mirror of
https://github.com/cc65/cc65.git
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Rewrite _hadd in assembler (a huge speedup!) and integrate it with free
for even faster code. The old _hadd function is now also written in assembler but does only setup variables and calls the internal function that is part of free. git-svn-id: svn://svn.cc65.org/cc65/trunk@182 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
950a88d55e
commit
8db1fa3aa0
@ -25,7 +25,6 @@ vsprintf.s
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sprintf.s
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abort.s
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errormsg.s
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_hadd.s
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cprintf.s
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vcprintf.s
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freopen.s
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@ -18,10 +18,11 @@ C_OBJS = fclose.o fgets.o fprintf.o strdup.o calloc.o _fopen.o\
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printf.o _hextab.o vfprintf.o fdopen.o strtok.o\
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_afailed.o fopen.o fgetc.o fputc.o puts.o gets.o perror.o getchar.o\
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_printf.o vprintf.o vsprintf.o sprintf.o abort.o qsort.o putchar.o\
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errormsg.o _hadd.o cprintf.o vcprintf.o freopen.o locale.o
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errormsg.o cprintf.o vcprintf.o freopen.o locale.o
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S_OBJS = _fdesc.o \
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_file.o \
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_hadd.o \
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_heap.o \
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_oserror.o \
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_stksize.o \
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@ -1,107 +0,0 @@
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/*
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* _hadd.c
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*
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* Ullrich von Bassewitz, 19.06.1998
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*/
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#include <stddef.h>
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#include "_heap.h"
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void _hadd (void* mem, size_t size)
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/* Add an arbitrary memory block to the heap. This function is used by
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* free(), but it does also allow usage of otherwise unused memory
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* blocks as heap space. The given block is entered in the free list
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* without any checks, so beware!
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*/
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{
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struct freeblock* f;
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struct freeblock* left;
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struct freeblock* right;
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if (size >= sizeof (struct freeblock)) {
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/* Set the admin data */
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f = (struct freeblock*) mem;
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f->size = size;
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/* Check if the freelist is empty */
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if (_hfirst == 0) {
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/* The freelist is empty until now, insert the block */
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f->prev = 0;
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f->next = 0;
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_hfirst = f;
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_hlast = f;
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} else {
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/* We have to search the free list. As we are doing so, we check
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* if it is possible to combine this block with another already
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* existing block. Beware: The block may be the "missing link"
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* between *two* other blocks.
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*/
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left = 0;
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right = _hfirst;
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while (right && f > right) {
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left = right;
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right = right->next;
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}
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/* Ok, the current block must be inserted between left and right (but
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* beware: one of the two may be zero!). Also check for the condition
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* that we have to merge two or three blocks.
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*/
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if (right) {
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/* Check if we must merge the block with the right one */
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if (((unsigned) f) + size == (unsigned) right) {
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/* Merge with the right block */
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f->size += right->size;
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if (f->next = right->next) {
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f->next->prev = f;
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} else {
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/* This is now the last block */
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_hlast = f;
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}
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} else {
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/* No merge, just set the link */
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f->next = right;
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right->prev = f;
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}
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} else {
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f->next = 0;
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/* Special case: This is the new freelist end */
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_hlast = f;
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}
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if (left) {
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/* Check if we must merge the block with the left one */
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if ((unsigned) f == ((unsigned) left) + left->size) {
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/* Merge with the left block */
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left->size += f->size;
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if (left->next = f->next) {
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left->next->prev = left;
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} else {
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/* This is now the last block */
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_hlast = left;
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}
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} else {
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/* No merge, just set the link */
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left->next = f;
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f->prev = left;
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}
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} else {
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f->prev = 0;
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/* Special case: This is the new freelist start */
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_hfirst = f;
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}
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}
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}
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}
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59
libsrc/common/_hadd.s
Normal file
59
libsrc/common/_hadd.s
Normal file
@ -0,0 +1,59 @@
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;
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; Ullrich von Bassewitz, 21.7.2000
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;
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; Add a block to the heap free list
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;
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; void __fastcall__ _hadd (void* mem, size_t size);
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;
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;
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.importzp ptr1, ptr2
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.import popax
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.import hadd
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.export _hadd
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.macpack generic
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; Offsets into struct freeblock and other constant stuff
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size = 0
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next = 2
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prev = 4
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admin_space = 2
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min_size = 6
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; Code
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_hadd: sta ptr1 ; Store size in ptr1
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stx ptr1+1
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jsr popax ; Get the block pointer
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sta ptr2
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stx ptr2+1 ; Store block pointer in ptr2
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; Check if size is greater or equal than min_size. Otherwise we don't care
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; about the block (this may only happen for user supplied blocks, blocks
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; from the heap are always large enough to hold a freeblock structure).
