diff --git a/configure b/configure
index de5c354..e988b85 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 71663 .
+# From configure.in Revision: 71704 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 3.1.
 #
@@ -21827,174 +21827,21 @@
 
 fi
 
-# David Gay's code in Python/dtoa.c requires that the FPU uses 53-bit
+# The short float repr introduced in Python 3.1 requires the
+# correctly-rounded string <-> double conversion functions in
+# Python/dtoa.c, which in turn require that the FPU uses 53-bit
 # rounding; this is a particular problem on x86, where the x87 FPU has
 # a default rounding precision of 64 bits.  For gcc/x86, we try to fix
-# this by:
-#
-#   (1) using the SSE2 instruction set when available (it usually is
-#       on modern machines)
-#   (2) using inline assembler to get and set the x87 FPU control word
-#       otherwise.
-#
-# On AMD64 (aka x86-64), gcc automatically enables use of SSE2
-# instructions, so we don't bother trying to detect.
+# this by using inline assembler to get and set the x87 FPU control
+# word.
 
 if test "$GCC" = yes && test -n "`$CC -dM -E - </dev/null | grep i386`"
 then
-    # determine whether we're already using the SSE2 instruction set for math
-    # (e.g., this is true by default on OS X/x86)
-    { echo "$as_me:$LINENO: checking whether SSE2 instructions are already enabled for math" >&5
-echo $ECHO_N "checking whether SSE2 instructions are already enabled for math... $ECHO_C" >&6; }
-    if test -n "`$CC -dM -E - </dev/null | grep __SSE2_MATH__`"
-    then
-        ac_sse2_enabled=yes
-    else
-        ac_sse2_enabled=no
-    fi
-    { echo "$as_me:$LINENO: result: $ac_sse2_enabled" >&5
-echo "${ECHO_T}$ac_sse2_enabled" >&6; }
-
-    # if we're not using SSE2 already, we need to either enable it
-    # (when available), or use inline assembler to get and set the
-    # 387 control word.
-    if test $ac_sse2_enabled = no
-    then
-        # Check cpuid for SSE2 availability.  Bits 25 and 26 of edx tell
-        # us about SSE and SSE2 respectively.
-        { echo "$as_me:$LINENO: checking whether SSE2 instructions are available on this CPU" >&5
-echo $ECHO_N "checking whether SSE2 instructions are available on this CPU... $ECHO_C" >&6; }
-        if test "$cross_compiling" = yes; then
-  ac_cv_cpu_has_sse2=no
-else
-  cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-            int main() {
-                unsigned int ax, bx, cx, dx, func;
-                func = 1U;
-                __asm__ __volatile__ (
-                    "pushl %%ebx\n\t"  /* don't clobber ebx */
-                    "cpuid\n\t"
-                    "movl %%ebx, %1\n\t"
-                    "popl %%ebx"
-                    : "=a" (ax), "=r" (bx), "=c" (cx), "=d" (dx)
-                    : "a" (func)
-                    : "cc" );
-                if ((dx & (1U << 25)) && (dx & (1U << 26)))
-                    return 0;
-                else
-                    return 1;
-            }
-
-_ACEOF
-rm -f conftest$ac_exeext
-if { (ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_link") 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
-  { (case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_try") 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_cv_cpu_has_sse2=yes
-else
-  echo "$as_me: program exited with status $ac_status" >&5
-echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-( exit $ac_status )
-ac_cv_cpu_has_sse2=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
-fi
-
-
-        { echo "$as_me:$LINENO: result: $ac_cv_cpu_has_sse2" >&5
-echo "${ECHO_T}$ac_cv_cpu_has_sse2" >&6; }
-
-        # determine whether gcc accepts options to turn on SSE2
-        { echo "$as_me:$LINENO: checking whether $CC accepts -msse2 -mfpmath=sse" >&5
-echo $ECHO_N "checking whether $CC accepts -msse2 -mfpmath=sse... $ECHO_C" >&6; }
-        ac_save_cc="$CC"
-        CC="$CC -msse2 -mfpmath=sse"
-        if test "$cross_compiling" = yes; then
-  ac_cv_msse2_ok=no
-else
-  cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-int main() { return 0; }
-_ACEOF
-rm -f conftest$ac_exeext
-if { (ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_link") 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
-  { (case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_try") 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_cv_msse2_ok=yes
-else
-  echo "$as_me: program exited with status $ac_status" >&5
-echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-( exit $ac_status )
-ac_cv_msse2_ok=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
-fi
-
-
-        CC="$ac_save_cc"
-        { echo "$as_me:$LINENO: result: $ac_cv_msse2_ok" >&5
-echo "${ECHO_T}$ac_cv_msse2_ok" >&6; }
-
-        if test $ac_cv_cpu_has_sse2 = yes && test $ac_cv_msse2_ok = yes
-        then
-            BASECFLAGS="$BASECFLAGS -msse2 -mfpmath=sse"
-        else
-            # SSE2 doesn't appear to be available.  Check that it's okay
-            # to use gcc inline assembler to get and set x87 control word
-
-cat >>confdefs.h <<\_ACEOF
-#define USING_X87_FPU 1
-_ACEOF
-
-            { echo "$as_me:$LINENO: checking whether we can use gcc inline assembler to get and set x87 control word" >&5
+    # Check that it's okay to use gcc inline assembler to get and set
+    # x87 control word
+    { echo "$as_me:$LINENO: checking whether we can use gcc inline assembler to get and set x87 control word" >&5
 echo $ECHO_N "checking whether we can use gcc inline assembler to get and set x87 control word... $ECHO_C" >&6; }
-            cat >conftest.$ac_ext <<_ACEOF
+    cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
 cat confdefs.h >>conftest.$ac_ext
@@ -22005,9 +21852,9 @@
 main ()
 {
 
-              unsigned short cw;
-              __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
-              __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
+      unsigned short cw;
+      __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
+      __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
 
   ;
   return 0;
@@ -22039,17 +21886,15 @@
 fi
 
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-            { echo "$as_me:$LINENO: result: $have_gcc_asm_for_x87" >&5
+    { echo "$as_me:$LINENO: result: $have_gcc_asm_for_x87" >&5
 echo "${ECHO_T}$have_gcc_asm_for_x87" >&6; }
-            if test "$have_gcc_asm_for_x87" = yes
-            then
+    if test "$have_gcc_asm_for_x87" = yes
+    then
 
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_GCC_ASM_FOR_X87 1
 _ACEOF
 
-            fi
-        fi
     fi
 fi