UBSAN overflow in FFT

An overflow in the fft was observed for certain configurations. The root cause was in the scaling of the fft input data in dct_IV and dst_IV.
The following patch revises the scaling in dct and removes the unused arm implementation.

Bug: 112661057
Bug: 109936783
Bug: 112022208
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc
Change-Id: Idc9c44a9755b8151d5c7d8107696f43ac592413b

2 files changed, 23 insertions, 623 deletions

diff --git a/libFDK/src/arm/dct_arm.cpp b/libFDK/src/arm/dct_arm.cpp
deleted file mode 100644
index dd66109..0000000
--- a/libFDK/src/arm/dct_arm.cpp
+++ /dev/null
@@ -1,572 +0,0 @@
-/* -----------------------------------------------------------------------------
-Software License for The Fraunhofer FDK AAC Codec Library for Android
-
-© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
-Forschung e.V. All rights reserved.
-
- 1.    INTRODUCTION
-The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
-that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
-scheme for digital audio. This FDK AAC Codec software is intended to be used on
-a wide variety of Android devices.
-
-AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
-general perceptual audio codecs. AAC-ELD is considered the best-performing
-full-bandwidth communications codec by independent studies and is widely
-deployed. AAC has been standardized by ISO and IEC as part of the MPEG
-specifications.
-
-Patent licenses for necessary patent claims for the FDK AAC Codec (including
-those of Fraunhofer) may be obtained through Via Licensing
-(www.vialicensing.com) or through the respective patent owners individually for
-the purpose of encoding or decoding bit streams in products that are compliant
-with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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-
-Commercially-licensed AAC software libraries, including floating-point versions
-with enhanced sound quality, are also available from Fraunhofer. Users are
-encouraged to check the Fraunhofer website for additional applications
-information and documentation.
-
-2.    COPYRIGHT LICENSE
-
-Redistribution and use in source and binary forms, with or without modification,
-are permitted without payment of copyright license fees provided that you
-satisfy the following conditions:
-
-You must retain the complete text of this software license in redistributions of
-the FDK AAC Codec or your modifications thereto in source code form.
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-and/or other materials provided with redistributions of the FDK AAC Codec or
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-Fraunhofer Institute for Integrated Circuits IIS
-Attention: Audio and Multimedia Departments - FDK AAC LL
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-
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------------------------------------------------------------------------------ */
-
-/******************* Library for basic calculation routines ********************
-
-   Author(s):
-
-   Description:
-
-*******************************************************************************/
-
-#ifdef FUNCTION_dct_IV_func1
-
-/*
-   Note: This assembler routine is here, because the ARM926 compiler does