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lda ptr1 ; Load low byte
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ldx ptr1+1 ; Load/check high byte
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bne @L1
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cmp #min_size
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bcs @L1
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rts ; Block not large enough
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; The block is large enough. Set the size field in the block.
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@L1: ldy #size
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sta (ptr2),y
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iny
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txa
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sta (ptr2),y
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; Call the internal function since variables are now setup correctly
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jmp hadd
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@ -59,10 +59,9 @@
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; }
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;
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.importzp ptr1, ptr2
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.import __hptr, __hfirst, __hlast
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.import pushax, __hadd
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.export _free
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.importzp ptr1, ptr2, ptr3, ptr4
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.import __hptr, __hfirst, __hlast, __hend
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.export _free, hadd
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.macpack generic
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@ -77,66 +76,66 @@ min_size = 6
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; Code
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_free: sta ptr1
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stx ptr1+1 ; Save block
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_free: sta ptr2
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stx ptr2+1 ; Save block
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; Is the argument NULL?
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ora ptr1+1 ; Is the argument NULL?
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ora ptr2+1 ; Is the argument NULL?
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beq @L9 ; Jump if yes
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; Decrement the given pointer by the admin space amount, so it points to the
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; real block allocated. The size of the block is stored in the admin space.
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; Remember the block size in ptr2.
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; Remember the block size in ptr1.
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lda ptr1
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lda ptr2
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sub #admin_space
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sta ptr1
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bcs @L1
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dec ptr1+1
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@L1: ldy #size+1
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lda (ptr1),y ; High byte of size
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sta ptr2+1 ; Save it
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dey
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lda (ptr1),y
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sta ptr2
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bcs @L1
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dec ptr2+1
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@L1: ldy #size+1
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lda (ptr2),y ; High byte of size
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sta ptr1+1 ; Save it
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dey
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lda (ptr2),y
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sta ptr1
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; Check if the block is on top of the heap
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add ptr1
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add ptr2
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tay
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lda ptr1+1
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adc ptr2+1
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lda ptr2+1
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adc ptr1+1
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cpy __hptr
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bne @AddToFreeList
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bne hadd ; Add to free list
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cmp __hptr+1
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bne @AddToFreeList
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bne hadd
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; The pointer is located at the heap top. Lower the heap top pointer to
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; release the block.
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@L3: lda ptr1
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@L3: lda ptr2
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sta __hptr
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lda ptr1+1
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lda ptr2+1
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sta __hptr+1
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; Check if the last block in the freelist is now at heap top. If so, remove
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; this block from the freelist.
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lda __hlast
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sta ptr2
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sta ptr1
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ora __hlast+1
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beq @L9 ; Jump if free list empty
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lda __hlast+1
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sta ptr2+1 ; Pointer to last block now in ptr2
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sta ptr1+1 ; Pointer to last block now in ptr1
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ldy #size
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lda (ptr2),y ; Low byte of block size
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add ptr2
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lda (ptr1),y ; Low byte of block size
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add ptr1
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tax
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iny ; High byte of block size
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lda (ptr2),y
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adc ptr2+1
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lda (ptr1),y
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adc ptr1+1
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cmp __hptr+1
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bne @L9 ; Jump if last block not on top of heap
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@ -145,20 +144,20 @@ _free: sta ptr1
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; Remove the last block
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lda ptr2
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lda ptr1
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sta __hptr
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lda ptr2+1
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lda ptr1+1
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sta __hptr+1
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; Correct the next pointer of the now last block
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ldy #prev+1 ; Offset of ->prev field
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lda (ptr2),y
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sta ptr1+1 ; Remember f->prev in ptr1
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lda (ptr1),y
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sta ptr2+1 ; Remember f->prev in ptr2
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sta __hlast+1
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dey
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lda (ptr2),y
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sta ptr1 ; Remember f->prev in ptr1
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lda (ptr1),y
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sta ptr2 ; Remember f->prev in ptr2
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sta __hlast
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ora __hlast+1 ; -> prev == 0?
