--- a/src/HOL/Word/Examples/WordExamples.thy Sun Dec 03 19:00:55 2017 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,207 +0,0 @@
-(* Title: HOL/Word/Examples/WordExamples.thy
- Authors: Gerwin Klein and Thomas Sewell, NICTA
-
-Examples demonstrating and testing various word operations.
-*)
-
-section "Examples of word operations"
-
-theory WordExamples
- imports "HOL-Word.Word" "HOL-Word.WordBitwise"
-begin
-
-type_synonym word32 = "32 word"
-type_synonym word8 = "8 word"
-type_synonym byte = word8
-
-text "modulus"
-
-lemma "(27 :: 4 word) = -5" by simp
-
-lemma "(27 :: 4 word) = 11" by simp
-
-lemma "27 \<noteq> (11 :: 6 word)" by simp
-
-text "signed"
-
-lemma "(127 :: 6 word) = -1" by simp
-
-text "number ring simps"
-
-lemma
- "27 + 11 = (38::'a::len word)"
- "27 + 11 = (6::5 word)"
- "7 * 3 = (21::'a::len word)"
- "11 - 27 = (-16::'a::len word)"
- "- (- 11) = (11::'a::len word)"
- "-40 + 1 = (-39::'a::len word)"
- by simp_all
-
-lemma "word_pred 2 = 1" by simp
-
-lemma "word_succ (- 3) = -2" by simp
-
-lemma "23 < (27::8 word)" by simp
-lemma "23 \<le> (27::8 word)" by simp
-lemma "\<not> 23 < (27::2 word)" by simp
-lemma "0 < (4::3 word)" by simp
-lemma "1 < (4::3 word)" by simp
-lemma "0 < (1::3 word)" by simp
-
-text "ring operations"
-
-lemma "a + 2 * b + c - b = (b + c) + (a :: 32 word)" by simp
-
-text "casting"
-
-lemma "uint (234567 :: 10 word) = 71" by simp
-lemma "uint (-234567 :: 10 word) = 953" by simp
-lemma "sint (234567 :: 10 word) = 71" by simp
-lemma "sint (-234567 :: 10 word) = -71" by simp
-lemma "uint (1 :: 10 word) = 1" by simp
-
-lemma "unat (-234567 :: 10 word) = 953" by simp
-lemma "unat (1 :: 10 word) = 1" by simp
-
-lemma "ucast (0b1010 :: 4 word) = (0b10 :: 2 word)" by simp
-lemma "ucast (0b1010 :: 4 word) = (0b1010 :: 10 word)" by simp
-lemma "scast (0b1010 :: 4 word) = (0b111010 :: 6 word)" by simp
-lemma "ucast (1 :: 4 word) = (1 :: 2 word)" by simp
-
-text "reducing goals to nat or int and arith:"
-lemma "i < x \<Longrightarrow> i < i + 1" for i x :: "'a::len word"
- by unat_arith
-lemma "i < x \<Longrightarrow> i < i + 1" for i x :: "'a::len word"
- by unat_arith
-
-text "bool lists"
-
-lemma "of_bl [True, False, True, True] = (0b1011::'a::len word)" by simp
-
-lemma "to_bl (0b110::4 word) = [False, True, True, False]" by simp
-
-text "this is not exactly fast, but bearable"
-lemma "of_bl (replicate 32 True) = (0xFFFFFFFF::32 word)" by simp
-
-text "this works only for replicate n True"
-lemma "of_bl (replicate 32 True) = (0xFFFFFFFF::32 word)"
- by (unfold mask_bl [symmetric]) (simp add: mask_def)
-
-
-text "bit operations"
-
-lemma "0b110 AND 0b101 = (0b100 :: 32 word)" by simp
-lemma "0b110 OR 0b011 = (0b111 :: 8 word)" by simp
-lemma "0xF0 XOR 0xFF = (0x0F :: byte)" by simp
-lemma "NOT (0xF0 :: 16 word) = 0xFF0F" by simp
-lemma "0 AND 5 = (0 :: byte)" by simp
-lemma "1 AND 1 = (1 :: byte)" by simp
-lemma "1 AND 0 = (0 :: byte)" by simp
-lemma "1 AND 5 = (1 :: byte)" by simp
-lemma "1 OR 6 = (7 :: byte)" by simp
-lemma "1 OR 1 = (1 :: byte)" by simp
-lemma "1 XOR 7 = (6 :: byte)" by simp
-lemma "1 XOR 1 = (0 :: byte)" by simp
-lemma "NOT 1 = (254 :: byte)" by simp
-lemma "NOT 0 = (255 :: byte)" apply simp oops
-(* FIXME: "NOT 0" rewrites to "max_word" instead of "-1" *)
-
