Removing all m4 references for CPUID by creating special C program to parse

CPUID and directly doing compiler checks in autoconf.ac

1 files changed, 68 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index b4d420e..3531021 100644
--- a/configure.ac
+++ b/configure.ac
@@ -97,6 +97,74 @@ dnl Expand the sources and objects needed to build the library
 AC_SUBST(ac_aux_dir)
 AC_SUBST(OBJECTS)
 
+dnl Do CPUID and associated compiler flag checks
+
+SUPPORTED_FLAGS=""
+$CC - -E -mmmx </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="-mmmx"
+  AC_MSG_RESULT([$CC supports -mmmx])
+fi
+$CC - -E -msse </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="$SUPPORTED_FLAGS -msse"
+  AC_MSG_RESULT([$CC supports -msse])
+fi
+$CC - -E -msse2 </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="$SUPPORTED_FLAGS -msse2"
+  AC_MSG_RESULT([$CC supports -msse2])
+fi
+$CC - -E -msse3 </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="$SUPPORTED_FLAGS -msse3"
+  AC_MSG_RESULT([$CC supports -msse3])
+fi
+$CC - -E -mssse3 </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="$SUPPORTED_FLAGS -mssse3"
+  AC_MSG_RESULT([$CC supports -mssse3])
+fi
+$CC - -E -msse4.1 </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="$SUPPORTED_FLAGS -msse4.1"
+  AC_MSG_RESULT([$CC supports -msse4.1])
+fi
+$CC - -E -msse4.2 </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="$SUPPORTED_FLAGS -msse4.2"
+  AC_MSG_RESULT([$CC supports -msse4.2])
+fi
+$CC - -E -mavx </dev/null >/dev/null 2>&1
+if [[ $? == "0" ]]; then
+  SUPPORTED_FLAGS="$SUPPORTED_FLAGS -mavx"
+  AC_MSG_RESULT([$CC supports -mavx])
+fi
+
+# Detect the SIMD features supported by both the compiler and the CPU
+SIMD_FLAGS=""
+cat get_flags_from_cpuid.c | sed "s/FLAGSFROMAUTOCONF/${SUPPORTED_FLAGS}/" | $CC -x c -g - -o get_flags_from_cpuid
+if [[ -e ./get_flags_from_cpuid ]]; then
+  chmod 755 get_flags_from_cpuid; ./get_flags_from_cpuid; rm ./get_flags_from_cpuid
+  if [[ -e compiler_flags ]]; then
+    SIMD_FLAGS=`cat compiler_flags`
+    rm -f compiler_flags
+  else
+    AC_MSG_WARN([Could not run the CPUID detection program])
+  fi
+else
+  AC_MSG_WARN([Could not compile the CPUID detection program])
+fi
+
+AC_MSG_RESULT([Generating with SIMD flags: $SIMD_FLAGS])
+CFLAGS="$CFLAGS $SIMD_FLAGS"
+
+# Certain code may be dependent on 32 vs. 64-bit arch, so add a 
+# flag for 64-bit
+if test "$ac_cv_sizeof_long" -eq 8; then
+  CFLAGS="$CFLAGS -DARCH_64"
+fi
+
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