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bne @L8 ; Jump if free list not empty
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@ -172,25 +171,366 @@ _free: sta ptr1
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@L9: rts
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; Block before is now last block. ptr1 points to f->prev.
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; Block before is now last block. ptr2 points to f->prev.
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@L8: lda #$00
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dey ; Points to high byte of ->next
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sta (ptr1),y
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sta (ptr2),y
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dey ; Low byte of f->prev->next
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sta (ptr2),y
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rts ; Done
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; The block is not on top of the heap. Add it to the free list. This was
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; formerly a separate function called __hadd that was implemented in C as
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; shown here:
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;
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; void _hadd (void* mem, size_t size)
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; /* Add an arbitrary memory block to the heap. This function is used by
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; * free(), but it does also allow usage of otherwise unused memory
|
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; * blocks as heap space. The given block is entered in the free list
|
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; * without any checks, so beware!
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; */
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; {
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; struct freeblock* f;
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; struct freeblock* left;
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; struct freeblock* right;
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;
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; if (size >= sizeof (struct freeblock)) {
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;
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; /* Set the admin data */
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; f = (struct freeblock*) mem;
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; f->size = size;
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;
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; /* Check if the freelist is empty */
|
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; if (_hfirst == 0) {
|
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;
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; /* The freelist is empty until now, insert the block */
|
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; f->prev = 0;
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; f->next = 0;
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; _hfirst = f;
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; _hlast = f;
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;
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; } else {
|
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;
|
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; /* We have to search the free list. As we are doing so, we check
|
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; * if it is possible to combine this block with another already
|
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; * existing block. Beware: The block may be the "missing link"
|
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; * between *two* other blocks.
|
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; */
|
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; left = 0;
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; right = _hfirst;
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; while (right && f > right) {
|
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; left = right;
|
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; right = right->next;
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; }
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||||
;
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||||
;
|
||||
; /* Ok, the current block must be inserted between left and right (but
|
||||
; * beware: one of the two may be zero!). Also check for the condition
|
||||
; * that we have to merge two or three blocks.
|
||||
; */
|
||||
; if (right) {
|
||||
; /* Check if we must merge the block with the right one */
|
||||
; if (((unsigned) f) + size == (unsigned) right) {
|
||||
; /* Merge with the right block */
|
||||
; f->size += right->size;
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||||
; if (f->next = right->next) {
|
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; f->next->prev = f;
|
||||
; } else {
|
||||
; /* This is now the last block */
|
||||
; _hlast = f;
|
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; }
|
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; } else {
|
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; /* No merge, just set the link */
|
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; f->next = right;
|
||||
; right->prev = f;
|
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; }
|
||||
; } else {
|
||||
; f->next = 0;
|
||||
; /* Special case: This is the new freelist end */
|
||||
; _hlast = f;
|
||||
; }
|
||||
; if (left) {
|
||||
; /* Check if we must merge the block with the left one */
|
||||
; if ((unsigned) f == ((unsigned) left) + left->size) {
|
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; /* Merge with the left block */
|
||||
; left->size += f->size;
|
||||
; if (left->next = f->next) {
|
||||
; left->next->prev = left;
|
||||
; } else {
|
||||
; /* This is now the last block */
|
||||
; _hlast = left;
|
||||
; }
|
||||
; } else {
|
||||
; /* No merge, just set the link */
|
||||
; left->next = f;
|
||||
; f->prev = left;
|
||||
; }
|
||||
; } else {
|
||||
; f->prev = 0;
|
||||
; /* Special case: This is the new freelist start */
|
||||
; _hfirst = f;
|
||||
; }
|
||||
; }
|
||||
; }
|
||||
; }
|
||||
;
|
||||
|
||||
; Check if the free list is empty, storing _hfirst into ptr3 for later
|
||||
|
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hadd: lda __hfirst
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sta ptr3
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lda __hfirst+1
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sta ptr3+1
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ora ptr3
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bne SearchFreeList
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|
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; The free list is empty, so this is the first and only block. A contains
|
||||
; zero if we come here.
|
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|
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ldy #next-1
|
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@L2: iny ; f->next = f->prev = 0;
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sta (ptr2),y
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cpy #prev+1 ; Done?
