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• Zmms-reads-and-writes

!zmmi-size

Write val to low nbytes of a ZMM register

Signature

(!zmmi-size nbytes index val x86 &key (regtype '*zmm-access*)) 
  → 
x86

Arguments

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

Returns

x86 — Type (x86p x86), given (x86p x86).

Upper bits: For XMM registers, upper 384 bits are preserved if regtype is *xmm-access*; for *vex-xmm-access*, these bits are zeroed out. For *ymm-access*, upper 256 bits are zeroed out. For *zmm-access*, no upper bits are zeroed out.

Definitions and Theorems

Function: !zmmi-size$inline

(defun !zmmi-size$inline (nbytes index val x86 regtype)
 (declare (xargs :stobjs (x86)))
 (declare (type (unsigned-byte 7) nbytes)
          (type (unsigned-byte 5) index)
          (type integer val))
 (declare (xargs :guard (vector-access-type-p regtype)))
 (declare (xargs :guard (and (member nbytes '(4 8 16 32 64))
                             (unsigned-byte-p (ash nbytes 3) val))))
 (case nbytes
   (4 (wz32 index val x86 :regtype regtype))
   (8 (wz64 index val x86 :regtype regtype))
   (16 (wz128 index val x86 :regtype regtype))
   (32 (wz256 index val x86 :regtype regtype))
   (64 (wz512 index val x86))
   (otherwise x86)))

Theorem: x86p-of-!zmmi-size

(defthm x86p-of-!zmmi-size
  (implies
       (x86p x86)
       (b* ((x86 (!zmmi-size$inline nbytes index val x86 regtype)))
         (x86p x86)))
  :rule-classes :rewrite)