diff options
Diffstat (limited to 'ArmPkg/Library/CompilerIntrinsicsLib/Arm/ctzsi2.S')
| -rw-r--r-- | ArmPkg/Library/CompilerIntrinsicsLib/Arm/ctzsi2.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/ctzsi2.S b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/ctzsi2.S new file mode 100644 index 0000000000..78f29ec607 --- /dev/null +++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/ctzsi2.S @@ -0,0 +1,51 @@ +#------------------------------------------------------------------------------ +# +# 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 ___ctzsi2 +___ctzsi2: + @ args = 0, pretend = 0, frame = 0 + @ frame_needed = 0, uses_anonymous_args = 0 + @ link register save eliminated. + uxth r3, r0 + cmp r3, #0 + moveq ip, #16 + movne ip, #0 + @ lr needed for prologue + mov r0, r0, lsr ip + tst r0, #255 + movne r3, #0 + moveq r3, #8 + mov r0, r0, lsr r3 + tst r0, #15 + movne r1, #0 + moveq r1, #4 + add r3, r3, ip + mov r0, r0, lsr r1 + tst r0, #3 + movne r2, #0 + moveq r2, #2 + add r3, r3, r1 + mov r0, r0, lsr r2 + and r0, r0, #3 + add r2, r3, r2 + eor r3, r0, #1 + mov r0, r0, lsr #1 + ands r3, r3, #1 + mvnne r3, #0 + rsb r0, r0, #2 + and r0, r3, r0 + add r0, r2, r0 + bx lr |