Several vector tests are sensitive to the vector size.  This patch adds
a VECTOR_BITS macro to tree-vect.h to select the expected vector size
and uses it to influence iteration counts and array sizes.  The tests
keep the original values if the vector size is small enough.

For now VECTOR_BITS is always 128, but the SVE patches add other values.

2017-11-09  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/testsuite/
	* gcc.dg/vect/tree-vect.h (VECTOR_BITS): Define.
	* gcc.dg/vect/bb-slp-pr69907.c: Include tree-vect.h.
	(N): New macro.
	(foo): Use it instead of hard-coded 320.
	* gcc.dg/vect/no-scevccp-outer-7.c (N): Redefine if the default
	value is too small for VECTOR_BITS.
	* gcc.dg/vect/no-scevccp-vect-iv-3.c (N): Likewise.
	* gcc.dg/vect/no-section-anchors-vect-31.c (N): Likewise.
	* gcc.dg/vect/no-section-anchors-vect-36.c (N): Likewise.
	* gcc.dg/vect/slp-perm-9.c (N): Likewise.
	* gcc.dg/vect/vect-32.c (N): Likewise.
	* gcc.dg/vect/vect-75.c (N, OFF): Likewise.
	* gcc.dg/vect/vect-77-alignchecks.c (N, OFF): Likewise.
	* gcc.dg/vect/vect-78-alignchecks.c (N, OFF): Likewise.
	* gcc.dg/vect/vect-89.c (N): Likewise.
	* gcc.dg/vect/vect-96.c (N): Likewise.
	* gcc.dg/vect/vect-multitypes-3.c (N): Likewise.
	* gcc.dg/vect/vect-multitypes-6.c (N): Likewise.
	* gcc.dg/vect/vect-over-widen-1.c (N): Likewise.
	* gcc.dg/vect/vect-over-widen-4.c (N): Likewise.
	* gcc.dg/vect/vect-reduc-pattern-1a.c (N): Likewise.
	* gcc.dg/vect/vect-reduc-pattern-1b.c (N): Likewise.
	* gcc.dg/vect/vect-reduc-pattern-2a.c (N): Likewise.
	* gcc.dg/vect/no-section-anchors-vect-64.c (NINTS): New macro.
	(N): Redefine in terms of NINTS.
	(ia, ib, ic): Use NINTS instead of hard-coded constants in the
	array bounds.
	* gcc.dg/vect/no-section-anchors-vect-69.c (NINTS): New macro.
	(N): Redefine in terms of NINTS.
	(test1): Replace a and b fields with NINTS - 2 ints of padding.
	(main1): Use NINTS instead of hard-coded constants.
	* gcc.dg/vect/section-anchors-vect-69.c (NINTS): New macro.
	(N): Redefine in terms of NINTS.
	(test1): Replace a and b fields with NINTS - 2 ints of padding.
	(test2): Remove incorrect comments about alignment.
	(main1): Use NINTS instead of hard-coded constants.
	* gcc.dg/vect/pr45752.c (N): Redefine if the default value is
	too small for VECTOR_BITS.
	(main): Continue to use canned results for the default value of N,
	but compute the expected results from scratch for other values.
	* gcc.dg/vect/slp-perm-1.c (N, main): As for pr45752.c.
	* gcc.dg/vect/slp-perm-4.c (N, main): Likewise.
	* gcc.dg/vect/slp-perm-5.c (N, main): Likewise.
	* gcc.dg/vect/slp-perm-6.c (N, main): Likewise.
	* gcc.dg/vect/slp-perm-7.c (N, main): Likewise.
	* gcc.dg/vect/pr65518.c (NINTS, N, RESULT): New macros.
	(giga): Use NINTS as the array bound.
	(main): Use NINTS, N and RESULT.
	* gcc.dg/vect/pr65947-5.c (N): Redefine if the default value is
	too small for VECTOR_BITS.
	(main): Fill in any remaining elements of A programmatically.
	* gcc.dg/vect/pr81136.c: Include tree-vect.h.
	(a): Use VECTOR_BITS to set the alignment of the target structure.
	* gcc.dg/vect/slp-19c.c (N): Redefine if the default value is
	too small for VECTOR_BITS.
	(main1): Continue to use the canned input for the default value of N,
	but compute the input from scratch for other values.
	* gcc.dg/vect/slp-28.c (N): Redefine if the default value is
	too small for VECTOR_BITS.
	(in1, in2, in3): Remove initialization.
	(check1, check2): Delete.
	(main1): Initialize in1, in2 and in3 here.  Check every element
	of the vectors and compute the expected values directly instead
	of using an array.
	* gcc.dg/vect/slp-perm-8.c (N): Redefine if the default value is
	too small for VECTOR_BITS.
	(foo, main): Change type of "i" to int.
	* gcc.dg/vect/vect-103.c (NINTS): New macro.
	(N): Redefine in terms of N.
	(c): Delete.
	(main1): Use NINTS.  Check the result from a and b directly.
	* gcc.dg/vect/vect-67.c (NINTS): New macro.
	(N): Redefine in terms of N.
	(main1): Use NINTS for the inner array bounds.
	* gcc.dg/vect/vect-70.c (NINTS, OUTERN): New macros.
	(N): Redefine in terms of NINTS.
	(s): Keep the outer dimensions as 4 even if N is larger than 24.
	(tmp1): New variable.
	(main1): Only define a local tmp1 if NINTS is relatively small.
	Use OUTERN for the outer loops and NINTS for the inner loops.
	* gcc.dg/vect/vect-91.c (OFF): New macro.
	(a, main3): Use it.
	* gcc.dg/vect/vect-92.c (NITER): New macro.
	(main1, main2): Use it.
	* gcc.dg/vect/vect-93.c (N): Rename to...
	(N1): ...this.
	(main): Update accordingly.
	(N2): New macro.
	(main1): Use N1 instead of 3001 and N2 insteaed of 10.
	* gcc.dg/vect/vect-multitypes-1.c (NSHORTS, NINTS): New macros.
	(N): Redefine in terms of NSHORTS.
	(main1): Use NINTS - 1 instead of 3 and NSHORTS - 1 instead of 7.
	(main): Likewise.
	* gcc.dg/vect/vect-over-widen-3-big-array.c (N): Define to VECTOR_BITS.
	(foo): Truncate the expected value to the type of *d.
	* gcc.dg/vect/vect-peel-3.c (NINTS, EXTRA): New macros.
	(ia, ib, ic, main): Use EXTRA.
	(main): Use NINTS.
	(RES_A, RES_B, REC_C): New macros.
	(RES): Redefine as their sum.
	* gcc.dg/vect/vect-reduc-or_1.c (N): New macro.
	(in): Change number of elements to N.
	(main): Update accordingly.  Calculate the expected result.
	* gcc.dg/vect/vect-reduc-or_2.c (N, in, main): As for
	vect-reduc-or-1.c.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r254589