-         not encode the inline assembler with optimal speed.
-         With this version, we save 2 cycles per loop iteration.
-*/
-
-__asm void dct_IV_func1(int i, const FIXP_SPK *twiddle,
-                        FIXP_DBL *RESTRICT pDat_0, FIXP_DBL *RESTRICT pDat_1) {
-  /* Register map:
-     r0   i
-     r1   twiddle
-     r2   pDat_0
-     r3   pDat_1
-     r4   accu1
-     r5   accu2
-     r6   accu3
-     r7   accu4
-     r8   val_tw
-     r9   accuX
-  */
-  PUSH{r4 - r9}
-
-  /* 44 cycles for 2 iterations = 22 cycles/iteration */
-  dct_IV_loop1_start
-      /*  First iteration */
-      LDR r8,
-      [r1],
-# 4 // val_tw = *twiddle++;
-      LDR r5,
-      [ r2, #0 ]  // accu2 = pDat_0[0]
-      LDR r4,
-      [ r3, #0 ]  // accu1 = pDat_1[0]
-
-      SMULWT r9,
-      r5,
-      r8  // accuX = accu2*val_tw.l
-          SMULWB r5,
-      r5,
-      r8  // accu2 = accu2*val_tw.h
-          RSB r9,
-      r9,
-# 0 // accuX =-accu2*val_tw.l
-      SMLAWT r5, r4, r8,
-      r5  // accu2 = accu2*val_tw.h + accu1*val_tw.l
-          SMLAWB r4,
-      r4, r8,
-      r9  // accu1 = accu1*val_tw.h - accu2*val_tw.l
-
-          LDR r8,
-      [r1],
-# 4 // val_tw = *twiddle++;
-      LDR r7,
-      [ r3, # - 4 ]  // accu4 = pDat_1[-1]
-      LDR r6,
-      [ r2, #4 ]  // accu3 = pDat_0[1]
-
-      SMULWB r9,
-      r7,
-      r8  // accuX = accu4*val_tw.h
-          SMULWT r7,
-      r7,
-      r8  // accu4 = accu4*val_tw.l
-          RSB r9,
-      r9,
-# 0 // accuX =-accu4*val_tw.h
-      SMLAWB r7, r6, r8,
-      r7  // accu4 = accu4*val_tw.l+accu3*val_tw.h
-          SMLAWT r6,
-      r6, r8,
-      r9  // accu3 = accu3*val_tw.l-accu4*val_tw.h
-
-          STR r5,
-      [r2],
-# 4 // *pDat_0++ = accu2
-      STR r4, [r2],
-# 4 // *pDat_0++ = accu1
-      STR r6, [r3],
-#- 4 // *pDat_1-- = accu3
-      STR r7, [r3],
-#- 4 // *pDat_1-- = accu4
-
-      /*  Second iteration */
-      LDR r8, [r1],
-# 4 // val_tw = *twiddle++;
-      LDR r5,
-      [ r2, #0 ]  // accu2 = pDat_0[0]
-      LDR r4,
-      [ r3, #0 ]  // accu1 = pDat_1[0]
-
-      SMULWT r9,
-      r5,
-      r8  // accuX = accu2*val_tw.l
-          SMULWB r5,
-      r5,
-      r8  // accu2 = accu2*val_tw.h
-          RSB r9,
-      r9,
-# 0 // accuX =-accu2*val_tw.l
-      SMLAWT r5, r4, r8,
-      r5  // accu2 = accu2*val_tw.h + accu1*val_tw.l
-          SMLAWB r4,
-      r4, r8,
-      r9  // accu1 = accu1*val_tw.h - accu2*val_tw.l
-
-          LDR r8,
-      [r1],
-# 4 // val_tw = *twiddle++;
-      LDR r7,
-      [ r3, # - 4 ]  // accu4 = pDat_1[-1]
-      LDR r6,
-      [ r2, #4 ]  // accu3 = pDat_0[1]
-
-      SMULWB r9,
-      r7,
-      r8  // accuX = accu4*val_tw.h
-          SMULWT r7,
-      r7,
-      r8  // accu4 = accu4*val_tw.l
-          RSB r9,
-      r9,
-# 0 // accuX =-accu4*val_tw.h
-      SMLAWB r7, r6, r8,
-      r7  // accu4 = accu4*val_tw.l+accu3*val_tw.h
-          SMLAWT r6,
-      r6, r8,
-      r9  // accu3 = accu3*val_tw.l-accu4*val_tw.h
-
-          STR r5,
-      [r2],
-# 4 // *pDat_0++ = accu2
-      STR r4, [r2],
-# 4 // *pDat_0++ = accu1
-      STR r6, [r3],
-#- 4 // *pDat_1-- = accu3
-      STR r7, [r3],
-#- 4 // *pDat_1-- = accu4
-
-      SUBS r0, r0,
-# 1 BNE dct_IV_loop1_start
-
-      POP { r4 - r9 }
-
-  BX lr
-}
-
-#endif /* FUNCTION_dct_IV_func1 */
