60 lines
1.7 KiB
Plaintext
60 lines
1.7 KiB
Plaintext
# @synopsis AX_CHECK_ARM_NEON
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#
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# Does the machine support the ARM NEON instruction set?
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# @version 1.01 Feb 11 2013
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# @author Steve Underwood
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#
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# Permission to use, copy, modify, distribute, and sell this file for any
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# purpose is hereby granted without fee, provided that the above copyright
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# and this permission notice appear in all copies. No representations are
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# made about the suitability of this software for any purpose. It is
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# provided "as is" without express or implied warranty.
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AC_DEFUN([AX_CHECK_ARM_NEON],
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[AC_CACHE_CHECK([if $1 supports the ARM NEON instructions set],
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ac_cv_symbol_arm_neon,
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[# Initialize to unknown
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ac_cv_symbol_arm_neon="no"
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case "${ax_cv_c_compiler_vendor}" in
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gnu)
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save_CFLAGS="${CFLAGS}"
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CFLAGS="${CFLAGS} -mfpu=neon -mfloat-abi=hard"
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AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[
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#include <inttypes.h>
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#include <arm_neon.h>
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int32x4_t testfunc(int16_t *a, int16_t *b)
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{
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return vmull_s16(vld1_s16(a), vld1_s16(b));
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}
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],
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[
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volatile int32x4_t z;
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int16_t x[[8]];
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int16_t y[[8]];
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z = testfunc(x, y);
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]
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)],
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[AC_MSG_RESULT([yes])
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COMP_VENDOR_CFLAGS="-mfpu=neon $COMP_VENDOR_CFLAGS"
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COMP_VENDOR_CXXFLAGS="-mfpu=neon $COMP_VENDOR_CXXFLAGS"
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ac_cv_symbol_arm_neon="yes"],
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[AC_MSG_RESULT([no])],
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dnl Assume "no" if cross-compiling
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[AC_MSG_RESULT([no])]
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)
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CFLAGS="${save_CFLAGS}"
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;;
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esac])
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AS_IF([test AS_VAR_GET(ac_cv_symbol_arm_neon) = yes], [$2], [$3])[]dnl
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]) # AX_CHECK_ARM_NEON
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