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add runtime NEON detection
configure gets 2 new options: --enable-neon / --enable-neon-rtcd the NEON modules are split to their own convenience lib and built with auto-detected flags if none are given via CFLAGS. the /proc/cpuinfo check will only be used for armv7 targets whose toolchain does not enable NEON by default or didn't have NEON forced by the CFLAGS from the environment. Change-Id: I2755bc1d065d5d6ee6143b44978c2082f8bef1c5
This commit is contained in:
James Zern
parent
c80b9fc8fc
commit
74fb56fb5d
54
configure.ac
54
configure.ac
@ -178,6 +178,60 @@ AS_IF([test "x$enable_sse2" != "xno"], [
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CFLAGS=$SAVED_CFLAGS])
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AC_SUBST([SSE2_FLAGS])])
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AC_ARG_ENABLE([neon],
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AS_HELP_STRING([--disable-neon],
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[Disable detection of NEON support
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@<:@default=auto@:>@]))
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AC_ARG_ENABLE([neon_rtcd],
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AS_HELP_STRING([--disable-neon-rtcd],
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[Disable runtime detection of NEON support via
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/proc/cpuinfo on Linux hosts
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@<:@default=auto@:>@]))
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# For ARM(7) hosts:
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# Both NEON flags unset and NEON support detected = build all modules with NEON
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# NEON detected with the use of -mfpu=neon = build only NEON modules with NEON
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AS_IF([test "x$enable_neon" != "xno"], [
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case "$host_cpu" in
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arm|armv7*)
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dnl Test for NEON support with no flags.
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AC_CHECK_HEADER([arm_neon.h],
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[AC_DEFINE(WEBP_HAVE_NEON, [1],
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[Set to 1 if NEON is supported])],
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dnl Test for NEON support using -mfpu=neon
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[unset ac_cv_header_arm_neon_h
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NEON_FLAGS="$INTRINSICS_CFLAGS $NEON_FLAGS"
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TEST_AND_ADD_CFLAGS([NEON_FLAGS], [-mfpu=neon])
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AS_IF([test -n "$NEON_FLAGS"], [
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SAVED_CFLAGS=$CFLAGS
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CFLAGS="$CFLAGS $NEON_FLAGS"
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AC_CHECK_HEADER([arm_neon.h],
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[AS_IF([test "${host_os%%-*}" = "linux" -o \
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"x$enable_neon_rtcd" = "xno"], [
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AC_DEFINE(WEBP_HAVE_NEON, [1],
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[Set to 1 if NEON is supported])],
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[AC_MSG_WARN(m4_normalize([NEON runtime
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cpu-detection is unavailble for
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${host_os%%-*}. Force with
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CFLAGS=-mfpu=neon or
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--disable-neon-rtcd.]))
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enable_neon_rtcd=no
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NEON_FLAGS=""])],
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[NEON_FLAGS=""])
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CFLAGS=$SAVED_CFLAGS
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AS_IF([test -n "$NEON_FLAGS"], [
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dnl If NEON is available and rtcd is disabled apply
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dnl NEON_FLAGS globally.
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AS_IF([test "x$enable_neon_rtcd" = "xno"], [
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AM_CFLAGS="$AM_CFLAGS $NEON_FLAGS"
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NEON_FLAGS=""],
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[AC_DEFINE(WEBP_HAVE_NEON_RTCD, [1],
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[Set to 1 if runtime detection of NEON
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is enabled])])])])])
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;;
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esac
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AC_SUBST([NEON_FLAGS])])
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dnl === CLEAR_LIBVARS([var_pfx])
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dnl === Clears <var_pfx>_{INCLUDES,LIBS}.
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AC_DEFUN([CLEAR_LIBVARS], [$1_INCLUDES=""; $1_LIBS=""])
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@ -1,6 +1,7 @@
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noinst_LTLIBRARIES = libwebpdsp.la libwebpdsp_avx2.la
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noinst_LTLIBRARIES += libwebpdsp_sse2.la libwebpdspdecode_sse2.la
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noinst_LTLIBRARIES += libwebpdsp_sse41.la libwebpdspdecode_sse41.la
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noinst_LTLIBRARIES += libwebpdsp_neon.la libwebpdspdecode_neon.la
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if BUILD_LIBWEBPDECODER
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noinst_LTLIBRARIES += libwebpdspdecode.la
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@ -18,23 +19,18 @@ COMMON_SOURCES += dec.c
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COMMON_SOURCES += dec_clip_tables.c
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COMMON_SOURCES += dec_mips32.c
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COMMON_SOURCES += dec_mips_dsp_r2.c
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COMMON_SOURCES += dec_neon.c
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COMMON_SOURCES += dsp.h
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COMMON_SOURCES += filters.c
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COMMON_SOURCES += filters_mips_dsp_r2.c
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COMMON_SOURCES += lossless.c
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COMMON_SOURCES += lossless.h
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COMMON_SOURCES += lossless_mips_dsp_r2.c
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COMMON_SOURCES += lossless_neon.c
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COMMON_SOURCES += mips_macro.h
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COMMON_SOURCES += neon.h
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COMMON_SOURCES += rescaler.c
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COMMON_SOURCES += rescaler_mips32.c
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COMMON_SOURCES += rescaler_mips_dsp_r2.c
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COMMON_SOURCES += rescaler_neon.c
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COMMON_SOURCES += upsampling.c
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COMMON_SOURCES += upsampling_mips_dsp_r2.c
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COMMON_SOURCES += upsampling_neon.c
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COMMON_SOURCES += yuv.c
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COMMON_SOURCES += yuv.h
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COMMON_SOURCES += yuv_mips32.c
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@ -49,11 +45,9 @@ ENC_SOURCES += cost_mips_dsp_r2.c
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ENC_SOURCES += enc.c
