X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fmain.cc;h=759091ee11f4adc11b72bde8aeaa26d6d2c94365;hb=5db2447d084320c092768bb7c5683f76e10e4a8a;hp=3c0f7ae88eb7a4f28a065d1555ff4ffcf9c07aa9;hpb=e93e62137f606881f3e1350423734523b9812673;p=lilypond.git

diff --git a/lily/main.cc b/lily/main.cc
index 3c0f7ae88e..759091ee11 100644
--- a/lily/main.cc
+++ b/lily/main.cc
@@ -166,6 +166,29 @@ static Long_option_init options_static[]
 
 char const *LILYPOND_DATADIR = PACKAGE_DATADIR "/" TOPLEVEL_VERSION;
 
+
+/* x86 defaults to using 80-bit extended precision arithmetic. This can cause
+   problems because the truncation from 80 bits to 64 bits can occur in
+   unpredictable places. To get around this, we tell the x87 FPU to use only
+   double precision. Note that this is not needed for x86_64 because that uses
+   the SSE unit by default instead of the x87 FPU. */
+#if ((defined(__x86__) || defined(__i386__)) \
+  && defined(HAVE_FPU_CONTROL_H) && (HAVE_FPU_CONTROL_H == 1))
+
+#include <fpu_control.h>
+static void configure_fpu() {
+  fpu_control_t fpu_control = 0x027f;
+  _FPU_SETCW (fpu_control);
+}
+
+#else
+
+static void configure_fpu() {
+}
+
+#endif /* defined(__x86__) || defined(__i386__) */
+
+
 static void
 env_var_info (FILE *out, char const *key)
 {
@@ -217,9 +240,10 @@ static void
 notice ()
 {
   identify (stdout);
-  puts (_f (NOTICE, PROGRAM_NAME).c_str ());
   printf ("\n");
   copyright ();
+  printf ("\n");
+  puts (_f (NOTICE, PROGRAM_NAME).c_str ());
 }
 
 LY_DEFINE (ly_usage, "ly:usage",
@@ -534,7 +558,6 @@ parse_argv (int argc, char **argv)
 
   if (show_help)
     {
-      identify (stdout);
       ly_usage ();
       if (be_verbose_global)
 	dir_info (stdout);
@@ -569,6 +592,8 @@ vector<string> start_environment_global;
 int
 main (int argc, char **argv, char **envp)
 {
+  configure_fpu();
+
   for (char **p = envp; *p; p++)
     start_environment_global.push_back(*p);