Hi All,

This patch adds pattern detections for the following operation:

  Addition with rotation of the second argument around the Argand plane.
    Supported rotations are 90 and 180.

    c = a + (b * I) and c = a + (b * I * I)

  where a, b and c are complex numbers.

Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.

Ok for master?

Thanks,
Tamar

gcc/ChangeLog:

	* doc/md.texi: Document optabs.
	* internal-fn.def (COMPLEX_ADD_ROT90, COMPLEX_ADD_ROT270): New.
	* optabs.def (cadd90_optab, cadd270_optab): New.
	* tree-vect-slp-patterns.c (class ComplexAddPattern): New.
	(slp_patterns): Add ComplexAddPattern.

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