diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.S')
| -rw-r--r-- | Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.S b/Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.S new file mode 100644 index 0000000000..48f4ae037e --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.S @@ -0,0 +1,44 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, Intel Corporation. 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
+# 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:
+#
+# MultU64x64.S
+#
+# Abstract:
+#
+# Calculate the product of a 64-bit integer and another 64-bit integer
+#
+#------------------------------------------------------------------------------
+
+ASM_GLOBAL ASM_PFX(InternalMathMultU64x64)
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# InternalMathMultU64x64 (
+# IN UINT64 Multiplicand,
+# IN UINT64 Multiplier
+# );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalMathMultU64x64):
+ push %ebx
+ movl 8(%esp), %ebx # ebx <- M1[0..31]
+ movl 16(%esp), %edx # edx <- M2[0..31]
+ movl %ebx, %ecx
+ movl %edx, %eax
+ imull 20(%esp), %ebx # ebx <- M1[0..31] * M2[32..63]
+ imull 12(%esp), %edx # edx <- M1[32..63] * M2[0..31]
+ addl %edx, %ebx # carries are abandoned
+ mull %ecx # edx:eax <- M1[0..31] * M2[0..31]
+ addl %ebx, %edx # carries are abandoned
+ pop %ebx
+ ret
|