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• Zmms-reads-and-writes

Wz256

Write val to low 256 bits of a ZMM register.

Signature

(wz256 reg val x86 &key (regtype '*zmm-access*)) → x86

Arguments

regtype — Guard (vector-access-type-p regtype).

Upper bits: For *ymm-access*, upper 256 bits are zeroed out. For *zmm-access*, no upper bits are zeroed out.

Definitions and Theorems

Function: wz256$inline

(defun wz256$inline (reg val x86 regtype)
  (declare (xargs :stobjs (x86)))
  (declare (type (unsigned-byte 5) reg)
           (type (unsigned-byte 256) val))
  (declare (xargs :guard (vector-access-type-p regtype)))
  (b* ((data (the (unsigned-byte 512)
                  (zmmi reg x86)))
       (regtype (the (unsigned-byte 3) regtype))
       (data (case regtype
               (3 (loghead 256 data))
               (otherwise data)))
       (val (the (unsigned-byte 256) (n256 val))))
    (!zmmi reg
           (part-install val data
                         :low 0
                         :width 256)
           x86)))

Theorem: x86p-wz256

(defthm x86p-wz256
  (implies (x86p x86)
           (x86p (wz256 reg val x86 :regtype access))))