From b795b5bf2e0a8dc75956c388d0709db43e3efcf4 Mon Sep 17 00:00:00 2001
From: Quincey Koziol <koziol@hdfgroup.org>
Date: Thu, 10 Jun 2004 16:02:48 -0500
Subject: [svn-r8649] Purpose:     Code optimization

Description:
    Eliminate some operations through temporary variables in H5F_addr_encode.
Eliminate some redundant memset()'s of structures that will be completely
overwritten in the variable-length datatype code.

Platforms tested:
    Solaris 2.7 (arabica)
    FreeBSD 4.10 (sleipnir) w/parallel
---
 src/H5F.c     |  8 +++-----
 src/H5Tvlen.c | 12 +++---------
 2 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/src/H5F.c b/src/H5F.c
index 493815b..6b46ddf 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -4200,18 +4200,16 @@ void
 H5F_addr_encode(H5F_t *f, uint8_t **pp/*in,out*/, haddr_t addr)
 {
     unsigned		    i;
-    haddr_t		    tmp;
 
     assert(f);
     assert(pp && *pp);
 
     if (H5F_addr_defined(addr)) {
-	tmp = addr;
 	for (i=0; i<H5F_SIZEOF_ADDR(f); i++) {
-	    *(*pp)++ = (uint8_t)(tmp & 0xff);
-	    tmp >>= 8;
+	    *(*pp)++ = (uint8_t)(addr & 0xff);
+	    addr >>= 8;
 	}
-	assert("overflow" && 0 == tmp);
+	assert("overflow" && 0 == addr);
 
     } else {
 	for (i=0; i<H5F_SIZEOF_ADDR(f); i++)
diff --git a/src/H5Tvlen.c b/src/H5Tvlen.c
index ee3ec01..739c13c 100644
--- a/src/H5Tvlen.c
+++ b/src/H5Tvlen.c
@@ -805,7 +805,6 @@ H5T_vlen_disk_write(H5F_t *f, hid_t dxpl_id, void *_vl, void *buf, void *_bg, hs
         H5HG_t bg_hobjid;       /* "Background" VL info sequence's ID info */
 
         /* Get the length of the sequence and heap object ID from background data. */
-	HDmemset(&bg_hobjid,0,sizeof(H5HG_t));
         UINT32DECODE(bg, bg_seq_len);
 
         /* Get heap information */
@@ -858,7 +857,6 @@ H5T_vlen_disk_setnull(H5F_t *f, hid_t dxpl_id, void *_vl, void *_bg)
     uint8_t *vl=(uint8_t *)_vl; /*Pointer to the user's hvl_t information*/
     uint8_t *bg=(uint8_t *)_bg; /*Pointer to the old data hvl_t          */
     uint32_t seq_len=0;         /* Sequence length */
-    H5HG_t hobjid;              /* New VL sequence's heap ID */
     herr_t      ret_value=SUCCEED;       /* Return value */
 
     FUNC_ENTER_NOAPI_NOINIT(H5T_vlen_disk_setnull)
@@ -873,7 +871,6 @@ H5T_vlen_disk_setnull(H5F_t *f, hid_t dxpl_id, void *_vl, void *_bg)
         H5HG_t bg_hobjid;       /* "Background" VL info sequence's ID info */
 
         /* Get the length of the sequence and heap object ID from background data. */
-	HDmemset(&bg_hobjid,0,sizeof(H5HG_t));
         UINT32DECODE(bg, bg_seq_len);
 
         /* Get heap information */
@@ -891,12 +888,9 @@ H5T_vlen_disk_setnull(H5F_t *f, hid_t dxpl_id, void *_vl, void *_bg)
     /* Set the length of the sequence */
     UINT32ENCODE(vl, seq_len);
     
-    /* Set the "nil" pointer information for the heap ID */
-    HDmemset(&hobjid,0,sizeof(H5HG_t));
-
-    /* Encode the heap information */
-    H5F_addr_encode(f,&vl,hobjid.addr);
-    INT32ENCODE(vl,hobjid.idx);
+    /* Encode the "nil" heap pointer information */
+    H5F_addr_encode(f,&vl,(haddr_t)0);
+    INT32ENCODE(vl,0);
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-- 
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