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bne @L2
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|
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lda ptr2
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ldx ptr2+1
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sta __hfirst
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stx __hfirst+1 ; _hfirst = f;
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sta __hlast
|
||||
stx __hlast+1 ; _hlast = f;
|
||||
|
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rts ; Done
|
||||
|
||||
; We have to search the free list. As we are doing so, check if it is possible
|
||||
; to combine this block with another, already existing block. Beware: The
|
||||
; block may be the "missing link" between two blocks.
|
||||
; ptr3 contains _hfirst (the start value of the search) when execution reaches
|
||||
; this point, Y contains size+1. We do also know that _hfirst (and therefore
|
||||
; ptr3) is not zero on entry.
|
||||
|
||||
SearchFreeList:
|
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lda #0
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sta ptr4
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sta ptr4+1 ; left = 0;
|
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ldy #next+1
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ldx ptr3
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|
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@Loop: lda ptr3+1 ; High byte of right
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cmp ptr2+1
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bne @L1
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cpx ptr2
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beq @L2
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@L1: bcs CheckRightMerge
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|
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@L2: stx ptr4 ; left = right;
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||||
sta ptr4+1
|
||||
|
||||
dey ; Points to next
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||||
lda (ptr3),y ; right = right->next;
|
||||
tax
|
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iny ; Points to next+1
|
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lda (ptr3),y
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stx ptr3
|
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sta ptr3+1
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ora ptr3
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bne @Loop
|
||||
|
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; If we come here, the right pointer is zero, so we don't need to check for
|
||||
; a merge. The new block is the new freelist end.
|
||||
; A is zero when we come here, Y points to next+1
|
||||
|
||||
sta (ptr2),y ; Clear high byte of f->next
|
||||
dey
|
||||
sta (ptr2),y ; Clear low byte of f->next
|
||||
|
||||
lda ptr2 ; _hlast = f;
|
||||
sta __hlast
|
||||
lda ptr2+1
|
||||
sta __hlast+1
|
||||
|
||||
; Since we have checked the case that the freelist is empty before, if the
|
||||
; right pointer is NULL, the left *cannot* be NULL here. So skip the
|
||||
; pointer check and jump right to the left block merge
|
||||
|
||||
jmp CheckLeftMerge2
|
||||
|
||||
; The given block must be inserted between left and right, and right is not
|
||||
; zero.
|
||||
|
||||
CheckRightMerge:
|
||||
lda ptr2
|
||||
add ptr1 ; f + size
|
||||
tax
|
||||
lda ptr2+1
|
||||
adc ptr1+1
|
||||
|
||||
cpx ptr3
|
||||
bne NoRightMerge
|
||||
cmp ptr3+1
|
||||
bne NoRightMerge
|
||||
|
||||
; Merge with the right block. Do f->size += right->size;
|
||||
|
||||
ldy #size
|
||||
lda ptr1
|
||||
add (ptr3),y
|
||||
sta (ptr2),y
|
||||
iny ; Points to size+1
|
||||
lda ptr1+1
|
||||
adc (ptr3),y
|
||||
sta (ptr2),y
|
||||
|
||||
; Set f->next = right->next and remember f->next in ptr1 (we don't need the
|
||||
; size stored there any longer)
|
||||
|
||||
iny ; Points to next
|
||||
lda (ptr3),y ; Low byte of right->next
|
||||
sta (ptr2),y ; Store to low byte of f->next
|
||||
sta ptr1
|
||||
iny ; Points to next+1
|
||||
lda (ptr3),y ; High byte of right->next
|
||||
sta (ptr2),y ; Store to high byte of f->next
|
||||
sta ptr1+1
|
||||
ora ptr1
|
||||
beq @L1 ; Jump if f->next zero
|
||||
|
||||
; f->next->prev = f;
|
||||
|
||||
iny ; Points to prev
|
||||
lda ptr2 ; Low byte of f
|
||||
sta (ptr1),y ; Low byte of f->next->prev
|
||||
iny ; Points to prev+1
|
||||
lda ptr2+1 ; High byte of f
|
||||
sta (ptr1),y ; High byte of f->next->prev
|
||||
jmp CheckLeftMerge ; Done
|
||||
|
||||
; f->next is zero, this is now the last block
|
||||
|
||||
@L1: lda ptr2 ; _hlast = f;
|
||||
sta __hlast
|
||||
lda ptr2+1
|
||||
sta __hlast+1
|
||||
jmp CheckLeftMerge
|
||||
|
||||
; No right merge, just set the link.
