From abc067494646e5e908cb3b6c5818386886a0c81d Mon Sep 17 00:00:00 2001
From: teodor <teodor>
Date: Tue, 22 Nov 2005 16:07:28 +0000
Subject: [PATCH] Optimize mcrealloc

---
 memtest.c |  2 +-
 tmalloc.c | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/memtest.c b/memtest.c
index 7db7813..9abf087 100644
--- a/memtest.c
+++ b/memtest.c
@@ -118,7 +118,7 @@ main(int argn, char *argv[]) {
 		printf("mixed:%s free:%d\n", ptr, base->chunk->freesize);
 
 		ptr = mcrealloc(ptr1, 120); 
-		tassert( ptr<ptr1 );
+		tassert( ptr==ptr1 );
 		printf("mixed:%s free:%d\n", ptr, base->chunk->freesize);
 	
 		ptr1 = mcalloc(base, CNTXCHUNK);
diff --git a/tmalloc.c b/tmalloc.c
index fee18cb..9f96ab9 100644
--- a/tmalloc.c
+++ b/tmalloc.c
@@ -188,10 +188,10 @@ mcalloc(MemoryContext *cntx, size_t size) {
 		chunk = newchunk;
 	}
 
-	chunk->freesize -= size;
-	alloc = (MCAllocatedSpace*)( chunk->data + chunk->freesize );
+	alloc = (MCAllocatedSpace*)( chunk->data + chunk->size - chunk->freesize );
 	alloc->size = size; 
 	alloc->cntx = cntx;
+	chunk->freesize -= size;
  
 	if ( cntx->flags & MC_DEBUG ) {
 		*(u_int32_t*)((char*)alloc + alloc->size - sizeof(u_int32_t) ) = MCMAGICKNUMBER;
@@ -223,14 +223,12 @@ mcrealloc(void * ptr, size_t size) {
 		realsize = alloc->size - MCASHDRSZ;
 
 	if ( size > realsize ) {
-		if ( (char*)alloc == alloc->cntx->chunk->data + alloc->cntx->chunk->freesize && 
+		MemoryChunk *chunk = alloc->cntx->chunk;
+		if ( (char*)alloc == chunk->data + chunk->size - chunk->freesize - alloc->size &&
 				PTRALIGN(size)-realsize <= alloc->cntx->chunk->freesize ) {
 			/* just enlarge */
 			alloc->cntx->chunk->freesize -= PTRALIGN(size)-realsize;
 			alloc->size+=PTRALIGN(size)-realsize;
-			memmove( ((char*)alloc) - (PTRALIGN(size)-realsize), alloc, PTRALIGN(size)+MCASHDRSZ );
-			alloc = (MCAllocatedSpace*) ( ((char*)alloc) - (PTRALIGN(size)-realsize) );
-			ptr = (void*)alloc->data;
 			if ( alloc->cntx->flags & MC_DEBUG ) {
 				memset( (char*)(alloc->data) + realsize,  0xc3, PTRALIGN(size)-realsize );
 				*(u_int32_t*)((char*)alloc + alloc->size - sizeof(u_int32_t) ) = MCMAGICKNUMBER;
@@ -251,6 +249,7 @@ mcrealloc(void * ptr, size_t size) {
 void    
 mcfree(void * ptr) {
 	MCAllocatedSpace	*alloc = (MCAllocatedSpace*)( (char*)ptr - MCASHDRSZ );
+	MemoryChunk *chunk;
 
 	if ( ptr==NULL )
 		tlog(TL_CRIT|TL_EXIT, "mcfree: free null pointer");
@@ -258,7 +257,8 @@ mcfree(void * ptr) {
 	if ( alloc->cntx->flags & MC_DEBUG ) 
 		tassert(  *(u_int32_t*)((char*)alloc + alloc->size - sizeof(u_int32_t) ) == MCMAGICKNUMBER );
 
-	if ( (char*)alloc == alloc->cntx->chunk->data + alloc->cntx->chunk->freesize ) /* last allocated value */
+	chunk = alloc->cntx->chunk;
+	if ( (char*)alloc == chunk->data + chunk->size - chunk->freesize - alloc->size ) /* last allocated value */
 		alloc->cntx->chunk->freesize+=alloc->size;
 
 	alloc->cntx=NULL;
-- 
2.46.1