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972a34ec2c
Original patch by Aurélien Zanelli <aurelien.zanelli@parrot.com>: http://lists.xiph.org/pipermail/opus/2013-May/002078.html Revised version: - Add autconf detection (ported from libtheora). - Rename ARM5E to ARMv5E (an ARM5 is not the same thing as ARMv5!). - Use actual macros so they can still be selectively overridden. - Split out ARMv4 parts and add a few more ARMv4 macros. - Label blocks to make them easy to find in generated assembly. - Fix MULT16_32_Q15() so we can pass make check. The MDCT test passes in values larger than 2**30 for b. The new version should be just as fast (or faster, since it's easier to merge the shift with following instructions), and there's no appreciable impact on accuracy (FFT/MDCT SNR actually goes up in most cases). - Fix register constraints. We were using early-clobber flags in a bunch of places that didn't need them, and commutative-pair flags in a bunch of places that weren't actually commutative. This was Jean-Marc's fault (the original code came from Speex). - Simplify silk_CLZ16(). - Port over iFFT C_MULC asm by Andree Buschmann <AndreeBuschmann@t-online.de> from Rockbox. - Speed up the C_MULC asm by using LDRD, allowing more flexible addressing, re-ordering instructions to avoid some stalls, allowing more flexible register allocation, and getting things out of the inline asm block so the compiler can schedule them better. - Add C_MUL and C_MUL4 asm for the FFT to the encoder based, on the new C_MULC. In total, this patch gives a 22.3% speed-up on test_opus_encoder on a 600 MHz Cortex A8 using gcc 4.2.1, When restricted to ARMv4 optimizations, it gives a 9.6% speed-up on the same processor/compiler. On the conformance test vectors: Average mono quality is 97.0583 % Average stereo quality is 97.775 %
106 lines
2 KiB
Text
106 lines
2 KiB
Text
dnl as-gcc-inline-assembly.m4 0.1.0
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dnl autostars m4 macro for detection of gcc inline assembly
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dnl David Schleef <ds@schleef.org>
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dnl $Id$
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dnl AS_COMPILER_FLAG(ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED])
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dnl Tries to compile with the given CFLAGS.
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dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags,
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dnl and ACTION-IF-NOT-ACCEPTED otherwise.
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AC_DEFUN([AS_GCC_INLINE_ASSEMBLY],
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[
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AC_MSG_CHECKING([if compiler supports gcc-style inline assembly])
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AC_TRY_COMPILE([], [
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#ifdef __GNUC_MINOR__
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#if (__GNUC__ * 1000 + __GNUC_MINOR__) < 3004
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#error GCC before 3.4 has critical bugs compiling inline assembly
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#endif
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#endif
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__asm__ (""::) ], [flag_ok=yes], [flag_ok=no])
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if test "X$flag_ok" = Xyes ; then
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$1
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true
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else
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$2
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true
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fi
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AC_MSG_RESULT([$flag_ok])
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])
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AC_DEFUN([AC_TRY_ASSEMBLE],
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[ac_c_ext=$ac_ext
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ac_ext=${ac_s_ext-s}
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cat > conftest.$ac_ext <<EOF
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.file "configure"
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[$1]
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EOF
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if AC_TRY_EVAL(ac_compile); then
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ac_ext=$ac_c_ext
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ifelse([$2], , :, [ $2
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rm -rf conftest*])
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else
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echo "configure: failed program was:" >&AC_FD_CC
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cat conftest.$ac_ext >&AC_FD_CC
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ac_ext=$ac_c_ext
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ifelse([$3], , , [ rm -rf conftest*
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$3
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])dnl
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fi
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rm -rf conftest*])
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AC_DEFUN([AS_ASM_ARM_NEON],
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[
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AC_MSG_CHECKING([if assembler supports NEON instructions on ARM])
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AC_TRY_ASSEMBLE([vorr d0,d0,d0], [flag_ok=yes], [flag_ok=no])
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if test "X$flag_ok" = Xyes ; then
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$1
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true
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else
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$2
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true
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fi
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AC_MSG_RESULT([$flag_ok])
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])
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AC_DEFUN([AS_ASM_ARM_MEDIA],
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[
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AC_MSG_CHECKING([if assembler supports ARMv6 media instructions on ARM])
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AC_TRY_ASSEMBLE([shadd8 r3,r3,r3], [flag_ok=yes], [flag_ok=no])
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if test "X$flag_ok" = Xyes ; then
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$1
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true
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else
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$2
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true
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fi
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AC_MSG_RESULT([$flag_ok])
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])
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AC_DEFUN([AS_ASM_ARM_EDSP],
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[
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AC_MSG_CHECKING([if assembler supports EDSP instructions on ARM])
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AC_TRY_ASSEMBLE([qadd r3,r3,r3], [flag_ok=yes], [flag_ok=no])
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if test "X$flag_ok" = Xyes ; then
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$1
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true
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else
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$2
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true
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fi
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AC_MSG_RESULT([$flag_ok])
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])
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