Viswanath Puttagunta
2014-Dec-07 08:17 UTC
[opus] [RFC PATCH v2] cover: armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics
Hi, Optimizes celt_pitch_xcorr for floating point. Changes from RFCv1: - Rebased on top of commit aad281878: Fix celt_pitch_xcorr_c signature. which got rid of ugly code around CELT_PITCH_XCORR_IMPL passing of "arch" parameter. - Unified with --enable-intrinsics used by x86 - Modified algorithm to be more in-line with algorithm in celt_pitch_xcorr_arm.s Viswanath Puttagunta (1): armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics Makefile.am | 11 ++ celt/arm/arm_celt_map.c | 15 ++- celt/arm/celt_neon_intr.c | 242 +++++++++++++++++++++++++++++++++++++++ celt/arm/pitch_arm.h | 13 ++- celt/cpu_support.h | 3 +- celt/pitch.h | 6 +- celt/tests/test_unit_mathops.c | 10 +- celt/tests/test_unit_rotation.c | 9 +- celt_sources.mk | 3 + configure.ac | 77 +++++++++++-- 10 files changed, 370 insertions(+), 19 deletions(-) create mode 100644 celt/arm/celt_neon_intr.c -- 1.7.9.5
Viswanath Puttagunta
2014-Dec-07 08:17 UTC
[opus] [RFC PATCH v2] armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics
Optimize celt_pitch_xcorr function (for floating point)
using ARM NEON intrinsics for SoCs that have NEON VFP unit.
To enable this optimization, use --enable-intrinsics
configure option.
Compile time and runtime checks are also supported to make sure
this optimization is only enabled when the compiler supports
neon intrinsics.
---
Makefile.am | 11 ++
celt/arm/arm_celt_map.c | 15 ++-
celt/arm/celt_neon_intr.c | 242 +++++++++++++++++++++++++++++++++++++++
celt/arm/pitch_arm.h | 13 ++-
celt/cpu_support.h | 3 +-
celt/pitch.h | 6 +-
celt/tests/test_unit_mathops.c | 10 +-
celt/tests/test_unit_rotation.c | 9 +-
celt_sources.mk | 3 +
configure.ac | 77 +++++++++++--
10 files changed, 370 insertions(+), 19 deletions(-)
create mode 100644 celt/arm/celt_neon_intr.c
diff --git a/Makefile.am b/Makefile.am
index e20f7b4..0687814 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -41,6 +41,11 @@ endif
if CPU_ARM
CELT_SOURCES += $(CELT_SOURCES_ARM)
SILK_SOURCES += $(SILK_SOURCES_ARM)
+
+if OPUS_ARM_NEON_INTR
+CELT_SOURCES += $(CELT_SOURCES_ARM_NEON_INTR)
+endif
+
if OPUS_ARM_EXTERNAL_ASM
nodist_libopus_la_SOURCES = $(CELT_SOURCES_ARM_ASM:.s=-gnu.S)
BUILT_SOURCES = $(CELT_SOURCES_ARM_ASM:.s=-gnu.S) \
@@ -260,3 +265,9 @@ if HAVE_SSE2
$(SSE_OBJ): CFLAGS += -msse2
endif
endif
+
+if OPUS_ARM_NEON_INTR
+CELT_ARM_NEON_INTR_OBJ = $(CELT_SOURCES_ARM_NEON_INTR:.c=.lo) \
+ %test_unit_rotation.o %test_unit_mathops.o
+$(CELT_ARM_NEON_INTR_OBJ): CFLAGS += $(OPUS_ARM_NEON_INTR_CPPFLAGS)
+endif
diff --git a/celt/arm/arm_celt_map.c b/celt/arm/arm_celt_map.c
index 547a84d..ecdf7ec 100644
--- a/celt/arm/arm_celt_map.c
+++ b/celt/arm/arm_celt_map.c
@@ -41,9 +41,18 @@ opus_val32 (*const
CELT_PITCH_XCORR_IMPL[OPUS_ARCHMASK+1])(const opus_val16 *,
MAY_HAVE_MEDIA(celt_pitch_xcorr), /* Media */
MAY_HAVE_NEON(celt_pitch_xcorr) /* NEON */
};
-# else
-# error "Floating-point implementation is not supported by ARM asm
yet." \
- "Reconfigure with --disable-rtcd or send patches."