-
-#ifdef FUNCTION_dct_IV_func2
-
-/* __attribute__((noinline)) */
-static inline void dct_IV_func2(int i, const FIXP_SPK *twiddle,
-                                FIXP_DBL *pDat_0, FIXP_DBL *pDat_1, int inc) {
-  FIXP_DBL accu1, accu2, accu3, accu4, accuX;
-  LONG val_tw;
-
-  accu1 = pDat_1[-2];
-  accu2 = pDat_1[-1];
-
-  *--pDat_1 = -(pDat_0[1] >> 1);
-  *pDat_0++ = (pDat_0[0] >> 1);
-
-  twiddle += inc;
-
-  __asm {
-    LDR     val_tw, [twiddle], inc, LSL #2  // val_tw = *twiddle; twiddle += inc
-    B       dct_IV_loop2_2nd_part
-
-        /* 42 cycles for 2 iterations = 21 cycles/iteration */
-dct_IV_loop2:
-    SMULWT  accuX, accu2, val_tw
-    SMULWB  accu2, accu2, val_tw
-    RSB     accuX, accuX, #0
-    SMLAWB  accuX, accu1, val_tw, accuX
-    SMLAWT  accu2, accu1, val_tw, accu2
-    STR     accuX, [pDat_0], #4
-    STR     accu2, [pDat_1, #-4] !
-
-    LDR     accu4, [pDat_0, #4]
-    LDR     accu3, [pDat_0]
-    SMULWB  accuX, accu4, val_tw
-    SMULWT  accu4, accu4, val_tw
-    RSB     accuX, accuX, #0
-    SMLAWT  accuX, accu3, val_tw, accuX
-    SMLAWB  accu4, accu3, val_tw, accu4
-
-    LDR     accu1, [pDat_1, #-8]
-    LDR     accu2, [pDat_1, #-4]
-
-    LDR     val_tw, [twiddle], inc, LSL #2  // val_tw = *twiddle; twiddle += inc
-
-    STR     accuX, [pDat_1, #-4] !
-    STR     accu4, [pDat_0], #4
-
-dct_IV_loop2_2nd_part:
-    SMULWT  accuX, accu2, val_tw
-    SMULWB  accu2, accu2, val_tw
-    RSB     accuX, accuX, #0
-    SMLAWB  accuX, accu1, val_tw, accuX
-    SMLAWT  accu2, accu1, val_tw, accu2
-    STR     accuX, [pDat_0], #4
-    STR     accu2, [pDat_1, #-4] !
-
-    LDR     accu4, [pDat_0, #4]
-    LDR     accu3, [pDat_0]
-    SMULWB  accuX, accu4, val_tw
-    SMULWT  accu4, accu4, val_tw
-    RSB     accuX, accuX, #0
-    SMLAWT  accuX, accu3, val_tw, accuX
-    SMLAWB  accu4, accu3, val_tw, accu4
-
-    LDR     accu1, [pDat_1, #-8]
-    LDR     accu2, [pDat_1, #-4]
-
-    STR     accuX, [pDat_1, #-4] !
-    STR     accu4, [pDat_0], #4
-
-    LDR     val_tw, [twiddle], inc, LSL #2  // val_tw = *twiddle; twiddle += inc
-
-    SUBS    i, i, #1
-    BNE     dct_IV_loop2
-  }
-
-  /* Last Sin and Cos value pair are the same */
-  accu1 = fMultDiv2(accu1, WTC(0x5a82799a));
-  accu2 = fMultDiv2(accu2, WTC(0x5a82799a));
-
-  *--pDat_1 = accu1 + accu2;
-  *pDat_0++ = accu1 - accu2;
-}
-#endif /* FUNCTION_dct_IV_func2 */
-
-#ifdef FUNCTION_dst_IV_func1
-
-__asm void dst_IV_func1(int i, const FIXP_SPK *twiddle, FIXP_DBL *pDat_0,
-                        FIXP_DBL *pDat_1) {
-  /* Register map:
-     r0   i
-     r1   twiddle
-     r2   pDat_0
-     r3   pDat_1
-     r4   accu1
-     r5   accu2
-     r6   accu3
-     r7   accu4
-     r8   val_tw
-     r9   accuX
-  */
-  PUSH{r4 - r9}
-
-  dst_IV_loop1 LDR r8,
-      [r1],
-# 4 // val_tw = *twiddle++
-      LDR r5,
-      [r2]  // accu2 = pDat_0[0]
-      LDR r6,
-      [ r2, #4 ]  // accu3 = pDat_0[1]
-      RSB r5,
-      r5,
-# 0 // accu2 = -accu2
-      SMULWT r9, r5,
-      r8  // accuX = (-accu2)*val_tw.l
-          LDR r4,
-      [ r3, # - 4 ]  // accu1 = pDat_1[-1]
-      RSB r9,
-      r9,
-# 0 // accuX = -(-accu2)*val_tw.l
-      SMLAWB r9, r4, r8,
-      r9  // accuX = accu1*val_tw.h-(-accu2)*val_tw.l
-          SMULWT r4,
-      r4,