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ENC_SOURCES += enc_mips32.c
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ENC_SOURCES += enc_mips_dsp_r2.c
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ENC_SOURCES += enc_neon.c
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ENC_SOURCES += lossless_enc.c
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ENC_SOURCES += lossless_enc_mips32.c
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ENC_SOURCES += lossless_enc_mips_dsp_r2.c
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ENC_SOURCES += lossless_enc_neon.c
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libwebpdsp_avx2_la_SOURCES =
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libwebpdsp_avx2_la_SOURCES += enc_avx2.c
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@ -77,6 +71,15 @@ libwebpdspdecode_sse2_la_SOURCES += yuv_sse2.c
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libwebpdspdecode_sse2_la_CPPFLAGS = $(libwebpdsp_sse2_la_CPPFLAGS)
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libwebpdspdecode_sse2_la_CFLAGS = $(libwebpdsp_sse2_la_CFLAGS)
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libwebpdspdecode_neon_la_SOURCES =
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libwebpdspdecode_neon_la_SOURCES += dec_neon.c
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libwebpdspdecode_neon_la_SOURCES += lossless_neon.c
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libwebpdspdecode_neon_la_SOURCES += neon.h
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libwebpdspdecode_neon_la_SOURCES += rescaler_neon.c
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libwebpdspdecode_neon_la_SOURCES += upsampling_neon.c
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libwebpdspdecode_neon_la_CPPFLAGS = $(libwebpdsp_neon_la_CPPFLAGS)
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libwebpdspdecode_neon_la_CFLAGS = $(libwebpdsp_neon_la_CFLAGS)
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libwebpdsp_sse2_la_SOURCES =
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libwebpdsp_sse2_la_SOURCES += argb_sse2.c
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libwebpdsp_sse2_la_SOURCES += cost_sse2.c
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@ -93,6 +96,13 @@ libwebpdsp_sse41_la_CPPFLAGS = $(libwebpdsp_la_CPPFLAGS)
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libwebpdsp_sse41_la_CFLAGS = $(AM_CFLAGS) $(SSE41_FLAGS)
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libwebpdsp_sse41_la_LIBADD = libwebpdspdecode_sse41.la
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libwebpdsp_neon_la_SOURCES =
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libwebpdsp_neon_la_SOURCES += enc_neon.c
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libwebpdsp_neon_la_SOURCES += lossless_enc_neon.c
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libwebpdsp_neon_la_CPPFLAGS = $(libwebpdsp_la_CPPFLAGS)
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libwebpdsp_neon_la_CFLAGS = $(AM_CFLAGS) $(NEON_FLAGS)
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libwebpdsp_neon_la_LIBADD = libwebpdspdecode_neon.la
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libwebpdsp_la_SOURCES = $(COMMON_SOURCES) $(ENC_SOURCES)
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noinst_HEADERS =
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@ -106,6 +116,7 @@ libwebpdsp_la_LDFLAGS = -lm
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libwebpdsp_la_LIBADD =
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libwebpdsp_la_LIBADD += libwebpdsp_avx2.la libwebpdsp_sse2.la
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libwebpdsp_la_LIBADD += libwebpdsp_sse41.la
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libwebpdsp_la_LIBADD += libwebpdsp_neon.la
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if BUILD_LIBWEBPDECODER
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libwebpdspdecode_la_SOURCES = $(COMMON_SOURCES)
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@ -115,4 +126,5 @@ if BUILD_LIBWEBPDECODER
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libwebpdspdecode_la_LIBADD =
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libwebpdspdecode_la_LIBADD += libwebpdspdecode_sse2.la
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libwebpdspdecode_la_LIBADD += libwebpdspdecode_sse41.la
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libwebpdspdecode_la_LIBADD += libwebpdspdecode_neon.la
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endif
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@ -13,6 +13,11 @@
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#include "./dsp.h"
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#if defined(WEBP_HAVE_NEON_RTCD)
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#include <stdio.h>
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#include <string.h>
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#endif
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#if defined(WEBP_ANDROID_NEON)
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#include <cpu-features.h>
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#endif
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@ -142,8 +147,27 @@ VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
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// define a dummy function to enable turning off NEON at runtime by setting
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// VP8DecGetCPUInfo = NULL
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static int armCPUInfo(CPUFeature feature) {
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(void)feature;
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if (feature != kNEON) return 0;
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#if defined(__linux__) && defined(WEBP_HAVE_NEON_RTCD)
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{
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int has_neon = 0;
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char line[200];
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FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
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if (cpuinfo == NULL) return 0;
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while (fgets(line, sizeof(line), cpuinfo)) {
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if (!strncmp(line, "Features", 8)) {
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if (strstr(line, " neon ") != NULL) {
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has_neon = 1;
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break;
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}
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}
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}
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fclose(cpuinfo);
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return has_neon;
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}
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#else
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return 1;
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#endif
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}
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VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
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#elif defined(WEBP_USE_MIPS32) || defined(WEBP_USE_MIPS_DSP_R2)
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@ -72,7 +72,8 @@ extern "C" {
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// The intrinsics currently cause compiler errors with arm-nacl-gcc and the
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// inline assembly would need to be modified for use with Native Client.
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#if (defined(__ARM_NEON__) || defined(WEBP_ANDROID_NEON) || \
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defined(__aarch64__)) && !defined(__native_client__)
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defined(__aarch64__) || defined(WEBP_HAVE_NEON)) && \
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!defined(__native_client__)
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#define WEBP_USE_NEON
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#endif
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