+# else /* !FIXED_POINT */
+void (*const CELT_PITCH_XCORR_IMPL[OPUS_ARCHMASK+1])(const opus_val16 *,
+ const opus_val16 *, opus_val32 *, int, int) = {
+ celt_pitch_xcorr_c, /* ARMv4 */
+ celt_pitch_xcorr_c, /* EDSP */
+ celt_pitch_xcorr_c, /* Media */
+#if defined(OPUS_ARM_NEON_INTR)
+ celt_pitch_xcorr_float_neon /* Neon */
+#else
+ celt_pitch_xcorr_c /* Neon */
+#endif
+};
# endif
#endif
diff --git a/celt/arm/celt_neon_intr.c b/celt/arm/celt_neon_intr.c
new file mode 100644
index 0000000..af71498
--- /dev/null
+++ b/celt/arm/celt_neon_intr.c
@@ -0,0 +1,242 @@
+/* Copyright (c) 2014-2015 Xiph.Org Foundation
+ Written by Viswanath Puttagunta */
+/**
+ @file celt_neon_intr.c
+ @brief ARM Neon Intrinsic optimizations for celt
+ */
+
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#include <arm_neon.h>
+#include "../arch.h"
+
+/*
+ * Function: xcorr_kernel_neon_float
+ * ---------------------------------
+ * Computes 4 correlation values and stores them in sum[4]
+ */
+void xcorr_kernel_neon_float(const float *x, const float *y,
+ float sum[4], int len) {
+ float32x4_t YY[3];
+ float32x4_t YEXT[3];
+ float32x4_t XX[2];
+ float32x2_t XX_2;
+ float32x4_t SUMM;
+ float *xi = x;
+ float *yi = y;
+
+ celt_assert(len>0);
+
+ YY[0] = vld1q_f32(yi);
+ SUMM = vdupq_n_f32(0);
+
+ /* Consume 8 elements in x vector and 12 elements in y
+ * vector. However, the 12'th element never really gets
+ * touched in this loop. So, if len == 8, then we only
+ * must access y[0] to y[10]. y[11] must not be accessed
+ * hence make sure len > 8 and not len >= 8
+ */
+ while (len > 8) {
+ yi += 4;
+ YY[1] = vld1q_f32(yi);
+ yi += 4;
+ YY[2] = vld1q_f32(yi);
+
+ XX[0] = vld1q_f32(xi);
+ xi += 4;
+ XX[1] = vld1q_f32(xi);
+ xi += 4;
+
+ SUMM = vmlaq_lane_f32(SUMM, YY[0], vget_low_f32(XX[0]), 0);
+ YEXT[0] = vextq_f32(YY[0], YY[1], 1);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[0], vget_low_f32(XX[0]), 1);
+ YEXT[1] = vextq_f32(YY[0], YY[1], 2);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[1], vget_high_f32(XX[0]), 0);
+ YEXT[2] = vextq_f32(YY[0], YY[1], 3);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[2], vget_high_f32(XX[0]), 1);
+
+ SUMM = vmlaq_lane_f32(SUMM, YY[1], vget_low_f32(XX[1]), 0);
+ YEXT[0] = vextq_f32(YY[1], YY[2], 1);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[0], vget_low_f32(XX[1]), 1);
+ YEXT[1] = vextq_f32(YY[1], YY[2], 2);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[1], vget_high_f32(XX[1]), 0);
+ YEXT[2] = vextq_f32(YY[1], YY[2], 3);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[2], vget_high_f32(XX[1]), 1);
+
+ YY[0] = YY[2];
+ len -= 8;
+ }
+
+ /* Consume 4 elements in x vector and 8 elements in y
+ * vector. However, the 8'th element in y never really gets
+ * touched in this loop. So, if len == 4, then we only