-      r8  // accu1 = accu1*val_tw.l
-          LDR r7,
-      [ r3, # - 8 ]  // accu4 = pDat_1[-2]
-      SMLAWB r5,
-      r5, r8,
-      r4  // accu2 = (-accu2)*val_tw.t+accu1*val_tw.l
-          LDR r8,
-      [r1],
-# 4 // val_tw = *twiddle++
-      STR r5, [r2],
-# 4 // *pDat_0++ = accu2
-      STR r9, [r2],
-# 4 // *pDat_0++ = accu1 (accuX)
-      RSB r7, r7,
-# 0 // accu4 = -accu4
-      SMULWB r5, r7,
-      r8  // accu2 = (-accu4)*val_tw.h
-          SMULWB r4,
-      r6,
-      r8  // accu1 = (-accu4)*val_tw.l
-          RSB r5,
-      r5,
-# 0 // accu2 = -(-accu4)*val_tw.h
-      SMLAWT r6, r6, r8,
-      r5  // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
-          SMLAWT r7,
-      r7, r8,
-      r4  // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
-          STR r6,
-      [ r3, # - 4 ] !  // *--pDat_1 = accu3
-      STR r7,
-      [ r3, # - 4 ] !  // *--pDat_1 = accu4
-
-      LDR r8,
-      [r1],
-# 4 // val_tw = *twiddle++
-      LDR r5,
-      [r2]  // accu2 = pDat_0[0]
-      LDR r6,
-      [ r2, #4 ]  // accu3 = pDat_0[1]
-      RSB r5,
-      r5,
-# 0 // accu2 = -accu2
-      SMULWT r9, r5,
-      r8  // accuX = (-accu2)*val_tw.l
-          LDR r4,
-      [ r3, # - 4 ]  // accu1 = pDat_1[-1]
-      RSB r9,
-      r9,
-# 0 // accuX = -(-accu2)*val_tw.l
-      SMLAWB r9, r4, r8,
-      r9  // accuX = accu1*val_tw.h-(-accu2)*val_tw.l
-          SMULWT r4,
-      r4,
-      r8  // accu1 = accu1*val_tw.l
-          LDR r7,
-      [ r3, # - 8 ]  // accu4 = pDat_1[-2]
-      SMLAWB r5,
-      r5, r8,
-      r4  // accu2 = (-accu2)*val_tw.t+accu1*val_tw.l
-          LDR r8,
-      [r1],
-# 4 // val_tw = *twiddle++
-      STR r5, [r2],
-# 4 // *pDat_0++ = accu2
-      STR r9, [r2],
-# 4 // *pDat_0++ = accu1 (accuX)
-      RSB r7, r7,
-# 0 // accu4 = -accu4
-      SMULWB r5, r7,
-      r8  // accu2 = (-accu4)*val_tw.h
-          SMULWB r4,
-      r6,
-      r8  // accu1 = (-accu4)*val_tw.l
-          RSB r5,
-      r5,
-# 0 // accu2 = -(-accu4)*val_tw.h
-      SMLAWT r6, r6, r8,
-      r5  // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
-          SMLAWT r7,
-      r7, r8,
-      r4  // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
-          STR r6,
-      [ r3, # - 4 ] !  // *--pDat_1 = accu3
-      STR r7,
-      [ r3, # - 4 ] !  // *--pDat_1 = accu4
-
-      SUBS r0,
-      r0,
-# 4 // i-= 4
-      BNE dst_IV_loop1
-
-          POP{r4 - r9} BX lr
-}
-#endif /* FUNCTION_dst_IV_func1 */
-
-#ifdef FUNCTION_dst_IV_func2
-
-/* __attribute__((noinline)) */
-static inline void dst_IV_func2(int i, const FIXP_SPK *twiddle,
-                                FIXP_DBL *RESTRICT pDat_0,
-                                FIXP_DBL *RESTRICT pDat_1, int inc) {
-  FIXP_DBL accu1, accu2, accu3, accu4;
-  LONG val_tw;
-
-  accu4 = pDat_0[0];
-  accu3 = pDat_0[1];
-  accu4 >>= 1;
-  accu3 >>= 1;
-  accu4 = -accu4;
-
-  accu1 = pDat_1[-1];
-  accu2 = pDat_1[0];
-
-  *pDat_0++ = accu3;
-  *pDat_1-- = accu4;
-
-  __asm {
-    B       dst_IV_loop2_2nd_part
-
-        /* 50 cycles for 2 iterations = 25 cycles/iteration */
-
-dst_IV_loop2:
-
-    LDR     val_tw, [twiddle], inc, LSL #2  // val_tw = *twiddle; twiddle += inc
-
-    RSB     accu2, accu2, #0  // accu2 = -accu2
-    RSB     accu1, accu1, #0  // accu1 = -accu1
