diff options
Diffstat (limited to 'ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.asm')
| -rwxr-xr-x | ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.asm | 122 |
1 files changed, 61 insertions, 61 deletions
diff --git a/ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.asm b/ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.asm index ca8d06a550..d0faa00d1e 100755 --- a/ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.asm +++ b/ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.asm @@ -38,16 +38,16 @@ InternalMemCopyMem ( )
**/
EXPORT InternalMemCopyMem
- - AREA AsmMemStuff, CODE, READONLY +
+ AREA AsmMemStuff, CODE, READONLY
InternalMemCopyMem
- stmfd sp!, {r4-r11, lr} - // Save the input parameters in extra registers (r11 = destination, r14 = source, r12 = length) - mov r11, r0 - mov r10, r0 - mov r12, r2 - mov r14, r1 + stmfd sp!, {r4-r11, lr}
+ // Save the input parameters in extra registers (r11 = destination, r14 = source, r12 = length)
+ mov r11, r0
+ mov r10, r0
+ mov r12, r2
+ mov r14, r1
memcopy_check_overlapped
cmp r11, r1
@@ -70,42 +70,42 @@ memcopy_check_overlapped memcopy_check_optim_default
// Check if we can use an optimized path ((length >= 32) && destination word-aligned && source word-aligned) for the memcopy (optimized path if r0 == 1)
tst r0, #0xF
- movne r0, #0 - bne memcopy_default - tst r1, #0xF - movne r3, #0 - moveq r3, #1 - cmp r2, #31 - movls r0, #0 - andhi r0, r3, #1 - b memcopy_default - -memcopy_check_optim_overlap - // r10 = dest_end, r14 = source_end - add r10, r11, r12 - add r14, r12, r1 - - // Are we in the optimized case ((length >= 32) && dest_end word-aligned && source_end word-aligned) - cmp r2, #31 - movls r0, #0 - movhi r0, #1 - tst r10, #0xF - movne r0, #0 - tst r14, #0xF - movne r0, #0 + movne r0, #0
+ bne memcopy_default
+ tst r1, #0xF
+ movne r3, #0
+ moveq r3, #1
+ cmp r2, #31
+ movls r0, #0
+ andhi r0, r3, #1
+ b memcopy_default
+
+memcopy_check_optim_overlap
+ // r10 = dest_end, r14 = source_end
+ add r10, r11, r12
+ add r14, r12, r1
+
+ // Are we in the optimized case ((length >= 32) && dest_end word-aligned && source_end word-aligned)
+ cmp r2, #31
+ movls r0, #0
+ movhi r0, #1
+ tst r10, #0xF
+ movne r0, #0
+ tst r14, #0xF
+ movne r0, #0
b memcopy_overlapped
- +
memcopy_overlapped_non_optim
// We read 1 byte from the end of the source buffer
- sub r3, r14, #1 - sub r12, r12, #1 - ldrb r3, [r3, #0] - sub r2, r10, #1 - cmp r12, #0 + sub r3, r14, #1
+ sub r12, r12, #1
+ ldrb r3, [r3, #0]
+ sub r2, r10, #1
+ cmp r12, #0
// We write 1 byte at the end of the dest buffer
- sub r10, r10, #1 - sub r14, r14, #1 - strb r3, [r2, #0] + sub r10, r10, #1
+ sub r14, r14, #1
+ strb r3, [r2, #0]
bne memcopy_overlapped_non_optim
b memcopy_end
@@ -114,16 +114,16 @@ memcopy_overlapped // Are we in the optimized case ?
cmp r0, #0
beq memcopy_overlapped_non_optim
- +
// Optimized Overlapped - Read 32 bytes
sub r14, r14, #32
sub r12, r12, #32
cmp r12, #31
ldmia r14, {r2-r9}
- +
// If length is less than 32 then disable optim
movls r0, #0
- +
cmp r12, #0
// Optimized Overlapped - Write 32 bytes
@@ -136,37 +136,37 @@ memcopy_overlapped memcopy_default_non_optim
// Byte copy
- ldrb r3, [r14], #1 - sub r12, r12, #1 - strb r3, [r10], #1 - + ldrb r3, [r14], #1
+ sub r12, r12, #1
+ strb r3, [r10], #1
+
memcopy_default
- cmp r12, #0 - beq memcopy_end - + cmp r12, #0
+ beq memcopy_end
+
// r10 = dest, r14 = source
memcopy_default_loop
- cmp r0, #0 + cmp r0, #0
beq memcopy_default_non_optim
- +
// Optimized memcopy - Read 32 Bytes
- sub r12, r12, #32 - cmp r12, #31 - ldmia r14!, {r2-r9} + sub r12, r12, #32
+ cmp r12, #31
+ ldmia r14!, {r2-r9}
// If length is less than 32 then disable optim
- movls r0, #0 + movls r0, #0
- cmp r12, #0 + cmp r12, #0
// Optimized memcopy - Write 32 Bytes
- stmia r10!, {r2-r9} - + stmia r10!, {r2-r9}
+
// while (length != 0)
bne memcopy_default_loop
- +
memcopy_end
- mov r0, r11 + mov r0, r11
ldmfd sp!, {r4-r11, pc}
END
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