+ * must access y[0] to y[6]. y[7] must not be accessed
+ * hence make sure len>4 and not len>=4
+ */
+ while (len > 4) {
+ yi += 4;
+ YY[1] = vld1q_f32(yi);
+
+ XX[0] = vld1q_f32(xi);
+ xi += 4;
+
+ SUMM = vmlaq_lane_f32(SUMM, YY[0], vget_low_f32(XX[0]), 0);
+ YEXT[0] = vextq_f32(YY[0], YY[1], 1);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[0], vget_low_f32(XX[0]), 1);
+ YEXT[1] = vextq_f32(YY[0], YY[1], 2);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[1], vget_high_f32(XX[0]), 0);
+ YEXT[2] = vextq_f32(YY[0], YY[1], 3);
+ SUMM = vmlaq_lane_f32(SUMM, YEXT[2], vget_high_f32(XX[0]), 1);
+
+ YY[0] = YY[1];
+ len -= 4;
+ }
+
+ /* Just unroll the rest of the loop */
+ yi++;
+ switch(len) {
+ case 4:
+ XX_2 = vld1_dup_f32(xi++);
+ SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0);
+ YY[0] = vld1q_f32(yi++);
+ case 3:
+ XX_2 = vld1_dup_f32(xi++);
+ SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0);
+ YY[0] = vld1q_f32(yi++);
+ case 2:
+ XX_2 = vld1_dup_f32(xi++);
+ SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0);
+ YY[0] = vld1q_f32(yi++);
+ case 1:
+ XX_2 = vld1_dup_f32(xi++);
+ SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0);
+ }
+
+ vst1q_f32(sum, SUMM);
+}
+
+/*
+ * Function: xcorr3to1_kernel_neon_float
+ * ---------------------------------
+ * Computes single correlation values and stores in *sum
+ */
+void xcorr3to1_kernel_neon_float(const float *x, const float *y,
+ float *sum, int len) {
+ int i;
+ float32x4_t XX[4];
+ float32x4_t YY[4];
+ float32x4_t SUMM;
+ float32x2_t ZERO;
+ float32x2x2_t tv;
+ float sumi;
+ float *xi = x;
+ float *yi = y;
+
+ ZERO = vdup_n_f32(0);
+ SUMM = vdupq_n_f32(0);
+
+ /* Work on 16 values per cycle */
+ while (len >= 16) {
+ XX[0] = vld1q_f32(xi);
+ xi += 4;
+ XX[1] = vld1q_f32(xi);
+ xi += 4;
+ XX[2] = vld1q_f32(xi);
+ xi += 4;
+ XX[3] = vld1q_f32(xi);
+ xi += 4;
+
+ YY[0] = vld1q_f32(yi);
+ yi += 4;
+ YY[1] = vld1q_f32(yi);
+ yi += 4;
+ YY[2] = vld1q_f32(yi);
+ yi += 4;
+ YY[3] = vld1q_f32(yi);
+ yi += 4;
+
+ SUMM = vmlaq_f32(SUMM, YY[0], XX[0]);
+ SUMM = vmlaq_f32(SUMM, YY[1], XX[1]);
+ SUMM = vmlaq_f32(SUMM, YY[2], XX[2]);
+ SUMM = vmlaq_f32(SUMM, YY[3], XX[3]);
+ len -= 16;
+ }
+
+ /* Work on 8 values per cycle */
+ while (len >= 8) {
+ XX[0] = vld1q_f32(xi);
+ xi += 4;
+ XX[1] = vld1q_f32(xi);
+ xi += 4;
+
+ YY[0] = vld1q_f32(yi);
+ yi += 4;
+ YY[1] = vld1q_f32(yi);
+ yi += 4;
+
+ SUMM = vmlaq_f32(SUMM, YY[0], XX[0]);
+ SUMM = vmlaq_f32(SUMM, YY[1], XX[1]);
+ len -= 8;
+ }
+
+ /* Work on 4 values per cycle */
+ while (len >= 4) {
+ XX[0] = vld1q_f32(xi);
+ xi += 4;
+ YY[0] = vld1q_f32(yi);
+ yi += 4;
+ SUMM = vmlaq_f32(SUMM, YY[0], XX[0]);
+ len -= 4;
+ }
+ /* Accumulate results into single float */
+ tv.val[0] = vadd_f32(vget_low_f32(SUMM), vget_high_f32(SUMM));
