR tree-optimization/121768
	* tree-vect-loop.cc (vect_inner_phi_in_double_reduction_p): Remove.
	(vect_analyze_scalar_cycles_1): Analyze inner loops of
	double reductions immediately and only mark fully recognized
	double reductions.  Skip already analyzed inner loops.
	(vect_is_simple_reduction): Change double_reduc from a flag
	to an output of the inner loop PHI and to whether we are
	processing an inner loop of a double reduction.

	* gcc.dg/vect/pr121768.c: New testcase.

0 files changed, 0 insertions, 0 deletions