Update copyright years.

[thirdparty/gcc.git] / gcc / common / config / avr / avr-common.c

diff --git a/gcc/common/config/avr/avr-common.c b/gcc/common/config/avr/avr-common.c
index 231ed57a16054cf2561a8955a57b6fdff5555482..676b87849275454a5b089d8f32f4fcfeb341f9d5 100644 (file)
--- a/gcc/common/config/avr/avr-common.c
+++ b/gcc/common/config/avr/avr-common.c
@@ -1,5 +1,5 @@
 /* Common hooks for ATMEL AVR.
-   Copyright (C) 1998-2014 Free Software Foundation, Inc.
+   Copyright (C) 1998-2020 Free Software Foundation, Inc.
 
    This file is part of GCC.
 
@@ -23,14 +23,124 @@
 #include "tm.h"
 #include "common/common-target.h"
 #include "common/common-target-def.h"
+#include "opts.h"
+#include "diagnostic.h"
 
 /* Implement TARGET_OPTION_OPTIMIZATION_TABLE.  */
 static const struct default_options avr_option_optimization_table[] =
   {
-    { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
+    // With -fdelete-null-pointer-checks option, the compiler assumes
+    // that dereferencing of a null pointer would halt the program.
+    // For AVR this assumption is not true and a program can safely
+    // dereference null pointers.  Changes made by this option may not
+    // work properly for AVR.  So disable this option.
+    { OPT_LEVELS_ALL, OPT_fdelete_null_pointer_checks, NULL, 0 },
+    // The only effect of -fcaller-saves might be that it triggers
+    // a frame without need when it tries to be smart around calls.
+    { OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
+    { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_mgas_isr_prologues, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_mmain_is_OS_task, NULL, 1 },
+    /* Allow optimizer to introduce store data races. This used to be the
+       default -- it was changed because bigger targets did not see any
+       performance decrease. For the AVR though, disallowing data races
+       introduces additional code in LIM and increases reg pressure.  */
+    { OPT_LEVELS_ALL, OPT_fallow_store_data_races, NULL, 1 },
+
+#if defined (WITH_DOUBLE64)
+    { OPT_LEVELS_ALL, OPT_mdouble_, NULL, 64 },
+#elif defined (WITH_DOUBLE32)
+    { OPT_LEVELS_ALL, OPT_mdouble_, NULL, 32 },
+#else
+#error "align this with config.gcc"
+#endif
+
+#if defined (WITH_LONG_DOUBLE64)
+    { OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 64 },
+#elif defined (WITH_LONG_DOUBLE32)
+    { OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 32 },
+#else
+#error "align this with config.gcc"
+#endif
+
     { OPT_LEVELS_NONE, 0, NULL, 0 }
   };
 
+
+/* Implement `TARGET_HANDLE_OPTION'.  */
+
+/* This is the same logic that driver-avr.c:avr_double_lib() applies
+   during DRIVER_SELF_SPECS, but this time we complain about -mdouble=
+   and -mlong-double= that are not provided by --with-double= resp.
+   --with-long-double=  */
+
+static bool
+avr_handle_option (struct gcc_options *opts, struct gcc_options*,
+                   const struct cl_decoded_option *decoded, location_t loc)
+{
+  int value = decoded->value;
+
+  switch (decoded->opt_index)
+    {
+    case OPT_mdouble_:
+      if (value == 64)
+        {
+#if !defined (HAVE_DOUBLE64)
+          error_at (loc, "option %<-mdouble=64%> is only available if "
+                    "configured %<--with-double={64|64,32|32,64}%>");
+#endif
+          opts->x_avr_long_double = 64;
+        }
+      else if (value == 32)
+        {
+#if !defined (HAVE_DOUBLE32)
+          error_at (loc, "option %<-mdouble=32%> is only available if "
+                    "configured %<--with-double={|32|32,64|64,32}%>");
+#endif
+        }
+      else
+        gcc_unreachable();
+
+#if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
+      opts->x_avr_long_double = value;
+#endif
+      break; // -mdouble=
+
+    case OPT_mlong_double_:
+      if (value == 64)
+        {
+#if !defined (HAVE_LONG_DOUBLE64)
+          error_at (loc, "option %<-mlong-double=64%> is only available if "
+                    "configured %<--with-long-double={64|64,32|32,64}%>, "
+                    "or %<--with-long-double=double%> together with "
+                    "%<--with-double={64|64,32|32,64}%>");
+#endif
+        }
+      else if (value == 32)
+        {
+#if !defined (HAVE_LONG_DOUBLE32)
+          error_at (loc, "option %<-mlong-double=32%> is only available if "
+                    "configured %<--with-long-double={|32|32,64|64,32}%>, "
+                    "or %<--with-long-double=double%> together with "
+                    "%<--with-double={|32|32,64|64,32}%>");
+#endif
+          opts->x_avr_double = 32;
+        }
+      else
+        gcc_unreachable();
+
+#if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
+      opts->x_avr_double = value;
+#endif
+      break; // -mlong-double=
+    }
+
+  return true;
+}
+
+
+#undef TARGET_HANDLE_OPTION
+#define TARGET_HANDLE_OPTION avr_handle_option
+
 #undef TARGET_OPTION_OPTIMIZATION_TABLE
 #define TARGET_OPTION_OPTIMIZATION_TABLE avr_option_optimization_table