[PATCH v2 14/16]Arm: Add NEON RTL patterns for Complex Addition, Multiply and FMA.

[Tamar Christina]

Hi All,

This adds implementation for the optabs for complex additions.  With this the
following C code:

  void f90 (float complex a[restrict N], float complex b[restrict N],
	    float complex c[restrict N])
  {
    for (int i=0; i < N; i++)
      c[i] = a[i] + (b[i] * I);
  }

generates

  f90:
	  add     r3, r2, #1600
  .L2:
	  vld1.32 {q8}, [r0]!
	  vld1.32 {q9}, [r1]!
	  vcadd.f32       q8, q8, q9, #90
	  vst1.32 {q8}, [r2]!
	  cmp     r3, r2
	  bne     .L2
	  bx      lr


instead of

  f90:
	  add     r3, r2, #1600
  .L2:
	  vld2.32 {d24-d27}, [r0]!
	  vld2.32 {d20-d23}, [r1]!
	  vsub.f32	q8, q12, q11
	  vadd.f32	q9, q13, q10
	  vst2.32 {d16-d19}, [r2]!
	  cmp     r3, r2
	  bne     .L2
	  bx      lr


Bootstrapped Regtested on arm-none-linux-gnueabihf and no issues.

Ok for master?

Thanks,
Tamar

gcc/ChangeLog:

	* config/arm/iterators.md (rot): Add UNSPEC_VCMLS, UNSPEC_VCMUL and
	UNSPEC_VCMUL180.
	(rot_op, rotsplit1, rotsplit2, fcmac1, VCMLA_OP, VCMUL_OP): New.
	* config/arm/neon.md (cadd<rot><mode>3, cml<fcmac1><rot_op><mode>4,
	cmul<rot_op><mode>3): New.
	* config/arm/unspecs.md (UNSPEC_VCMUL, UNSPEC_VCMUL180, UNSPEC_VCMLS,
	UNSPEC_VCMLS180): New.

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