+ tv = vtrn_f32(tv.val[0], ZERO);
+ tv.val[0] = vadd_f32(tv.val[0], tv.val[1]);
+
+ vst1_lane_f32(&sumi, tv.val[0], 0);
+ for (i = 0; i < len; i++)
+ sumi += xi[i] * yi[i];
+ *sum = sumi;
+}
+
+void celt_pitch_xcorr_float_neon(const opus_val16 *_x, const opus_val16 *_y,
+ opus_val32 *xcorr, int len, int max_pitch) {
+ int i;
+ celt_assert(max_pitch > 0);
+ celt_assert((((unsigned char *)_x-(unsigned char *)NULL)&3)==0);
+
+ for (i = 0; i < (max_pitch-3); i += 4) {
+ xcorr_kernel_neon_float((float *)_x, (float *)_y+i,
+ (float *)xcorr+i, len);
+ }
+
+ /* In case max_pitch isn't multiple of 4
+ * compute single correlation value per cycle
+ */
+ for (; i < max_pitch; i++) {
+ xcorr3to1_kernel_neon_float((float *)_x, (float *)_y+i,
+ (float *)xcorr+i, len);
+ }
+}
diff --git a/celt/arm/pitch_arm.h b/celt/arm/pitch_arm.h
index a07f8ac..125d1bc 100644
--- a/celt/arm/pitch_arm.h
+++ b/celt/arm/pitch_arm.h
@@ -52,6 +52,17 @@ opus_val32 celt_pitch_xcorr_edsp(const opus_val16 *_x, const
opus_val16 *_y,
((void)(arch),PRESUME_NEON(celt_pitch_xcorr)(_x, _y, xcorr, len, max_pitch))
# endif
-# endif
+#else /* Start !FIXED_POINT */
+/* Float case */
+#if defined(OPUS_ARM_NEON_INTR)
+void celt_pitch_xcorr_float_neon(const opus_val16 *_x, const opus_val16 *_y,
+ opus_val32 *xcorr, int len, int max_pitch);
+#if !defined(OPUS_HAVE_RTCD)
+#define OVERRIDE_PITCH_XCORR (1)
+# define celt_pitch_xcorr(_x, _y, xcorr, len, max_pitch, arch) \
+ ((void)(arch),celt_pitch_xcorr_float_neon(_x, _y, xcorr, len, max_pitch))
+#endif
+#endif
+#endif /* end !FIXED_POINT */
#endif
diff --git a/celt/cpu_support.h b/celt/cpu_support.h
index 71efff1..1d62e2f 100644
--- a/celt/cpu_support.h
+++ b/celt/cpu_support.h
@@ -31,7 +31,8 @@
#include "opus_types.h"
#include "opus_defines.h"
-#if defined(OPUS_HAVE_RTCD) && defined(OPUS_ARM_ASM)
+#if defined(OPUS_HAVE_RTCD) && \
+ (defined(OPUS_ARM_ASM) || defined(OPUS_ARM_NEON_INTR))
#include "arm/armcpu.h"
/* We currently support 4 ARM variants:
diff --git a/celt/pitch.h b/celt/pitch.h
index 5c6e551..4368cc5 100644
--- a/celt/pitch.h
+++ b/celt/pitch.h
@@ -46,7 +46,8 @@
#include "mips/pitch_mipsr1.h"
#endif
-#if defined(OPUS_ARM_ASM) && defined(FIXED_POINT)
+#if ((defined(OPUS_ARM_ASM) && defined(FIXED_POINT)) \
+ || defined(OPUS_ARM_NEON_INTR))
# include "arm/pitch_arm.h"
#endif
@@ -178,7 +179,8 @@ celt_pitch_xcorr_c(const opus_val16 *_x, const opus_val16
*_y,
#if !defined(OVERRIDE_PITCH_XCORR)
/*Is run-time CPU detection enabled on this platform?*/
-# if defined(OPUS_HAVE_RTCD) && defined(OPUS_ARM_ASM)
+# if defined(OPUS_HAVE_RTCD) && \
+ (defined(OPUS_ARM_ASM) || defined(OPUS_ARM_NEON_INTR))
extern
# if defined(FIXED_POINT)
opus_val32
diff --git a/celt/tests/test_unit_mathops.c b/celt/tests/test_unit_mathops.c
index 3076bbf..2db87be 100644
