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/*
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
.text
.align
.global rotate90CW_4x4_16v6
// Rotates 90deg CW a 4x4 block of 16bpp pixels using ARMv6
// src and dst must be 4 pixels-aligned (2-pixels aligned might
// actually work)
//
// The code below is complicated by ARM's little endianness.
rotate90CW_4x4_16v6:
// r0 = dst
// r1 = src
// r2 = dst stride in pixels
// r3 = src stride in pixels
stmfd sp!, {r4,r5, r6,r7, r8,r9, r10,r11, lr}
add r14, r3, r3
add r12, r2, r2
ldrd r2, r3, [r1], r14
ldrd r4, r5, [r1], r14
ldrd r6, r7, [r1], r14
ldrd r8, r9, [r1]
pkhbt r10, r8, r6, lsl #16
pkhbt r11, r4, r2, lsl #16
strd r10, r11, [r0], r12
pkhtb r10, r6, r8, asr #16
pkhtb r11, r2, r4, asr #16
strd r10, r11, [r0], r12
pkhbt r10, r9, r7, lsl #16
pkhbt r11, r5, r3, lsl #16
strd r10, r11, [r0], r12
pkhtb r10, r7, r9, asr #16
pkhtb r11, r3, r5, asr #16
strd r10, r11, [r0]
ldmfd sp!, {r4,r5, r6,r7, r8,r9, r10,r11, pc}
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