-    SMULWT  accu3, accu2, val_tw  // accu3 = (-accu2)*val_tw.l
-    SMULWT  accu4, accu1, val_tw  // accu4 = (-accu1)*val_tw.l
-    RSB     accu3, accu3, #0  // accu3 = -accu2*val_tw.l
-    SMLAWB  accu1, accu1, val_tw, accu3  // accu1 = -accu1*val_tw.h-(-accu2)*val_tw.l
-    SMLAWB  accu2, accu2, val_tw, accu4  // accu2 = (-accu1)*val_tw.l+(-accu2)*val_tw.h
-    STR     accu1, [pDat_1], #-4  // *pDat_1-- = accu1
-    STR     accu2, [pDat_0], #4  // *pDat_0++ = accu2
-
-    LDR     accu4, [pDat_0]  // accu4 = pDat_0[0]
-    LDR     accu3, [pDat_0, #4]  // accu3 = pDat_0[1]
-
-    RSB     accu4, accu4, #0  // accu4 = -accu4
-    RSB     accu3, accu3, #0  // accu3 = -accu3
-
-    SMULWB  accu1, accu3, val_tw  // accu1 = (-accu3)*val_tw.h
-    SMULWT  accu2, accu3, val_tw  // accu2 = (-accu3)*val_tw.l
-    RSB     accu1, accu1, #0  // accu1 = -(-accu3)*val_tw.h
-    SMLAWT  accu3, accu4, val_tw, accu1  // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
-    SMLAWB  accu4, accu4, val_tw, accu2  // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
-
-    LDR     accu1, [pDat_1, #-4]  // accu1 = pDat_1[-1]
-    LDR     accu2, [pDat_1]  // accu2 = pDat_1[0]
-
-    STR     accu3, [pDat_0], #4  // *pDat_0++ = accu3
-    STR     accu4, [pDat_1], #-4  // *pDat_1-- = accu4
-
-dst_IV_loop2_2nd_part:
-
-    LDR     val_tw, [twiddle], inc, LSL #2  // val_tw = *twiddle; twiddle += inc
-
-    RSB     accu2, accu2, #0  // accu2 = -accu2
-    RSB     accu1, accu1, #0  // accu1 = -accu1
-    SMULWT  accu3, accu2, val_tw  // accu3 = (-accu2)*val_tw.l
-    SMULWT  accu4, accu1, val_tw  // accu4 = (-accu1)*val_tw.l
-    RSB     accu3, accu3, #0  // accu3 = -accu2*val_tw.l
-    SMLAWB  accu1, accu1, val_tw, accu3  // accu1 = -accu1*val_tw.h-(-accu2)*val_tw.l
-    SMLAWB  accu2, accu2, val_tw, accu4  // accu2 = (-accu1)*val_tw.l+(-accu2)*val_tw.h
-    STR     accu1, [pDat_1], #-4  // *pDat_1-- = accu1
-    STR     accu2, [pDat_0], #4  // *pDat_0++ = accu2
-
-    LDR     accu4, [pDat_0]  // accu4 = pDat_0[0]
-    LDR     accu3, [pDat_0, #4]  // accu3 = pDat_0[1]
-
-    RSB     accu4, accu4, #0  // accu4 = -accu4
-    RSB     accu3, accu3, #0  // accu3 = -accu3
-
-    SMULWB  accu1, accu3, val_tw  // accu1 = (-accu3)*val_tw.h
-    SMULWT  accu2, accu3, val_tw  // accu2 = (-accu3)*val_tw.l
-    RSB     accu1, accu1, #0  // accu1 = -(-accu3)*val_tw.h
-    SMLAWT  accu3, accu4, val_tw, accu1  // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
-    SMLAWB  accu4, accu4, val_tw, accu2  // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
-
-    LDR     accu1, [pDat_1, #-4]  // accu1 = pDat_1[-1]
-    LDR     accu2, [pDat_1]  // accu2 = pDat_1[0]
-
-    STR     accu3, [pDat_0], #4  // *pDat_0++ = accu3
-    STR     accu4, [pDat_1], #-4  // *pDat_1-- = accu4
-
-    SUBS    i, i, #1
-    BNE     dst_IV_loop2
-  }
-
-  /* Last Sin and Cos value pair are the same */
-  accu1 = fMultDiv2(-accu1, WTC(0x5a82799a));
-  accu2 = fMultDiv2(-accu2, WTC(0x5a82799a));
-
-  *pDat_0 = accu1 + accu2;
-  *pDat_1 = accu1 - accu2;
-}
-#endif /* FUNCTION_dst_IV_func2 */
diff --git a/libFDK/src/dct.cpp b/libFDK/src/dct.cpp
index a451331..776493e 100644
--- a/libFDK/src/dct.cpp
+++ b/libFDK/src/dct.cpp
@@ -124,10 +124,6 @@ amm-info@iis.fraunhofer.de
 #include "FDK_tools_rom.h"
 #include "fft.h"
 