|
||||
|
||||
NoRightMerge:
|
||||
ldy #next ; f->next = right;
|
||||
lda ptr3
|
||||
sta (ptr2),y
|
||||
iny ; Points to next+1
|
||||
lda ptr3+1
|
||||
sta (ptr2),y
|
||||
|
||||
iny ; Points to prev
|
||||
lda ptr2 ; right->prev = f;
|
||||
sta (ptr3),y
|
||||
iny ; Points to prev+1
|
||||
lda ptr2+1
|
||||
sta (ptr3),y
|
||||
|
||||
; Check if the left pointer is zero
|
||||
|
||||
CheckLeftMerge:
|
||||
lda ptr4 ; left == NULL?
|
||||
ora ptr4+1
|
||||
bne CheckLeftMerge2 ; Jump if there is a left block
|
||||
|
||||
; We don't have a left block, so f is actually the new freelist start
|
||||
|
||||
ldy #prev
|
||||
sta (ptr2),y ; f->prev = 0;
|
||||
iny
|
||||
sta (ptr2),y
|
||||
|
||||
lda ptr2 ; _hfirst = f;
|
||||
sta __hfirst
|
||||
lda ptr2+1
|
||||
sta __hfirst+1
|
||||
|
||||
rts ; Done
|
||||
|
||||
; Check if the left block is adjacent to the following one
|
||||
|
||||
CheckLeftMerge2:
|
||||
ldy #size ; Calculate left + left->size
|
||||
lda (ptr4),y ; Low byte of left->size
|
||||
add ptr4
|
||||
tax
|
||||
iny ; Points to size+1
|
||||
lda (ptr4),y ; High byte of left->size
|
||||
adc ptr4+1
|
||||
|
||||
cpx ptr2
|
||||
bne NoLeftMerge
|
||||
cmp ptr2+1
|
||||
bne NoLeftMerge ; Jump if blocks not adjacent
|
||||
|
||||
; Merge with the left block. Do left->size += f->size;
|
||||
|
||||
dey ; Points to size
|
||||
lda (ptr4),y
|
||||
add (ptr2),y
|
||||
sta (ptr4),y
|
||||
iny ; Points to size+1
|
||||
lda (ptr4),y
|
||||
adc (ptr2),y
|
||||
sta (ptr4),y
|
||||
|
||||
; Set left->next = f->next and remember left->next in ptr1.
|
||||
|
||||
iny ; Points to next
|
||||
lda (ptr2),y ; Low byte of f->next
|
||||
sta (ptr4),y
|
||||
sta ptr1
|
||||
iny ; Points to next+1
|
||||
lda (ptr2),y ; High byte of f->next
|
||||
sta (ptr4),y
|
||||
sta ptr1+1
|
||||
ora ptr1 ; left->next == NULL?
|
||||
beq @L1
|
||||
|
||||
; Do left->next->prev = left
|
||||
|
||||
iny ; Points to prev
|
||||
lda ptr4 ; Low byte of left
|
||||
sta (ptr1),y
|
||||
iny
|
||||
lda ptr4+1 ; High byte of left
|
||||
sta (ptr1),y
|
||||
rts ; Done
|
||||
|
||||
; The block is not on top of the heap. Add it to the free list.
|
||||
; This is now the last block, do _hlast = left
|
||||
|
||||
@L1: lda ptr4
|
||||
sta __hlast
|
||||
lda ptr4+1
|
||||
sta __hlast+1
|
||||
rts ; Done
|
||||
|
||||
; No merge of the left block, just set the link. Y points to size+1 if
|
||||
; we come here. Do left->next = f.
|
||||
|
||||
NoLeftMerge:
|
||||
iny ; Points to next
|
||||
lda ptr2 ; Low byte of left
|
||||
sta (ptr4),y
|
||||
iny
|
||||
lda ptr2+1 ; High byte of left
|
||||
sta (ptr4),y
|
||||
|
||||
; Do f->prev = left
|
||||
|
||||
iny ; Points to prev
|
||||
lda ptr4
|
||||
sta (ptr2),y
|
||||
iny
|
||||
lda ptr4+1
|
||||
sta (ptr2),y
|
||||
rts ; Done
|
||||
|
||||
@AddToFreeList:
|
||||
lda ptr1
|
||||
ldx ptr1+1
|
||||
jsr pushax ; Push b
|
||||
lda ptr2
|
||||
ldx ptr2+1
|
||||
jsr pushax ; Push size
|
||||
jmp __hadd ; Add to free list and return
|
||||
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user