--- a/celt/tests/test_unit_mathops.c
+++ b/celt/tests/test_unit_mathops.c
@@ -56,10 +56,18 @@
#include "x86/celt_lpc_sse.c"
#endif
#include "x86/x86_celt_map.c"
-#elif defined(OPUS_ARM_ASM) && defined(FIXED_POINT)
+#endif
+
+#if defined(OPUS_ARM_NEON_INTR)
+#include "arm/celt_neon_intr.c"
+#endif
+
+#if ((defined(OPUS_ARM_ASM) && defined(FIXED_POINT)) \
+ || defined(OPUS_ARM_NEON_INTR))
#include "arm/arm_celt_map.c"
#endif
+
#ifdef FIXED_POINT
#define WORD "%d"
#else
diff --git a/celt/tests/test_unit_rotation.c b/celt/tests/test_unit_rotation.c
index 37ba74e..bff8469 100644
--- a/celt/tests/test_unit_rotation.c
+++ b/celt/tests/test_unit_rotation.c
@@ -54,7 +54,14 @@
#include "x86/celt_lpc_sse.c"
#endif
#include "x86/x86_celt_map.c"
-#elif defined(OPUS_ARM_ASM) && defined(FIXED_POINT)
+#endif
+
+#if defined(OPUS_ARM_NEON_INTR)
+#include "arm/celt_neon_intr.c"
+#endif
+
+#if ((defined(OPUS_ARM_ASM) && defined(FIXED_POINT)) \
+ || defined(OPUS_ARM_NEON_INTR))
#include "arm/arm_celt_map.c"
#endif
diff --git a/celt_sources.mk b/celt_sources.mk
index 20b1b1b..29ec937 100644
--- a/celt_sources.mk
+++ b/celt_sources.mk
@@ -32,3 +32,6 @@ celt/arm/celt_pitch_xcorr_arm.s
CELT_AM_SOURCES_ARM_ASM = \
celt/arm/armopts.s.in
+
+CELT_SOURCES_ARM_NEON_INTR = \
+celt/arm/celt_neon_intr.c
diff --git a/configure.ac b/configure.ac
index 9b2f51f..6ad4a70 100644
--- a/configure.ac
+++ b/configure.ac
@@ -190,14 +190,14 @@ AC_ARG_ENABLE([rtcd],
[enable_rtcd=yes])
AC_ARG_ENABLE([intrinsics],
- [AS_HELP_STRING([--enable-intrinsics], [Enable intrinsics optimizations
(only for fixed point x86)])],,
+ [AS_HELP_STRING([--enable-intrinsics], [Enable intrinsics optimizations for
ARM(float) X86(fixed)])],,
[enable_intrinsics=no])
rtcd_support=no
cpu_arm=no
AS_IF([test x"${enable_asm}" = x"yes"],[
- inline_optimization="No ASM for your platform, please send
patches"
+ inline_optimization="No in-line ASM for your platform, please send
patches"
case $host_cpu in
arm*)
dnl Currently we only have asm for fixed-point
@@ -343,7 +343,6 @@ AS_IF([test x"${enable_asm}" = x"yes"],[
asm_optimization="disabled"
])
-AM_CONDITIONAL([CPU_ARM], [test "$cpu_arm" = "yes"])
AM_CONDITIONAL([OPUS_ARM_INLINE_ASM],
[test x"${inline_optimization%% *}" = x"ARM"])
AM_CONDITIONAL([OPUS_ARM_EXTERNAL_ASM],
@@ -351,9 +350,52 @@ AM_CONDITIONAL([OPUS_ARM_EXTERNAL_ASM],
AM_CONDITIONAL([HAVE_SSE4_1], [false])
AM_CONDITIONAL([HAVE_SSE2], [false])
+
AS_IF([test x"$enable_intrinsics" = x"yes"],[
-AS_IF([test x"$enable_float" = x"no"],
-[AS_IF([test x"$host_cpu" = x"i386" -o
x"$host_cpu" = x"i686" -o x"$host_cpu" =
x"x86_64"],[
+ case $host_cpu in
+ arm*)
+ cpu_arm=yes
+ AC_MSG_CHECKING(if compiler supports arm neon intrinsics)
+ save_CFLAGS="$CFLAGS"; CFLAGS="-mfpu=neon $CFLAGS"
