diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memsetSSE2.asm')
-rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memsetSSE2.asm | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memsetSSE2.asm b/EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memsetSSE2.asm new file mode 100644 index 0000000000..ce9ba64fea --- /dev/null +++ b/EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memsetSSE2.asm @@ -0,0 +1,74 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2007, Intel Corporation
+; All rights reserved. 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
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+; SetMem.asm
+;
+; Abstract:
+;
+; memset function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ .686
+ .model flat,C
+ .xmm
+ .code
+
+;------------------------------------------------------------------------------
+; VOID *
+; memset (
+; OUT VOID *Buffer,
+; IN UINT8 Value,
+; IN UINTN Count
+; )
+;------------------------------------------------------------------------------
+memset PROC USES edi
+ mov edx, [esp + 16] ; edx <- Count
+ cmp edx, 0 ; if Count == 0, do nothing
+ je @SetDone
+ mov edi, [esp + 8] ; edi <- Buffer
+ mov al, [esp + 12] ; al <- Value
+ xor ecx, ecx
+ sub ecx, edi
+ and ecx, 15 ; ecx + edi aligns on 16-byte boundary
+ jz @F
+ cmp ecx, edx
+ cmova ecx, edx
+ sub edx, ecx
+ rep stosb
+@@:
+ mov ecx, edx
+ and edx, 15
+ shr ecx, 4 ; ecx <- # of DQwords to set
+ jz @SetBytes
+ mov ah, al ; ax <- Value | (Value << 8)
+ add esp, -16
+ movd xmm0, eax
+ pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times
+ movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times
+@@:
+ movdqa [edi], xmm0 ; edi should be 16-byte aligned
+ add edi, 16
+ loop @B
+ add esp, 16 ; stack cleanup
+@SetBytes:
+ mov ecx, edx
+ rep stosb
+@SetDone:
+ mov eax, [esp + 8] ; eax <- Buffer as return value
+ ret
+memset ENDP
+
+ END
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