Refactoring and cleanup.

thun/asm-dump.txt

@@ -1,97 +1,97 @@
 [word(0),
-do_offset(_6814),
+do_offset(_7362),
-allocate(_6824,20),
+allocate(_7372,20),
-label(_6814),
+label(_7362),
 mov_imm(0,0),
 store_word(0,0,0),
 mov_imm(0,4096),
-mov_imm(1,_6886),
+mov_imm(1,_7434),
 mov_imm(2,0),
 mov_imm(3,0),
 store_word(2,0,0),
-label(_6934),
+label(_7482),
 sub_imm(1,1,0),
-eq_offset(_6946),
+eq_offset(_7494),
 load_word(4,1,0),
 lsl_imm(5,4,2),
 asr_imm(5,5,17),
-eq_offset(_7034),
+eq_offset(_7610),
 add(5,5,1),
-label(_7034),
+label(_7610),
-load_word(3,5,0),
 lsl_imm(6,4,17),
 asr_imm(6,6,17),
-eq_offset(_7110),
+eq_offset(_7672),
 add(6,6,1),
-label(_7110),
+label(_7672),
+load_word(3,5,0),
 mov(1,6),
 asr_imm(6,3,30),
 and_imm(6,6,2),
 sub_imm(6,6,2),
-ne_offset(_7198),
+ne_offset(_7774),
 mov_imm_with_shift(6,16383),
 ior_imm(6,6,65535),
 and(6,6,3),
 do(6),
-label(_7198),
+label(_7774),
 sub_imm(0,0,4),
 sub(2,5,0),
-hi_offset(_7296),
+hi_offset(_7872),
 and_imm(2,2,32767),
-label(_7296),
+label(_7872),
 lsl_imm(2,2,15),
 ior_imm(2,2,4),
-label(_7358),
+label(_7934),
 store_word(2,0,0),
-do_offset(_6934),
+do_offset(_7482),
-label(_6946),
+label(_7494),
-do_offset(_6946),
+do_offset(_7494),
-label(_7412),
+label(_7988),
 lsl_imm(6,2,2),
 asr_imm(6,6,17),
-eq_offset(_7494),
+eq_offset(_8070),
 add(6,6,0),
-label(_7494),
+label(_8070),
 lsl_imm(2,2,17),
 asr_imm(2,2,17),
-eq_offset(_7556),
+eq_offset(_8132),
 add(2,2,0),
-label(_7556),
+label(_8132),
 load_word(7,2,0),
 lsl_imm(8,7,2),
 asr_imm(8,8,17),
-eq_offset(_7632),
+eq_offset(_8208),
 add(8,8,2),
-label(_7632),
+label(_8208),
 lsl_imm(9,7,17),
 asr_imm(9,9,17),
-eq_offset(_7694),
+eq_offset(_8270),
 add(9,9,2),
-label(_7694),
+label(_8270),
 sub_imm(0,0,4),
 sub_imm(8,8,0),
-eq_offset(_7762),
+eq_offset(_8338),
 sub(8,8,0),
 and_imm(8,8,32767),
-label(_7762),
+label(_8338),
 sub_imm(6,6,0),
-eq_offset(_7830),
+eq_offset(_8406),
 sub(6,6,0),
 and_imm(6,6,32767),
-label(_7830),
+label(_8406),
 lsl_imm(8,8,15),
 ior(8,8,6),
 store_word(8,0,0),
 sub_imm(0,0,4),
 sub_imm(9,9,0),
-eq_offset(_7960),
+eq_offset(_8536),
 sub(9,9,0),
 and_imm(9,9,32767),
-label(_7960),
+label(_8536),
 mov_imm_with_shift(2,2),
 ior(2,2,9),
-do_offset(_7358),
+do_offset(_7934),
-label(_6886),
+label(_7434),
-expr_cell(_8078,0),
+expr_cell(_8654,0),
-label(_8078),
+label(_8654),
-symbol(_7412)]
+symbol(_7988)]

thun/compiler.markII.pl

@@ -44,31 +44,17 @@ Mark II
     mov_imm(TERM, 0),
     store_word(TOS, SP, 0),  % RAM[SP] := 0
 
-    label(Main)],
+    label(Main)
-    ⟐([
+],⟐([
     if_zero(EXPR_addr, HALT),
-    load(EXPR, EXPR_addr)
+    load(EXPR, EXPR_addr),
-    ]),[
     % At this point EXPR holds the record word of the expression.
-    lsl_imm(TermAddr, EXPR, 2),  % Trim off the type tag 00 bits.
+    unpack_pair(EXPR, TermAddr, TEMP0, EXPR_addr),
-    asr_imm(TermAddr, TermAddr, 17),  % preserve sign of offset.
+    load(TERM, TermAddr)
-    eq_offset(Foo),  % if the offset is zero don't add the address. it's empty list.
+]),[
-    add(TermAddr, TermAddr, EXPR_addr), 
-    label(Foo),
-
     % TermAddr has the address of the term record.
-
+    % Now TERM has the term's record data and TermAddr has the address of the term.
-    load_word(TERM, TermAddr, 0),  % Bring the record in from RAM.
-
-    % Now Term has the term's record data and TermAddr has the address of the term.
-
-    lsl_imm(TEMP0, EXPR, 17),  % Get the offset of the tail of the expr
-    asr_imm(TEMP0, TEMP0, 17),  % while preserving the sign.
-    eq_offset(Foo0),  % if the offset is zero don't add the address. it's empty list.
-    add(TEMP0, TEMP0, EXPR_addr),  % Add the address to the offset.
-    label(Foo0),
     mov(EXPR_addr, TEMP0),
-
     % EXPR_addr now holds the address of the next cell of the expression list.
 
     % if_literal(TERM, PUSH),
@@ -123,20 +109,18 @@ Mark II
 
     % Build and write the new list cell.
     sub_imm(SP, SP, 4)
-
 ],⟐([
-
     sub_base_from_offset(TEMP2, SP),
     sub_base_from_offset(TEMP0, SP)
-
 ]),[
-
     lsl_imm(TEMP2, TEMP2, 15),  % TEMP2 := TEMP2 << 15
     ior(TEMP2, TEMP2, TEMP0),
     store_word(TEMP2, SP, 0),
 
-    sub_imm(SP, SP, 4)               ],⟐(
+    sub_imm(SP, SP, 4)
-    sub_base_from_offset(TEMP3, SP)  ),[
+],⟐(
+    sub_base_from_offset(TEMP3, SP)
+),[
     mov_imm_with_shift(TOS, 2),  % TOS := 4 << 15
     ior(TOS, TOS, TEMP3),
     do_offset(Done),  % Rely on mainloop::Done to write TOS to RAM.