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[#include <arm_neon.h>]], [])],
+ [
+ OPUS_ARM_NEON_INTR=1
+ AC_MSG_RESULT([yes])
+ ],[
+ OPUS_ARM_NEON_INR=0
+ AC_MSG_RESULT([no])
+ ])
+ CFLAGS="$save_CFLAGS"
+ #Now we know if compiler supports ARM neon intrinsics or not
+
+ #Currently we only have intrinsic optimization for floating point
+ AS_IF([test x"$enable_float" = x"yes"],
+ [
+ AS_IF([test x"$OPUS_ARM_NEON_INTR" = x"1"],
+ [
+ OPUS_ARM_NEON_INTR_CPPFLAGS="-mfpu=neon -O3"
+ AC_SUBST(OPUS_ARM_NEON_INTR_CPPFLAGS)
+ AC_DEFINE([OPUS_ARM_NEON_INTR], 1, [Compiler supports ARMv7 Neon
Intrinsics])
+ AS_IF([test x"enable_rtcd" != x""],
+ [rtcd_support="ARM (ARMv7_Neon_Intrinsics)"],[])
+ enable_intrinsics="$enable_intrinsics
ARMv7_Neon_Intrinsics"
+ dnl Don't see why defining these is necessary to check features
at runtime
+ AC_DEFINE([OPUS_ARM_MAY_HAVE_EDSP], 1, [Define if compiler support
EDSP Instructions])
+ AC_DEFINE([OPUS_ARM_MAY_HAVE_MEDIA], 1, [Define if compiler support
MEDIA Instructions])
+ AC_DEFINE([OPUS_ARM_MAY_HAVE_NEON], 1, [Define if compiler support
NEON instructions])
+ ],
+ [
+ AC_MSG_WARN([Compiler does not support ARM intrinsics])
+ enable_intrinsics=no
+ ])
+ ], [
+ AC_MSG_WARN([Currently on have ARM intrinsics for float])
+ enable_intrinsics=no
+ ])
+ ;;
+ "i386" | "i686" | "x86_64")
+ AS_IF([test x"$enable_float" = x"no"],[
AS_IF([test x"$enable_rtcd" = x"yes"],[
get_cpuid_by_asm="no"
AC_MSG_CHECKING([Get CPU Info])
@@ -423,7 +465,7 @@ AS_IF([test x"$enable_float" = x"no"],
AM_CONDITIONAL([HAVE_SSE2], [true])
AS_IF([test x"$get_cpuid_by_asm" =
x"yes"],[AC_DEFINE([CPU_INFO_BY_ASM], [1], [Get CPU Info by asm
method])],
[AC_DEFINE([CPU_INFO_BY_C], [1], [Get CPU Info by C method])])
- ],[
+ ],[ ##### Else case for AS_IF([test x"$?" =
x"0"])
gcc -Q --help=target | grep "\-msse2 "
AC_MSG_CHECKING([sse2])
AS_IF([test x"$?" = x"0"],[
@@ -446,13 +488,28 @@ AS_IF([test x"$enable_float" = x"no"],
AM_CONDITIONAL([HAVE_SSE2], [true])
AS_IF([test x"$get_cpuid_by_asm" =
x"yes"],[AC_DEFINE([CPU_INFO_BY_ASM], [1], [Get CPU Info by asm
method])],
[AC_DEFINE([CPU_INFO_BY_C], [1], [Get CPU Info by c
method])])
- ],[enable_intrinsics="no"])
+ ],[enable_intrinsics="no"]) #End of AS_IF([test
x"$?" = x"0"]
])
- ], [enable_intrinsics="no"])
-])
-], [enable_intrinsics="no"])
+ ], [
+ enable_intrinsics="no"
+ ]) ## End of AS_IF([test x"$enable_rtcd" = x"yes"]
+],
+[ ## Else case for AS_IF([test x"$enable_float" = x"no"]
+ AC_MSG_WARN([Disabling intrinsics .. x86 intrinsics only avail for fixed
point])
+ enable_intrinsics="no"
+]) ## End of AS_IF([test x"$enable_float" = x"no"]
+ ;;
+ *)
+ AC_MSG_WARN([No intrinsics support for your architecture])
+ enable_intrinsics="no"
+ ;;
+ esac
])
+AM_CONDITIONAL([CPU_ARM], [test "$cpu_arm" = "yes"])
+AM_CONDITIONAL([OPUS_ARM_NEON_INTR],