-#if defined(__arm__)
-#include "arm/dct_arm.cpp"
-#endif
-
 void dct_getTables(const FIXP_WTP **ptwiddle, const FIXP_STP **sin_twiddle,
                    int *sin_step, int length) {
   const FIXP_WTP *twiddle;
@@ -387,12 +383,6 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
 
   dct_getTables(&twiddle, &sin_twiddle, &sin_step, L);
 
-#ifdef FUNCTION_dct_IV_func1
-  if (M >= 4 && (M & 3) == 0) {
-    /* ARM926: 44 cycles for 2 iterations = 22 cycles/iteration */
-    dct_IV_func1(M >> 2, twiddle, &pDat[0], &pDat[L - 1]);
-  } else
-#endif /* FUNCTION_dct_IV_func1 */
   {
     FIXP_DBL *RESTRICT pDat_0 = &pDat[0];
     FIXP_DBL *RESTRICT pDat_1 = &pDat[L - 2];
@@ -410,10 +400,10 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
       cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
       cplxMultDiv2(&accu3, &accu4, accu4, accu3, twiddle[i + 1]);
 
-      pDat_0[0] = accu2;
-      pDat_0[1] = accu1;
-      pDat_1[0] = accu4;
-      pDat_1[1] = -accu3;
+      pDat_0[0] = accu2 >> 1;
+      pDat_0[1] = accu1 >> 1;
+      pDat_1[0] = accu4 >> 1;
+      pDat_1[1] = -(accu3 >> 1);
     }
     if (M & 1) {
       FIXP_DBL accu1, accu2;
@@ -423,19 +413,13 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
 
       cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
 
-      pDat_0[0] = accu2;
-      pDat_0[1] = accu1;
+      pDat_0[0] = accu2 >> 1;
+      pDat_0[1] = accu1 >> 1;
     }
   }
 
   fft(M, pDat, pDat_e);
 
-#ifdef FUNCTION_dct_IV_func2
-  if (M >= 4 && (M & 3) == 0) {
-    /* ARM926: 42 cycles for 2 iterations = 21 cycles/iteration */
-    dct_IV_func2(M >> 2, sin_twiddle, &pDat[0], &pDat[L], sin_step);
-  } else
-#endif /* FUNCTION_dct_IV_func2 */
   {
     FIXP_DBL *RESTRICT pDat_0 = &pDat[0];
     FIXP_DBL *RESTRICT pDat_1 = &pDat[L - 2];
@@ -446,20 +430,19 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
     accu1 = pDat_1[0];
     accu2 = pDat_1[1];
 
-    pDat_1[1] = -(pDat_0[1] >> 1);
-    pDat_0[0] = (pDat_0[0] >> 1);
+    pDat_1[1] = -pDat_0[1];
 
     /* 28 cycles for ARM926 */
     for (idx = sin_step, i = 1; i<(M + 1)>> 1; i++, idx += sin_step) {
       FIXP_STP twd = sin_twiddle[idx];
-      cplxMultDiv2(&accu3, &accu4, accu1, accu2, twd);
+      cplxMult(&accu3, &accu4, accu1, accu2, twd);
       pDat_0[1] = accu3;
       pDat_1[0] = accu4;
 
       pDat_0 += 2;
       pDat_1 -= 2;
 
