--- gforth/arch/alpha/asm.fs 1999/09/30 14:01:09 1.2 +++ gforth/arch/alpha/asm.fs 1999/10/13 13:00:07 1.3 @@ -43,27 +43,13 @@ $1f constant zero \ util -: right_shift ( a n -- a>>=n ) -0 -?do - 2/ -loop -; - -: left_shift ( a n -- a<<=n ) -0 -?do - 2* -loop -; - : h@ ( addr -- n ) \ 32 bit fetch dup dup aligned = if @ $00000000ffffffff and else 4 - @ - $20 right_shift + $20 rshift endif ; @@ -76,7 +62,7 @@ dup dup aligned = if else 4 - dup @ $00000000ffffffff and - rot $20 left_shift or + rot $20 lshift or swap ! endif ; @@ -85,7 +71,7 @@ endif here here aligned = if here ! else - 32 left_shift + 32 lshift here 4 - dup @ rot or swap ! @@ -98,40 +84,40 @@ endif : Bra ( oo ) \ branch instruction format create , does> ( ra, branch_disp, addr ) - @ 26 left_shift + @ 26 lshift swap $1fffff and or - swap $1f and 21 left_shift or h, + swap $1f and 21 lshift or h, ; : Mbr ( oo.h ) \ memory branch instruction format create 2, does> ( ra, rb, hint, addr ) - 2@ 14 left_shift - swap 26 left_shift or + 2@ 14 lshift + swap 26 lshift or swap $3fff and or - swap $1f and 16 left_shift or - swap $1f and 21 left_shift or + swap $1f and 16 lshift or + swap $1f and 21 lshift or h, ; : F-P ( oo.fff ) \ floating-point operate instruction format create 2, does> ( fa, fb, fc, addr ) - 2@ 5 left_shift - swap 26 left_shift or + 2@ 5 lshift + swap 26 lshift or swap $1f and or - swap $1f and 16 left_shift or - swap $1f and 21 left_shift or + swap $1f and 16 lshift or + swap $1f and 21 lshift or h, ; : Mem ( oo ) \ memory instruction format create , does> ( ra, memory_disp, rb, addr ) - @ 26 left_shift - swap $1f and 16 left_shift or + @ 26 lshift + swap $1f and 16 lshift or swap $ffff and or - swap $1f and 21 left_shift or + swap $1f and 21 lshift or h, ; @@ -139,9 +125,9 @@ does> ( ra, memory_disp, rb, addr ) create 2, does> ( ra, rb, addr ) 2@ - swap 26 left_shift or - swap $1f and 16 left_shift or - swap $1f and 21 left_shift or + swap 26 lshift or + swap $1f and 16 lshift or + swap $1f and 21 lshift or h, ; @@ -149,11 +135,11 @@ does> ( ra, rb, addr ) create 2, does> ( ra, rb, rc, addr ) 2@ - 5 left_shift - swap 26 left_shift or + 5 lshift + swap 26 lshift or swap $1f and or - swap $1f and 16 left_shift or - swap $1f and 21 left_shift or + swap $1f and 16 lshift or + swap $1f and 21 lshift or h, ; @@ -161,19 +147,19 @@ does> ( ra, rb, rc, addr ) create 2, does> ( ra, lit, rc, addr ) 2@ - 5 left_shift - swap 26 left_shift or - 1 12 left_shift or + 5 lshift + swap 26 lshift or + 1 12 lshift or swap $1f and or - swap $ff and 13 left_shift or - swap $1f and 21 left_shift or + swap $ff and 13 lshift or + swap $1f and 21 lshift or h, ; : Pcd ( oo ) \ palcode instruction format create , does> ( palcode, addr ) - @ 26 left_shift + @ 26 lshift swap $3ffffff and or h, ; @@ -418,31 +404,35 @@ $12 $31 Opr# zapnot#, \ if, [ else, ] endif, -: if, - 0 beq, here 4 - +: ahead, ( -- asmorig ) + 31 0 br, + here 4 - ; -: else, - dup here swap - 4 / - $1fffff and - over h@ or swap h! - 31 0 br, +: if, ( -- asmorig ) + 0 beq, here 4 - ; -: endif, +: endif, ( asmorig -- ) dup here swap - 4 - 4 / $1fffff and over h@ or swap h! ; +: else, ( asmorig1 -- asmorig2 ) + ahead, + swap + endif, +; + \ begin, again, -: begin, +: begin, ( -- asmdest ) here ; -: again, +: again, ( asmdest -- ) here - 4 - 4 / $1fffff and 31 swap br, @@ -450,7 +440,7 @@ $12 $31 Opr# zapnot#, \ begin, until, -: until, +: until, ( asmdest -- ) here rot swap - 4 - 4 / $1fffff and bne, @@ -458,42 +448,112 @@ $12 $31 Opr# zapnot#, \ begin, while, repeat, -: while, - 0 beq, here 4 - +: while, ( asmdest -- asmorig asmdest ) + if, + swap ; -: repeat, - swap here - 4 - 4 / - $1fffff and - 31 swap br, - dup here 4 - swap - 4 / - $1fffff and - over h@ or swap h! +: repeat, ( asmorig asmdest -- ) + again, + endif, ; -\ labels - -10 constant mark_numbers -10 constant mark_uses +\ jump marks -create mark_table -mark_numbers mark_uses 1 + * cells allot +\ example: -: set_mark ( mark_number -- ) +\ init_marktbl \ initializes mark table +\ 31 0 br, +\ 0 store_branch \ store jump address for mark 0 +\ 1 2 3 addf, +\ 0 set_mark \ store mark 0 +\ 2 3 4 addf, +\ 2 0 beq, +\ 0 store_branch \ store jump address for mark 0 +\ calculate_marks \ calculate all jumps -; +\ with calculate_branch you can calculate the +\ displacement field without the mark_table for one branch -: set_branch ( mark_number -- ) +\ example: +\ here 31 0 br, +\ here 1 2 3 addf, +\ calculate_branch -; +5 constant mark_numbers +5 constant mark_uses -: calculate_marks ( -- ) +create mark_table +mark_numbers mark_uses 1+ * cells allot +: init_marktbl ( -- ) \ initializes mark table + mark_table mark_numbers mark_uses 1+ * cells + + mark_table + begin + over over > + while + dup 0 swap ! + 1 cells + + repeat + drop drop +; + +: set_mark ( mark_number -- ) \ sets mark, store address in mark table + dup mark_numbers >= abort" error, illegal mark number" + mark_uses 1+ * cells + mark_table + here 8 - swap ! +; + +: store_branch ( mark_number -- ) \ stores address of branch in mark table + dup mark_numbers >= abort" error, illegal mark number" + mark_uses 1+ * cells + mark_table + 1 cells + + dup mark_uses cells + swap + begin + over over > over @ and + while + 1 cells + + repeat + swap over = abort" error, not enough space in mark_table, increase mark_uses" + here 4 - swap ! ; +: calculate_branch ( mark_addr branch_addr -- ) \ calculate branch displacement field for one branch + swap over - 4 + 4 / + $1fffff and + over h@ or swap h! +; - - - - - +: calculate_mark ( tb mark_address -- tb ) \ calculates branch displacement field for one mark + over 1 cells + + dup mark_uses cells + swap + begin + over over > + while + 2over swap drop ( ei i markaddr ej j markaddr ) + over @ + dup if + calculate_branch + else + drop drop + endif + 1 cells + + repeat drop drop drop +; + +: calculate_marks ( -- ) \ calculates branch displacement field for all marks + mark_table mark_numbers 1- mark_uses 1+ * cells + + mark_table + begin + over over >= + while + dup @ + dup if \ used mark + calculate_mark + else + drop + endif + mark_uses 1+ cells + + repeat + drop drop +;