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