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• Encoding

Encode-load-funct

Encode the name of an instruction with the LOAD opcode into the func3 field [ISA:2.6] [ISA:4.3] [ISA:34].

Signature

(encode-load-funct funct feat) → funct3

Arguments

funct — Guard (load-funct-p funct).

feat — Guard (featp feat).

Returns

funct3 — Type (ubyte3p funct3).

Definitions and Theorems

Function: encode-load-funct

(defun encode-load-funct (funct feat)
  (declare (xargs :guard (and (load-funct-p funct)
                              (featp feat))))
  (declare (xargs :guard (implies (or (load-funct-case funct :lwu)
                                      (load-funct-case funct :ld))
                                  (feat-64p feat))))
  (let ((__function__ 'encode-load-funct))
    (declare (ignorable __function__))
    (load-funct-case funct
                     :lb 0
                     :lbu 4
                     :lh 1
                     :lhu 5
                     :lw 2
                     :lwu (assert$ (feat-64p feat) 6)
                     :ld (assert$ (feat-64p feat) 3))))

Theorem: ubyte3p-of-encode-load-funct

(defthm ubyte3p-of-encode-load-funct
  (b* ((funct3 (encode-load-funct funct feat)))
    (ubyte3p funct3))
  :rule-classes :rewrite)

Theorem: encode-load-funct-of-load-funct-fix-funct

(defthm encode-load-funct-of-load-funct-fix-funct
  (equal (encode-load-funct (load-funct-fix funct)
                            feat)
         (encode-load-funct funct feat)))

Theorem: encode-load-funct-load-funct-equiv-congruence-on-funct

(defthm encode-load-funct-load-funct-equiv-congruence-on-funct
  (implies (load-funct-equiv funct funct-equiv)
           (equal (encode-load-funct funct feat)
                  (encode-load-funct funct-equiv feat)))
  :rule-classes :congruence)

Theorem: encode-load-funct-of-feat-fix-feat

(defthm encode-load-funct-of-feat-fix-feat
  (equal (encode-load-funct funct (feat-fix feat))
         (encode-load-funct funct feat)))

Theorem: encode-load-funct-feat-equiv-congruence-on-feat

(defthm encode-load-funct-feat-equiv-congruence-on-feat
  (implies (feat-equiv feat feat-equiv)
           (equal (encode-load-funct funct feat)
                  (encode-load-funct funct feat-equiv)))
  :rule-classes :congruence)