139 lines
4.4 KiB
ArmAsm
139 lines
4.4 KiB
ArmAsm
/*
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* Copyright (c) 2013-2014, NVIDIA Corporation. All rights reserved.
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* Johnny Qiu <joqiu@nvidia.com>
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* Shu Zhang <chazhang@nvidia.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <float.h>
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#include <private/bionic_asm.h>
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ENTRY(floor) /* x in r0, r1 */
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and r3, r1, #0x80000000 /* sign(x) */
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bic r1, r1, #0x80000000 /* x = abs(x) */
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/* extract exp of x */
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lsr r2, r1, #20
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sub r2, r2, #0x3fc
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subs r2, r2, #0x3 /* r2 <- exp */
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/* |x| < 1.0? */
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blt .Lx_lt_one
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/* x < 0? */
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cmp r3, #0
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bne .Lclr_frac_neg
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/* |x| <= 2^20? */
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cmp r2, #20
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ble .Lclr_frac_r1
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/* |x| < 2^52? */
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cmp r2, #52
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blt .Lclr_frac_r0
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/* return x */
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bx lr
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.Lclr_frac_r1:
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rsb r2, r2, #20
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lsr r1, r1, r2
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lsl r1, r1, r2
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mov r0, #0
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bx lr
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.Lclr_frac_r0:
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rsb r2, r2, #52
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lsr r0, r0, r2
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lsl r0, r0, r2
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bx lr
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.Lclr_frac_neg:
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/* |x| <= 2^20? */
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cmp r2, #20
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ble .Lclr_frac_r1_neg
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/* |x| < 2^52? */
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cmp r2, #52
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blt .Lclr_frac_r0_neg
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/* return x */
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orr r1, r1, #0x80000000
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bx lr
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.Lclr_frac_r1_neg:
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rsb r2, r2, #20
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mov r3, #1
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lsl r3, r3, r2
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sub r3, r3, #1
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and r3, r1, r3
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orr r3, r3, r0
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lsr r1, r1, r2
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lsl r1, r1, r2
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mov r0, #0
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b .Lreturn_x_neg
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.Lclr_frac_r0_neg:
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rsb r2, r2, #52
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mov r3, #1
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lsl r3, r3, r2
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sub r3, r3, #1
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and r3, r0, r3
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lsr r0, r0, r2
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lsl r0, r0, r2
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b .Lreturn_x_neg
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.Lx_lt_one:
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/* x == +-0? */
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cmp r0, #0
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cmpeq r1, #0
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orreq r1, r1, r3
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bxeq lr
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/* (x > 0) ? 0 : -1 */
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mov r1, #0x00100000
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mov r0, #0
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cmp r3, #0
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movne r1, #0xc0000000
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sub r1, r1, #0x00100000
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bx lr
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.Lreturn_x_neg:
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cmp r3, #0
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orr r1, r1, #0x80000000
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bxeq lr
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vmov d16, r0, r1
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vmov.f64 d18, #1.0
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vsub.f64 d16, d16, d18
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vmov r0, r1, d16
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bx lr
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END(floor)
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ALIAS_SYMBOL(floorl, floor);
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