diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/CompilerStub/x64/memsetSSE2.asm')
-rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/CompilerStub/x64/memsetSSE2.asm | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/CompilerStub/x64/memsetSSE2.asm b/EdkCompatibilityPkg/Foundation/Library/CompilerStub/x64/memsetSSE2.asm new file mode 100644 index 0000000000..0370c9be71 --- /dev/null +++ b/EdkCompatibilityPkg/Foundation/Library/CompilerStub/x64/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:
+;
+;------------------------------------------------------------------------------
+
+ .code
+
+;------------------------------------------------------------------------------
+; VOID *
+; memset (
+; OUT VOID *Buffer, --> rcx
+; IN UINT8 Value, --> rdx
+; IN UINTN Length --> r8
+; );
+;------------------------------------------------------------------------------
+memset PROC USES rdi
+ mov rax, rcx
+ cmp r8, 0 ; if Size == 0, do nothing
+ je @SetDone
+ mov rax, rdx ; rdx <-> r8
+ mov rdx, r8 ; rdx <- Length
+ mov r8, rax ; r8 <- Value
+
+ mov rdi, rcx ; rdi <- Buffer
+ mov al, r8b ; al <- Value
+ mov r9, rdi ; r9 <- Buffer as return value
+ xor rcx, rcx
+ sub rcx, rdi
+ and rcx, 15 ; rcx + rdi aligns on 16-byte boundary
+ jz @F
+ cmp rcx, rdx
+ cmova rcx, rdx
+ sub rdx, rcx
+ rep stosb
+@@:
+ mov rcx, rdx
+ and rdx, 15
+ shr rcx, 4
+ jz @SetBytes
+ mov ah, al ; ax <- Value repeats twice
+ movd xmm0, eax ; xmm0[0..16] <- Value repeats twice
+ pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times
+ movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times
+@@:
+ movdqa [rdi], xmm0 ; rdi should be 16-byte aligned
+ add rdi, 16
+ loop @B
+@SetBytes:
+ mov ecx, edx ; high 32 bits of rcx are always zero
+ rep stosb
+ mov rax, r9 ; rax <- Return value
+@SetDone:
+ ret
+memset ENDP
+
+ END
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