Issue #7652: Integrate the decimal floating point libmpdec library to speed
up the decimal module. Performance gains of the new C implementation are
between 12x and 80x, depending on the application.
diff --git a/configure.ac b/configure.ac
index 0ae5003..78bcbe7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1483,6 +1483,8 @@
AC_TYPE_INT64_T
AC_CHECK_TYPE(ssize_t,
AC_DEFINE(HAVE_SSIZE_T, 1, [Define if your compiler provides ssize_t]),,)
+AC_CHECK_TYPE(__uint128_t,
+ AC_DEFINE(HAVE_GCC_UINT128_T, 1, [Define if your compiler provides __uint128_t]),,)
# Sizes of various common basic types
# ANSI C requires sizeof(char) == 1, so no need to check it
@@ -3329,6 +3331,21 @@
fi],
[AC_MSG_RESULT(default LIBC="$LIBC")])
+# **************************************
+# * Check for gcc x64 inline assembler *
+# **************************************
+
+AC_MSG_CHECKING(for x64 gcc inline assembler)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
+ __asm__ __volatile__ ("movq %rcx, %rax");
+]])],[have_gcc_asm_for_x64=yes],[have_gcc_asm_for_x64=no])
+AC_MSG_RESULT($have_gcc_asm_for_x64)
+if test "$have_gcc_asm_for_x64" = yes
+then
+ AC_DEFINE(HAVE_GCC_ASM_FOR_X64, 1,
+ [Define if we can use x64 gcc inline assembler])
+fi
+
# **************************************************
# * Check for various properties of floating point *
# **************************************************
@@ -4333,6 +4350,89 @@
done
AC_MSG_RESULT(done)
+# Availability of -O2:
+AC_MSG_CHECKING(for -O2)
+saved_cflags="$CFLAGS"
+CFLAGS="-O2"
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
+]])],[have_O2=yes],[have_O2=no])
+AC_MSG_RESULT($have_O2)
+CFLAGS="$saved_cflags"
+
+# _FORTIFY_SOURCE wrappers for memmove and bcopy are incorrect:
+# http://sourceware.org/ml/libc-alpha/2010-12/msg00009.html
+AC_MSG_CHECKING(for glibc _FORTIFY_SOURCE/memmove bug)
+saved_cflags="$CFLAGS"
+CFLAGS="-O2 -D_FORTIFY_SOURCE=2"
+if test "$have_O2" = no; then
+ CFLAGS=""
+fi
+AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+void foo(void *p, void *q) { memmove(p, q, 19); }
+int main() {
+ char a[32] = "123456789000000000";
+ foo(&a[9], a);
+ if (strcmp(a, "123456789123456789000000000") != 0)
+ return 1;
+ foo(a, &a[9]);
+ if (strcmp(a, "123456789000000000") != 0)
+ return 1;
+ return 0;
+}
+]])],
+[have_glibc_memmove_bug=no],
+[have_glibc_memmove_bug=yes],
+[have_glibc_memmove_bug=undefined])
+CFLAGS="$saved_cflags"
+AC_MSG_RESULT($have_glibc_memmove_bug)
+if test "$have_glibc_memmove_bug" = yes; then
+ AC_DEFINE(HAVE_GLIBC_MEMMOVE_BUG, 1,
+ [Define if glibc has incorrect _FORTIFY_SOURCE wrappers
+ for memmove and bcopy.])
+fi
+
+if test "$have_gcc_asm_for_x87" = yes; then
+ # Some versions of gcc miscompile inline asm:
+ # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491
+ # http://gcc.gnu.org/ml/gcc/2010-11/msg00366.html
+ case $CC in
+ *gcc*)
+ AC_MSG_CHECKING(for gcc ipa-pure-const bug)
+ saved_cflags="$CFLAGS"
+ CFLAGS="-O2"
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ __attribute__((noinline)) int
+ foo(int *p) {
+ int r;
+ asm ( "movl \$6, (%1)\n\t"
+ "xorl %0, %0\n\t"
+ : "=r" (r) : "r" (p) : "memory"
+ );
+ return r;
+ }
+ int main() {
+ int p = 8;
+ if ((foo(&p) ? : p) != 6)
+ return 1;
+ return 0;
+ }
+ ]])],
+ [have_ipa_pure_const_bug=no],
+ [have_ipa_pure_const_bug=yes],
+ [have_ipa_pure_const_bug=undefined])
+ CFLAGS="$saved_cflags"
+ AC_MSG_RESULT($have_ipa_pure_const_bug)
+ if test "$have_ipa_pure_const_bug" = yes; then
+ AC_DEFINE(HAVE_IPA_PURE_CONST_BUG, 1,
+ [Define if gcc has the ipa-pure-const bug.])
+ fi
+ ;;
+ esac
+fi
+
# generate output files
AC_CONFIG_FILES(Makefile.pre Modules/Setup.config Misc/python.pc)
AC_CONFIG_FILES([Modules/ld_so_aix], [chmod +x Modules/ld_so_aix])