Changeset 87185 in vbox for trunk/src/VBox/Runtime/common

Timestamp:

Jan 6, 2021 12:27:54 PM (4 years ago)

Author:

vboxsync

Message:

IPRT: Added generic ASMMemFill32, ASMMemZero32 and ASMMemFirstMismatchingU8 C implementations. bugref:9898

Location:

trunk/src/VBox/Runtime/common/asm

Files:

• ASMMemFill32-generic.cpp (copied) (copied from trunk/src/VBox/Runtime/common/asm/ASMMemZeroPage-generic.cpp ) (1 diff)
• ASMMemFirstMismatchingU8-generic.cpp (copied) (copied from trunk/src/VBox/Runtime/common/asm/ASMMemZeroPage-generic.cpp ) (2 diffs)
• ASMMemZero32-generic.cpp (copied) (copied from trunk/src/VBox/Runtime/common/asm/ASMMemZeroPage-generic.cpp ) (2 diffs)

trunk/src/VBox/Runtime/common/asm/ASMMemFill32-generic.cpp

@@ -33 +33 @@
 
 #include <iprt/string.h>
+#include <iprt/assert.h>
 
 
-RT_ASM_DECL_PRAGMA_WATCOM(void) ASMMemZeroPage(volatile void RT_FAR *pv) RT_NOTHROW_DEF
+RT_ASM_DECL_PRAGMA_WATCOM(void) ASMMemFill32(volatile void RT_FAR *pv, size_t cb, uint32_t u32) RT_NOTHROW_DEF
 {
-    memset((void *)pv, 0, RT_ASM_PAGE_SIZE);
+    Assert(!(cb & 3));
+    size_t cFills = cb / sizeof(uint32_t);
+    uint32_t *pu32Dst = (uint32_t *)pv;
+
+    while (cFills >= 8)
+    {
+        pu32Dst[0] = u32;
+        pu32Dst[1] = u32;
+        pu32Dst[2] = u32;
+        pu32Dst[3] = u32;
+        pu32Dst[4] = u32;
+        pu32Dst[5] = u32;
+        pu32Dst[6] = u32;
+        pu32Dst[7] = u32;
+        pu32Dst += 8;
+        cFills  -= 8;
+    }
+
+    while (cFills > 0)
+    {
+        *pu32Dst++ = u32;
+        cFills -= 1;
+    }
 }
 

trunk/src/VBox/Runtime/common/asm/ASMMemFirstMismatchingU8-generic.cpp

@@ -5 +5 @@
 
 /*
- * Copyright (C) 2021 Oracle Corporation
+ * Copyright (C) 2006-2021 Oracle Corporation
  *
  * This file is part of VirtualBox Open Source Edition (OSE), as
@@ -32 +32 @@
 #include "internal/iprt.h"
 
-#include <iprt/string.h>
 
-
-RT_ASM_DECL_PRAGMA_WATCOM(void) ASMMemZeroPage(volatile void RT_FAR *pv) RT_NOTHROW_DEF
+DECLASM(void *) ASMMemFirstMismatchingU8(void const RT_FAR *pv, size_t cb, uint8_t u8) RT_NOTHROW_DEF
 {
-    memset((void *)pv, 0, RT_ASM_PAGE_SIZE);
+    uint8_t const *pb = (uint8_t const RT_FAR *)pv;
+    for (; cb; cb--, pb++)
+        if (RT_LIKELY(*pb == u8))
+        { /* likely */ }
+        else
+            return (void *)pb;
+    return NULL;
 }
 

trunk/src/VBox/Runtime/common/asm/ASMMemZero32-generic.cpp

@@ -1 +1 @@
 /* $Id$ */
 /** @file
- * IPRT - ASMMemZeroPage - generic C implementation.
+ * IPRT - ASMMemZero32 - generic C implementation.
  */
 
@@ -35 +35 @@
 
 
-RT_ASM_DECL_PRAGMA_WATCOM(void) ASMMemZeroPage(volatile void RT_FAR *pv) RT_NOTHROW_DEF
+RT_ASM_DECL_PRAGMA_WATCOM(void) ASMMemZero32(volatile void RT_FAR *pv, size_t cb) RT_NOTHROW_DEF
 {
-    memset((void *)pv, 0, RT_ASM_PAGE_SIZE);
+    memset((void *)pv, 0, cb);
 }