diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLib/SetMem.c')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLib/SetMem.c | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/MdePkg/Library/BaseMemoryLib/SetMem.c b/MdePkg/Library/BaseMemoryLib/SetMem.c index 5e74085c56..b6fb811c38 100644 --- a/MdePkg/Library/BaseMemoryLib/SetMem.c +++ b/MdePkg/Library/BaseMemoryLib/SetMem.c @@ -5,6 +5,9 @@ is desired.
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>
+ Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
+
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@@ -43,11 +46,42 @@ InternalMemSetMem ( // volatile to prevent the optimizer from replacing this function with
// the intrinsic memset()
//
- volatile UINT8 *Pointer;
+ volatile UINT8 *Pointer8;
+ volatile UINT32 *Pointer32;
+ volatile UINT64 *Pointer64;
+ UINT32 Value32;
+ UINT64 Value64;
+
+ if ((((UINTN)Buffer & 0x7) == 0) && (Length >= 8)) {
+ // Generate the 64bit value
+ Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;
+ Value64 = LShiftU64 (Value32, 32) | Value32;
+
+ Pointer64 = (UINT64*)Buffer;
+ while (Length >= 8) {
+ *(Pointer64++) = Value64;
+ Length -= 8;
+ }
- Pointer = (UINT8*)Buffer;
+ // Finish with bytes if needed
+ Pointer8 = (UINT8*)Pointer64;
+ } else if ((((UINTN)Buffer & 0x3) == 0) && (Length >= 4)) {
+ // Generate the 32bit value
+ Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;
+
+ Pointer32 = (UINT32*)Buffer;
+ while (Length >= 4) {
+ *(Pointer32++) = Value32;
+ Length -= 4;
+ }
+
+ // Finish with bytes if needed
+ Pointer8 = (UINT8*)Pointer32;
+ } else {
+ Pointer8 = (UINT8*)Buffer;
+ }
while (Length-- > 0) {
- *(Pointer++) = Value;
+ *(Pointer8++) = Value;
}
return Buffer;
}
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