diff options
Diffstat (limited to 'ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.S')
| -rw-r--r-- | ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.S | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.S b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.S new file mode 100644 index 000000000..9b1273161 --- /dev/null +++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/clzsi2.S @@ -0,0 +1,57 @@ +#------------------------------------------------------------------------------ +# +# Copyright (c) 2008-2010 Apple Inc. All rights reserved. +# +# 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. +# +#------------------------------------------------------------------------------ + + .text + .align 2 + .globl ___clzsi2 +___clzsi2: + @ args = 0, pretend = 0, frame = 0 + @ frame_needed = 1, uses_anonymous_args = 0 + stmfd sp!, {r7, lr} + add r7, sp, #0 + movs r3, r0, lsr #16 + movne r3, #16 + moveq r3, #0 + movne r9, #0 + moveq r9, #16 + mov r3, r0, lsr r3 + tst r3, #65280 + movne r0, #8 + moveq r0, #0 + movne lr, #0 + moveq lr, #8 + mov r3, r3, lsr r0 + tst r3, #240 + movne r0, #4 + moveq r0, #0 + movne ip, #0 + moveq ip, #4 + mov r3, r3, lsr r0 + tst r3, #12 + movne r0, #2 + moveq r0, #0 + movne r1, #0 + moveq r1, #2 + mov r2, r3, lsr r0 + add r3, lr, r9 + add r0, r3, ip + add r1, r0, r1 + mov r0, r2, lsr #1 + eor r0, r0, #1 + ands r0, r0, #1 + mvnne r0, #0 + rsb r3, r2, #2 + and r0, r0, r3 + add r0, r1, r0 + ldmfd sp!, {r7, pc} |