diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.S')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.S | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.S b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.S new file mode 100644 index 0000000..01c1e76 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.S @@ -0,0 +1,216 @@ +;/* ----------------------------------------------------------------------
+; * Project: CMSIS DSP Library
+; * Title: arm_bitreversal2.S
+; * Description: arm_bitreversal_32 function done in assembly for maximum speed.
+; * Called after doing an fft to reorder the output.
+; * The function is loop unrolled by 2. arm_bitreversal_16 as well.
+; *
+; * $Date: 18. March 2019
+; * $Revision: V1.5.2
+; *
+; * Target Processor: Cortex-M cores
+; * -------------------------------------------------------------------- */
+;/*
+; * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
+; *
+; * SPDX-License-Identifier: Apache-2.0
+; *
+; * 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
+; *
+; * 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.
+; */
+
+#if defined ( __CC_ARM ) /* Keil */
+ #define CODESECT AREA ||.text||, CODE, READONLY, ALIGN=2
+ #define LABEL
+#elif defined ( __IASMARM__ ) /* IAR */
+ #define CODESECT SECTION `.text`:CODE
+ #define PROC
+ #define LABEL
+ #define ENDP
+ #define EXPORT PUBLIC
+#elif defined ( __CSMC__ ) /* Cosmic */
+ #define CODESECT switch .text
+ #define THUMB
+ #define EXPORT xdef
+ #define PROC :
+ #define LABEL :
+ #define ENDP
+ #define arm_bitreversal_32 _arm_bitreversal_32
+#elif defined ( __TI_ARM__ ) /* TI ARM */
+ #define THUMB .thumb
+ #define CODESECT .text
+ #define EXPORT .global
+ #define PROC : .asmfunc
+ #define LABEL :
+ #define ENDP .endasmfunc
+ #define END
+#elif defined ( __GNUC__ ) /* GCC */
+ #define THUMB .thumb
+ #define CODESECT .section .text
+ #define EXPORT .global
+ #define PROC :
+ #define LABEL :
+ #define ENDP
+ #define END
+
+ .syntax unified
+#endif
+
+ CODESECT
+ THUMB
+
+;/**
+; @brief In-place bit reversal function.
+; @param[in,out] pSrc points to the in-place buffer of unknown 32-bit data type
+; @param[in] bitRevLen bit reversal table length
+; @param[in] pBitRevTab points to bit reversal table
+; @return none
+; */
+ EXPORT arm_bitreversal_32
+ EXPORT arm_bitreversal_16
+
+#if defined ( __CC_ARM ) /* Keil */
+#elif defined ( __IASMARM__ ) /* IAR */
+#elif defined ( __CSMC__ ) /* Cosmic */
+#elif defined ( __TI_ARM__ ) /* TI ARM */
+#elif defined ( __GNUC__ ) /* GCC */
+ .type arm_bitreversal_16, %function
+ .type arm_bitreversal_32, %function
+#endif
+
+#if defined (ARM_MATH_CM0_FAMILY)
+
+arm_bitreversal_32 PROC
+ ADDS r3,r1,#1
+ PUSH {r4-r6}
+ ADDS r1,r2,#0
+ LSRS r3,r3,#1
+arm_bitreversal_32_0 LABEL
+ LDRH r2,[r1,#2]
+ LDRH r6,[r1,#0]
+ ADD r2,r0,r2
+ ADD r6,r0,r6
+ LDR r5,[r2,#0]
+ LDR r4,[r6,#0]
+ STR r5,[r6,#0]
+ STR r4,[r2,#0]
+ LDR r5,[r2,#4]
+ LDR r4,[r6,#4]
+ STR r5,[r6,#4]
+ STR r4,[r2,#4]
+ ADDS r1,r1,#4
+ SUBS r3,r3,#1
+ BNE arm_bitreversal_32_0
+ POP {r4-r6}
+ BX lr
+ ENDP
+
+arm_bitreversal_16 PROC
+ ADDS r3,r1,#1
+ PUSH {r4-r6}
+ ADDS r1,r2,#0
+ LSRS r3,r3,#1
+arm_bitreversal_16_0 LABEL
+ LDRH r2,[r1,#2]
+ LDRH r6,[r1,#0]
+ LSRS r2,r2,#1
+ LSRS r6,r6,#1
+ ADD r2,r0,r2
+ ADD r6,r0,r6
+ LDR r5,[r2,#0]
+ LDR r4,[r6,#0]
+ STR r5,[r6,#0]
+ STR r4,[r2,#0]
+ ADDS r1,r1,#4
+ SUBS r3,r3,#1
+ BNE arm_bitreversal_16_0
+ POP {r4-r6}
+ BX lr
+ ENDP
+
+#else
+
+arm_bitreversal_32 PROC
+ ADDS r3,r1,#1
+ CMP r3,#1
+ IT LS
+ BXLS lr
+ PUSH {r4-r9}
+ ADDS r1,r2,#2
+ LSRS r3,r3,#2
+arm_bitreversal_32_0 LABEL ;/* loop unrolled by 2 */
+ LDRH r8,[r1,#4]
+ LDRH r9,[r1,#2]
+ LDRH r2,[r1,#0]
+ LDRH r12,[r1,#-2]
+ ADD r8,r0,r8
+ ADD r9,r0,r9
+ ADD r2,r0,r2
+ ADD r12,r0,r12
+ LDR r7,[r9,#0]
+ LDR r6,[r8,#0]
+ LDR r5,[r2,#0]
+ LDR r4,[r12,#0]
+ STR r6,[r9,#0]
+ STR r7,[r8,#0]
+ STR r5,[r12,#0]
+ STR r4,[r2,#0]
+ LDR r7,[r9,#4]
+ LDR r6,[r8,#4]
+ LDR r5,[r2,#4]
+ LDR r4,[r12,#4]
+ STR r6,[r9,#4]
+ STR r7,[r8,#4]
+ STR r5,[r12,#4]
+ STR r4,[r2,#4]
+ ADDS r1,r1,#8
+ SUBS r3,r3,#1
+ BNE arm_bitreversal_32_0
+ POP {r4-r9}
+ BX lr
+ ENDP
+
+arm_bitreversal_16 PROC
+ ADDS r3,r1,#1
+ CMP r3,#1
+ IT LS
+ BXLS lr
+ PUSH {r4-r9}
+ ADDS r1,r2,#2
+ LSRS r3,r3,#2
+arm_bitreversal_16_0 LABEL ;/* loop unrolled by 2 */
+ LDRH r8,[r1,#4]
+ LDRH r9,[r1,#2]
+ LDRH r2,[r1,#0]
+ LDRH r12,[r1,#-2]
+ ADD r8,r0,r8,LSR #1
+ ADD r9,r0,r9,LSR #1
+ ADD r2,r0,r2,LSR #1
+ ADD r12,r0,r12,LSR #1
+ LDR r7,[r9,#0]
+ LDR r6,[r8,#0]
+ LDR r5,[r2,#0]
+ LDR r4,[r12,#0]
+ STR r6,[r9,#0]
+ STR r7,[r8,#0]
+ STR r5,[r12,#0]
+ STR r4,[r2,#0]
+ ADDS r1,r1,#8
+ SUBS r3,r3,#1
+ BNE arm_bitreversal_16_0
+ POP {r4-r9}
+ BX lr
+ ENDP
+
+#endif
+
+ END
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