-lemma "(-1 :: 32 word) = 0xFFFFFFFF" by simp
-
-lemma "(0b0010 :: 4 word) !! 1" by simp
-lemma "\<not> (0b0010 :: 4 word) !! 0" by simp
-lemma "\<not> (0b1000 :: 3 word) !! 4" by simp
-lemma "\<not> (1 :: 3 word) !! 2" by simp
-
-lemma "(0b11000 :: 10 word) !! n = (n = 4 \<or> n = 3)"
- by (auto simp add: bin_nth_Bit0 bin_nth_Bit1)
-
-lemma "set_bit 55 7 True = (183::'a::len0 word)" by simp
-lemma "set_bit 0b0010 7 True = (0b10000010::'a::len0 word)" by simp
-lemma "set_bit 0b0010 1 False = (0::'a::len0 word)" by simp
-lemma "set_bit 1 3 True = (0b1001::'a::len0 word)" by simp
-lemma "set_bit 1 0 False = (0::'a::len0 word)" by simp
-lemma "set_bit 0 3 True = (0b1000::'a::len0 word)" by simp
-lemma "set_bit 0 3 False = (0::'a::len0 word)" by simp
-
-lemma "lsb (0b0101::'a::len word)" by simp
-lemma "\<not> lsb (0b1000::'a::len word)" by simp
-lemma "lsb (1::'a::len word)" by simp
-lemma "\<not> lsb (0::'a::len word)" by simp
-
-lemma "\<not> msb (0b0101::4 word)" by simp
-lemma "msb (0b1000::4 word)" by simp
-lemma "\<not> msb (1::4 word)" by simp
-lemma "\<not> msb (0::4 word)" by simp
-
-lemma "word_cat (27::4 word) (27::8 word) = (2843::'a::len word)" by simp
-lemma "word_cat (0b0011::4 word) (0b1111::6word) = (0b0011001111 :: 10 word)"
- by simp
-
-lemma "0b1011 << 2 = (0b101100::'a::len0 word)" by simp
-lemma "0b1011 >> 2 = (0b10::8 word)" by simp
-lemma "0b1011 >>> 2 = (0b10::8 word)" by simp
-lemma "1 << 2 = (0b100::'a::len0 word)" apply simp? oops
-
-lemma "slice 3 (0b101111::6 word) = (0b101::3 word)" by simp
-lemma "slice 3 (1::6 word) = (0::3 word)" apply simp? oops
-
-lemma "word_rotr 2 0b0110 = (0b1001::4 word)" by simp
-lemma "word_rotl 1 0b1110 = (0b1101::4 word)" by simp
-lemma "word_roti 2 0b1110 = (0b1011::4 word)" by simp
-lemma "word_roti (- 2) 0b0110 = (0b1001::4 word)" by simp
-lemma "word_rotr 2 0 = (0::4 word)" by simp
-lemma "word_rotr 2 1 = (0b0100::4 word)" apply simp? oops
-lemma "word_rotl 2 1 = (0b0100::4 word)" apply simp? oops
-lemma "word_roti (- 2) 1 = (0b0100::4 word)" apply simp? oops
-
-lemma "(x AND 0xff00) OR (x AND 0x00ff) = (x::16 word)"
-proof -
- have "(x AND 0xff00) OR (x AND 0x00ff) = x AND (0xff00 OR 0x00ff)"
- by (simp only: word_ao_dist2)
- also have "0xff00 OR 0x00ff = (-1::16 word)"
- by simp
- also have "x AND -1 = x"
- by simp
- finally show ?thesis .
-qed
-
-text "alternative proof using bitwise expansion"
-
-lemma "(x AND 0xff00) OR (x AND 0x00ff) = (x::16 word)"
- by word_bitwise
-
-text "more proofs using bitwise expansion"
-
-lemma "(x AND NOT 3) >> 4 << 2 = ((x >> 2) AND NOT 3)"
- for x :: "10 word"
- by word_bitwise
-
-lemma "((x AND -8) >> 3) AND 7 = (x AND 56) >> 3"
- for x :: "12 word"
- by word_bitwise
-
-text "some problems require further reasoning after bit expansion"
-
-lemma "x \<le> 42 \<Longrightarrow> x \<le> 89"
- for x :: "8 word"
- apply word_bitwise
- apply blast
- done
-
-lemma "(x AND 1023) = 0 \<Longrightarrow> x \<le> -1024"
- for x :: word32
- apply word_bitwise
- apply clarsimp
- done
-
-text "operations like shifts by non-numerals will expose some internal list
- representations but may still be easy to solve"
-
-lemma shiftr_overflow: "32 \<le> a \<Longrightarrow> b >> a = 0"
- for b :: word32
- apply word_bitwise
- apply simp
- done
-
-end