WebSVN – CharLCD – Blame – /trunk/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.S

Rev	Author	Line No.	Line
2	mjames	1	;/ ----------------------------------------------------------------------*
		2	; Project: CMSIS DSP Library*
		3	; Title: arm_bitreversal2.S*
		4	; Description: arm_bitreversal_32 function done in assembly for maximum speed.*
		5	; Called after doing an fft to reorder the output.*
		6	; The function is loop unrolled by 2. arm_bitreversal_16 as well.*
		7	; *
		8	; $Date: 27. January 2017*
		9	; $Revision: V.1.5.1*
		10	; *
		11	; Target Processor: Cortex-M cores*
		12	; -------------------------------------------------------------------- /
		13	;/*
		14	; Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.*
		15	; *
		16	; SPDX-License-Identifier: Apache-2.0*
		17	; *
		18	; Licensed under the Apache License, Version 2.0 (the License); you may*
		19	; not use this file except in compliance with the License.*
		20	; You may obtain a copy of the License at*
		21	; *
		22	; www.apache.org/licenses/LICENSE-2.0*
		23	; *
		24	; Unless required by applicable law or agreed to in writing, software*
		25	; distributed under the License is distributed on an AS IS BASIS, WITHOUT*
		26	; WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.*
		27	; See the License for the specific language governing permissions and*
		28	; limitations under the License.*
		29	; /*
		30
		31	#if defined ( __CC_ARM ) /* Keil */
		32	#define CODESECT AREA \|\|.text\|\|, CODE, READONLY, ALIGN=2
		33	#define LABEL
		34	#elif defined ( __IASMARM__ ) /* IAR */
		35	#define CODESECT SECTION `.text`:CODE
		36	#define PROC
		37	#define LABEL
		38	#define ENDP
		39	#define EXPORT PUBLIC
		40	#elif defined ( __CSMC__ ) /* Cosmic */
		41	#define CODESECT switch .text
		42	#define THUMB
		43	#define EXPORT xdef
		44	#define PROC :
		45	#define LABEL :
		46	#define ENDP
		47	#define arm_bitreversal_32 _arm_bitreversal_32
		48	#elif defined ( __TI_ARM__ ) /* TI ARM */
		49	#define THUMB .thumb
		50	#define CODESECT .text
		51	#define EXPORT .global
		52	#define PROC : .asmfunc
		53	#define LABEL :
		54	#define ENDP .endasmfunc
		55	#define END
		56	#elif defined ( __GNUC__ ) /* GCC */
		57	#define THUMB .thumb
		58	#define CODESECT .section .text
		59	#define EXPORT .global
		60	#define PROC :
		61	#define LABEL :
		62	#define ENDP
		63	#define END
		64
		65	.syntax unified
		66	#endif
		67
		68	CODESECT
		69	THUMB
		70
		71	;/*
		72	; @brief In-place bit reversal function.*
		73	; @param[in, out] pSrc points to the in-place buffer of unknown 32-bit data type.
		74	; @param[in] bitRevLen bit reversal table length*
		75	; @param[in] pBitRevTab points to bit reversal table.