-      cplxMultDiv2(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
+      cplxMult(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
 
       accu1 = pDat_1[0];
       accu2 = pDat_1[1];
@@ -470,8 +453,8 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
 
     if ((M & 1) == 0) {
       /* Last Sin and Cos value pair are the same */
-      accu1 = fMultDiv2(accu1, WTC(0x5a82799a));
-      accu2 = fMultDiv2(accu2, WTC(0x5a82799a));
+      accu1 = fMult(accu1, WTC(0x5a82799a));
+      accu2 = fMult(accu2, WTC(0x5a82799a));
 
       pDat_1[0] = accu1 + accu2;
       pDat_0[1] = accu1 - accu2;
@@ -497,11 +480,6 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
 
   dct_getTables(&twiddle, &sin_twiddle, &sin_step, L);
 
-#ifdef FUNCTION_dst_IV_func1
-  if ((M >= 4) && ((M & 3) == 0)) {
-    dst_IV_func1(M, twiddle, &pDat[0], &pDat[L]);
-  } else
-#endif
   {
     FIXP_DBL *RESTRICT pDat_0 = &pDat[0];
     FIXP_DBL *RESTRICT pDat_1 = &pDat[L - 2];
@@ -519,10 +497,10 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
       cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
       cplxMultDiv2(&accu3, &accu4, accu4, accu3, twiddle[i + 1]);
 
-      pDat_0[0] = accu2;
-      pDat_0[1] = accu1;
-      pDat_1[0] = accu4;
-      pDat_1[1] = -accu3;
+      pDat_0[0] = accu2 >> 1;
+      pDat_0[1] = accu1 >> 1;
+      pDat_1[0] = accu4 >> 1;
+      pDat_1[1] = -(accu3 >> 1);
     }
     if (M & 1) {
       FIXP_DBL accu1, accu2;
@@ -532,19 +510,13 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
 
       cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
 
-      pDat_0[0] = accu2;
-      pDat_0[1] = accu1;
+      pDat_0[0] = accu2 >> 1;
+      pDat_0[1] = accu1 >> 1;
     }
   }
 
   fft(M, pDat, pDat_e);
 
-#ifdef FUNCTION_dst_IV_func2
-  if ((M >= 4) && ((M & 3) == 0)) {
-    dst_IV_func2(M >> 2, sin_twiddle + sin_step, &pDat[0], &pDat[L - 1],
-                 sin_step);
-  } else
-#endif /* FUNCTION_dst_IV_func2 */
   {
     FIXP_DBL *RESTRICT pDat_0;
     FIXP_DBL *RESTRICT pDat_1;
@@ -558,20 +530,20 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
     accu1 = pDat_1[0];
     accu2 = pDat_1[1];
 
-    pDat_1[1] = -(pDat_0[0] >> 1);
-    pDat_0[0] = (pDat_0[1] >> 1);
+    pDat_1[1] = -pDat_0[0];
+    pDat_0[0] = pDat_0[1];
 
     for (idx = sin_step, i = 1; i<(M + 1)>> 1; i++, idx += sin_step) {
       FIXP_STP twd = sin_twiddle[idx];
 
-      cplxMultDiv2(&accu3, &accu4, accu1, accu2, twd);
+      cplxMult(&accu3, &accu4, accu1, accu2, twd);
       pDat_1[0] = -accu3;
       pDat_0[1] = -accu4;
 
       pDat_0 += 2;
       pDat_1 -= 2;
 
-      cplxMultDiv2(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
+      cplxMult(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
 
       accu1 = pDat_1[0];
       accu2 = pDat_1[1];
@@ -582,8 +554,8 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
 
     if ((M & 1) == 0) {
       /* Last Sin and Cos value pair are the same */
-      accu1 = fMultDiv2(accu1, WTC(0x5a82799a));
-      accu2 = fMultDiv2(accu2, WTC(0x5a82799a));
+      accu1 = fMult(accu1, WTC(0x5a82799a));
+      accu2 = fMult(accu2, WTC(0x5a82799a));
 
       pDat_0[1] = -accu1 - accu2;
       pDat_1[0] = accu2 - accu1;