+ [test x"$OPUS_ARM_NEON_INTR" = x"1"])
+
AS_IF([test x"$enable_rtcd" = x"yes"],[
AS_IF([test x"$rtcd_support" != x"no"],[
AC_DEFINE([OPUS_HAVE_RTCD], [1],
--
1.7.9.5
Timothy B. Terriberry
2014-Dec-09 03:12 UTC
[opus] [RFC PATCH v2] armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics
Viswanath Puttagunta wrote:> + SUMM = vdupq_n_f32(0);It kills me that there's no intrinsic for VMOV.F32 d0, #0 (or at least I couldn't find one), so this takes two instructions instead of one.> + /* Consume 4 elements in x vector and 8 elements in y > + * vector. However, the 8'th element in y never really gets > + * touched in this loop. So, if len == 4, then we only > + * must access y[0] to y[6]. y[7] must not be accessed > + * hence make sure len>4 and not len>=4 > + */ > + while (len > 4) {This can be an if() instead of a while (though it looks like gcc is smart enough to figure that out).> + /* Just unroll the rest of the loop */If you're not going to special case the last 2+1+1 samples, is there a measurable performance difference compared to simply looping?> + yi++; > + switch(len) { > + case 4: > + XX_2 = vld1_dup_f32(xi++); > + SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0); > + YY[0] = vld1q_f32(yi++); > + case 3: > + XX_2 = vld1_dup_f32(xi++); > + SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0); > + YY[0] = vld1q_f32(yi++); > + case 2: > + XX_2 = vld1_dup_f32(xi++); > + SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0); > + YY[0] = vld1q_f32(yi++); > + case 1: > + XX_2 = vld1_dup_f32(xi++); > + SUMM = vmlaq_lane_f32(SUMM, YY[0], XX_2, 0); > + } > + > + vst1q_f32(sum, SUMM); > +} > + > +/* > + * Function: xcorr3to1_kernel_neon_float > + * --------------------------------- > + * Computes single correlation values and stores in *sum > + */ > +void xcorr3to1_kernel_neon_float(const float *x, const float *y, > + float *sum, int len) {I had to think quite a bit about what "3to1" meant (since it is describing the context of the caller, not what the actual function does). I'd follow the naming convention in the existing celt_pitch_xcorr_arm.s, and use "process1", personally.> + int i; > + float32x4_t XX[4]; > + float32x4_t YY[4]; > + float32x4_t SUMM; > + float32x2_t ZERO; > + float32x2x2_t tv; > + float sumi; > + float *xi = x; > + float *yi = y; > + > + ZERO = vdup_n_f32(0); > + SUMM = vdupq_n_f32(0); > + > + /* Work on 16 values per cycle */s/cycle/iteration/ (here and below). In performance-critical code when you say cycle I think machine cycle, and NEON definitely can't process 16 floats in one of those.> + while (len >= 16) {> + /* Accumulate results into single float */ > + tv.val[0] = vadd_f32(vget_low_f32(SUMM), vget_high_f32(SUMM)); > + tv = vtrn_f32(tv.val[0], ZERO); > + tv.val[0] = vadd_f32(tv.val[0], tv.val[1]); > + > + vst1_lane_f32(&sumi, tv.val[0], 0);Accessing tv.val[0] and tv.val[1] directly seems to send these values through the stack, e.g., f4: f3ba7085 vtrn.32 d7, d5 f8: ed0b7b0f vstr d7, [fp, #-60] fc: ed0b5b0d vstr d5, [fp, #-52] ... 