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With gcc-4.4 at least, the raw asm.s files will always successfully compile even if the default -march for the compiler would not support those instructions. So switch to testing the inline asm versions, where the compiler will barf if they aren't supported by the default arch if no -march is explicitly given, or if they aren't supported by the requested -march when it is.
67 lines
1.7 KiB
Text
67 lines
1.7 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 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([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_COMPILE_IFELSE([AC_LANG_PROGRAM([],[__asm__("vorr d0,d0,d0")])],
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[AC_MSG_RESULT([yes])
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$1],
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[AC_MSG_RESULT([no])
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$2])
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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_COMPILE_IFELSE([AC_LANG_PROGRAM([],[__asm__("shadd8 r3,r3,r3")])],
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[AC_MSG_RESULT([yes])
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$1],
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[AC_MSG_RESULT([no])
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$2])
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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_COMPILE_IFELSE([AC_LANG_PROGRAM([],[__asm__("qadd r3,r3,r3")])],
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[AC_MSG_RESULT([yes])
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$1],
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[AC_MSG_RESULT([no])
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$2])
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])
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