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I think that does it for cons. 

Offsets in pair records can be negative.
This commit is contained in:
Simon Forman 2019-11-09 12:14:51 -08:00
parent ab0ff48c54
commit 632161b6d1
1 changed files with 12 additions and 5 deletions
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17
thun/compiler.markII.pl
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@ -65,7 +65,7 @@ program([ % Mainloop.
% 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 preserveing the sign.
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),
@ -113,13 +113,15 @@ program([ % Mainloop.
label(Cons), % Let's cons.
asr_imm(TEMP0, TOS, 15), % TEMP0 := TOS >> 15
lsl_imm(TEMP0, TOS, 2), % Trim off the type tag 00 bits.
asr_imm(TEMP0, TEMP0, 17), % TEMP0 := TOS >> 15
eq_offset(Foo1), % if the offset is zero don't add the address. it's empty list.
add(TEMP0, TEMP0, SP), % TEMP0 = SP + TOS[30:15]
label(Foo1),
% TEMP0 = Address of the list to which to append.
and_imm(TOS, TOS, 0x7fff), % get the offset of the tail of the stack
lsl_imm(TOS, TOS, 17), % Get the offset of the tail of the stack
asr_imm(TOS, TOS, 17), % while preserving the sign.
eq_offset(Foo2), % if the offset is zero don't add the address. it's empty list.
add(TOS, TOS, SP), % TOS = SP + TOS[15:0]
label(Foo2),
@ -134,13 +136,15 @@ program([ % Mainloop.
% the address of the second item on the stack is (TOS) + TEMP1[30:15]
% the address of the third stack cell is (TOS) + TEMP1[15: 0]
asr_imm(TEMP2, TEMP1, 15), % TEMP2 := TEMP1 >> 15
lsl_imm(TEMP2, TEMP1, 2), % Trim off the type tag 00 bits.
asr_imm(TEMP2, TEMP2, 17), % TEMP2 := TEMP1 >> 15
eq_offset(Foo3), % if the offset is zero don't add the address. it's empty list.
add(TEMP2, TEMP2, TOS),
label(Foo3),
% TEMP2 contains the address of the second item on the stack
and_imm(TEMP3, TEMP1, 0x7fff), % get the offset of the third stack cell
lsl_imm(TEMP3, TEMP1, 17), % Get the offset of the third stack cell
asr_imm(TEMP3, TEMP3, 17), % while preserving the sign.
eq_offset(Foo4), % if the offset is zero don't add the address. it's empty list.
add(TEMP3, TEMP1, TOS),
label(Foo4),
@ -151,10 +155,12 @@ program([ % Mainloop.
sub_imm(TEMP2, TEMP2, 0),
eq_offset(Foo5), % if the offset is zero don't subtract the address. it's empty list.
sub(TEMP2, TEMP2, SP),
and_imm(TEMP2, TEMP2, 0x7fff), % Mask off high bits.
label(Foo5),
sub_imm(TEMP0, TEMP0, 0),
eq_offset(Foo6), % if the offset is zero don't subtract the address. it's empty list.
sub(TEMP0, TEMP0, SP),
and_imm(TEMP0, TEMP0, 0x7fff), % Mask off high bits.
label(Foo6),
lsl_imm(TEMP2, TEMP2, 15), % TEMP2 := TEMP2 << 15
ior(TEMP2, TEMP2, TEMP0),
@ -164,6 +170,7 @@ program([ % Mainloop.
sub_imm(TEMP3, TEMP3, 0),
eq_offset(Foo7), % if the offset is zero don't subtract the address. it's empty list.
sub(TEMP3, TEMP3, SP),
and_imm(TEMP3, TEMP3, 0x7fff), % Mask off high bits.
label(Foo7),
mov_imm_with_shift(TOS, 2), % TOS := 4 << 15
ior(TOS, TOS, TEMP3),