		76	; @return none.*
		77	;/*
		78	EXPORT arm_bitreversal_32
		79	EXPORT arm_bitreversal_16
		80
		81	#if defined ( __CC_ARM ) /* Keil */
		82	#elif defined ( __IASMARM__ ) /* IAR */
		83	#elif defined ( __CSMC__ ) /* Cosmic */
		84	#elif defined ( __TI_ARM__ ) /* TI ARM */
		85	#elif defined ( __GNUC__ ) /* GCC */
		86	.type arm_bitreversal_16, %function
		87	.type arm_bitreversal_32, %function
		88	#endif
		89
		90	#if defined(ARM_MATH_CM0) \|\| defined(ARM_MATH_CM0PLUS) \|\| defined(ARM_MATH_ARMV8MBL)
		91
		92	arm_bitreversal_32 PROC
		93	ADDS r3,r1,#1
		94	PUSH {r4-r6}
		95	ADDS r1,r2,#0
		96	LSRS r3,r3,#1
		97	arm_bitreversal_32_0 LABEL
		98	LDRH r2,[r1,#2]
		99	LDRH r6,[r1,#0]
		100	ADD r2,r0,r2
		101	ADD r6,r0,r6
		102	LDR r5,[r2,#0]
		103	LDR r4,[r6,#0]
		104	STR r5,[r6,#0]
		105	STR r4,[r2,#0]
		106	LDR r5,[r2,#4]
		107	LDR r4,[r6,#4]
		108	STR r5,[r6,#4]
		109	STR r4,[r2,#4]
		110	ADDS r1,r1,#4
		111	SUBS r3,r3,#1
		112	BNE arm_bitreversal_32_0
		113	POP {r4-r6}
		114	BX lr
		115	ENDP
		116
		117	arm_bitreversal_16 PROC
		118	ADDS r3,r1,#1
		119	PUSH {r4-r6}
		120	ADDS r1,r2,#0
		121	LSRS r3,r3,#1
		122	arm_bitreversal_16_0 LABEL
		123	LDRH r2,[r1,#2]
		124	LDRH r6,[r1,#0]
		125	LSRS r2,r2,#1
		126	LSRS r6,r6,#1
		127	ADD r2,r0,r2
		128	ADD r6,r0,r6
		129	LDR r5,[r2,#0]
		130	LDR r4,[r6,#0]
		131	STR r5,[r6,#0]
		132	STR r4,[r2,#0]
		133	ADDS r1,r1,#4
		134	SUBS r3,r3,#1
		135	BNE arm_bitreversal_16_0
		136	POP {r4-r6}
		137	BX lr
		138	ENDP
		139
		140	#else
		141
		142	arm_bitreversal_32 PROC
		143	ADDS r3,r1,#1
		144	CMP r3,#1
		145	IT LS
		146	BXLS lr
		147	PUSH {r4-r9}
		148	ADDS r1,r2,#2
		149	LSRS r3,r3,#2
		150	arm_bitreversal_32_0 LABEL ;/ loop unrolled by 2 /
		151	LDRH r8,[r1,#4]
		152	LDRH r9,[r1,#2]
		153	LDRH r2,[r1,#0]
		154	LDRH r12,[r1,#-2]
		155	ADD r8,r0,r8
		156	ADD r9,r0,r9
		157	ADD r2,r0,r2
		158	ADD r12,r0,r12
		159	LDR r7,[r9,#0]
		160	LDR r6,[r8,#0]
		161	LDR r5,[r2,#0]
		162	LDR r4,[r12,#0]
		163	STR r6,[r9,#0]
		164	STR r7,[r8,#0]
		165	STR r5,[r12,#0]
		166	STR r4,[r2,#0]
		167	LDR r7,[r9,#4]
		168	LDR r6,[r8,#4]
		169	LDR r5,[r2,#4]
		170	LDR r4,[r12,#4]
		171	STR r6,[r9,#4]
		172	STR r7,[r8,#4]
		173	STR r5,[r12,#4]
		174	STR r4,[r2,#4]
		175	ADDS r1,r1,#8
		176	SUBS r3,r3,#1
		177	BNE arm_bitreversal_32_0
		178	POP {r4-r9}
		179	BX lr
		180	ENDP
		181
		182	arm_bitreversal_16 PROC
		183	ADDS r3,r1,#1
		184	CMP r3,#1
		185	IT LS
		186	BXLS lr
		187	PUSH {r4-r9}
		188	ADDS r1,r2,#2
		189	LSRS r3,r3,#2
		190	arm_bitreversal_16_0 LABEL ;/ loop unrolled by 2 /
		191	LDRH r8,[r1,#4]
		192	LDRH r9,[r1,#2]
		193	LDRH r2,[r1,#0]
		194	LDRH r12,[r1,#-2]
		195	ADD r8,r0,r8,LSR #1
		196	ADD r9,r0,r9,LSR #1
		197	ADD r2,r0,r2,LSR #1
		198	ADD r12,r0,r12,LSR #1
		199	LDR r7,[r9,#0]
		200	LDR r6,[r8,#0]
		201	LDR r5,[r2,#0]
		202	LDR r4,[r12,#0]
		203	STR r6,[r9,#0]
		204	STR r7,[r8,#0]
		205	STR r5,[r12,#0]
		206	STR r4,[r2,#0]
		207	ADDS r1,r1,#8
		208	SUBS r3,r3,#1
		209	BNE arm_bitreversal_16_0
		210	POP {r4-r9}
		211	BX lr
		212	ENDP
		213
		214	#endif
		215
		216	END

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