114: ed1b6b09 vldr d6, [fp, #-36] 118: ed1b7b0b vldr d7, [fp, #-44] 11c: f2077d06 vadd.f32 d7, d7, d6 120: f483780f vst1.32 {d7[0]}, [r3] Can't you just use float32x2_t tv; tv = vadd_f32(vget_low_f32(SUMM), vget_high_f32(SUMM)); tv = vpadd_f32(tv, tv); (you can get rid of ZERO, then, too)> + for (i = 0; i < len; i++) > + sumi += xi[i] * yi[i]; > + *sum = sumi;This bounces things through the stack into vfp registers, which is a huge stall. I'd continue to use NEON here with vld1_dup_f32()/vmla_f32()/etc.> +}> +#if ((defined(OPUS_ARM_ASM) && defined(FIXED_POINT)) \ > + || defined(OPUS_ARM_NEON_INTR)) > #include "arm/arm_celt_map.c" > #endif > > +Unrelated whitespace change.> - inline_optimization="No ASM for your platform, please send patches" > + inline_optimization="No in-line ASM for your platform, please send patches""inline" is one word.> + AC_MSG_CHECKING(if compiler supports arm neon intrinsics)Capitalize ARM and NEON, please.> + save_CFLAGS="$CFLAGS"; CFLAGS="-mfpu=neon $CFLAGS" > + AC_COMPILE_IFELSE(Can we use AC_LINK_IFELSE? We had a problem where sometimes if SSE/AVX was not available, but the headers existed, the #include would succeed but no functions would get defined. My arm_neon.h seems to be written better than that, but I'd like to guard against other implementations having similar problems (and keep things consistent with the SSE tests).> + [AC_LANG_PROGRAM([[#include <arm_neon.h>]], [])],You also need to include a call to an actual NEON intrinsic here. If the function is not defined, even a call to it here will compile (with an implicit declaration warning), but linking will fail.> + [ > + OPUS_ARM_NEON_INTR=1 > + AC_MSG_RESULT([yes]) > + ],[ > + OPUS_ARM_NEON_INR=0OPUS_ARM_NEON_INTR (you're missing a 'T')> + AC_MSG_RESULT([no]) > + ]) > + CFLAGS="$save_CFLAGS" > + #Now we know if compiler supports ARM neon intrinsics or not > + > + #Currently we only have intrinsic optimization for floating point > + AS_IF([test x"$enable_float" = x"yes"], > + [ > + AS_IF([test x"$OPUS_ARM_NEON_INTR" = x"1"], > + [ > + OPUS_ARM_NEON_INTR_CPPFLAGS="-mfpu=neon -O3"I don't think you should change the optimization level here.
Reasonably Related Threads
- [RFC PATCH v2] cover: armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics
- [PATCH v1] cover: armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics
- [RFC PATCH v3] cover: armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics
- [RFC PATCH v2] armv7: celt_pitch_xcorr: Introduce ARM neon intrinsics
- [RFC PATCHv1] cover: celt_pitch_xcorr: Introduce ARM neon intrinsics