diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/Ia32/MultU64x64.S')
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/MultU64x64.S | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/MultU64x64.S b/MdePkg/Library/BaseLib/Ia32/MultU64x64.S index 0aae90c6cc..8dbae8b1a9 100644 --- a/MdePkg/Library/BaseLib/Ia32/MultU64x64.S +++ b/MdePkg/Library/BaseLib/Ia32/MultU64x64.S @@ -30,15 +30,15 @@ # );
#------------------------------------------------------------------------------
ASM_PFX(InternalMathMultU64x64):
- push %ebx
- movl 8(%esp), %ebx
- movl 16(%esp), %edx
- movl %ebx, %ecx
- movl %edx, %eax
- imull 20(%esp), %ebx
- imull 12(%esp), %edx
- addl %edx, %ebx
- mull %ecx
- addl %ebx, %edx
+ 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
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