[ARM 1/5 big.LITTLE] Add driver support for rewriting -mcpu names

gcc/
	* common/config/arm/arm-common.c (arm_rewrite_selected_cpu): New.
	(arm_rewrite_mcpu): Likewise.
	* config/arm/arm-protos.h (arm_rewrite_selected_cpu): New.
	* config/arm/arm.h (BIG_LITTLE_SPEC): New.
	(BIG_LITTLE_SPEC_FUNCTIONS): Likewise.
	(EXTRA_SPEC_FUNCTIONS): Include BIG_LITTLE_SPEC_FUNCTIONS.
	(ASM_CPU_SPEC): Include BIG_LITTLE_SPEC.
	* config/arm/arm.c (arm_file_start): Rewrite arm_selecetd_cpu values.

From-SVN: r206045

5 files changed, 66 insertions, 3 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3bd3247..841cd85 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,14 @@
+2013-12-17  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* common/config/arm/arm-common.c (arm_rewrite_selected_cpu): New.
+	(arm_rewrite_mcpu): Likewise.
+	* config/arm/arm-protos.h (arm_rewrite_selected_cpu): New.
+	* config/arm/arm.h (BIG_LITTLE_SPEC): New.
+	(BIG_LITTLE_SPEC_FUNCTIONS): Likewise.
+	(EXTRA_SPEC_FUNCTIONS): Include BIG_LITTLE_SPEC_FUNCTIONS.
+	(ASM_CPU_SPEC): Include BIG_LITTLE_SPEC.
+	* config/arm/arm.c (arm_file_start): Rewrite arm_selecetd_cpu values.
+
 2013-12-17  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* expmed.c (lowpart_bit_field_p): Fix comment.
diff --git a/gcc/common/config/arm/arm-common.c b/gcc/common/config/arm/arm-common.c
index c43a2ce..87f18ec 100644
--- a/gcc/common/config/arm/arm-common.c
+++ b/gcc/common/config/arm/arm-common.c
@@ -63,6 +63,41 @@ arm_except_unwind_info (struct gcc_options *opts)
   return UI_SJLJ;
 }
 
+#define ARM_CPU_NAME_LENGTH 20
+
+/* Truncate NAME at the first '.' character seen, or return
+   NAME unmodified.  */
+
+const char *
+arm_rewrite_selected_cpu (const char *name)
+{
+  static char output_buf[ARM_CPU_NAME_LENGTH + 1] = {0};
+  char *arg_pos;
+
+  strncpy (output_buf, name, ARM_CPU_NAME_LENGTH);
+  arg_pos = strchr (output_buf, '.');
+
+  /* If we found a '.' truncate the entry at that point.  */
+  if (arg_pos)
+    *arg_pos = '\0';
+
+  return output_buf;
+}
+
+/* Called by the driver to rewrite a name passed to the -mcpu
+   argument in preparation to be passed to the assembler.  The
+   name will be in ARGV[0], ARGC should always be 1.  */
+
+const char *
+arm_rewrite_mcpu (int argc, const char **argv)
+{
+  gcc_assert (argc == 1);
+  return arm_rewrite_selected_cpu (argv[0]);
+}
+
+#undef ARM_CPU_NAME_LENGTH
+
+
 #undef  TARGET_DEFAULT_TARGET_FLAGS
 #define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT | MASK_SCHED_PROLOG)
 
diff --git a/gcc/config/arm/arm-protos.h b/gcc/config/arm/arm-protos.h
index c5b16da..558f134 100644
--- a/gcc/config/arm/arm-protos.h
+++ b/gcc/config/arm/arm-protos.h
@@ -289,4 +289,7 @@ extern bool arm_autoinc_modes_ok_p (enum machine_mode, enum arm_auto_incmodes);
 
 extern void arm_emit_eabi_attribute (const char *, int, int);
 
+/* Defined in gcc/common/config/arm-common.c.  */
+extern const char *arm_rewrite_selected_cpu (const char *name);
+
 #endif /* ! GCC_ARM_PROTOS_H */
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 7027a26..a4ab6be 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -27527,7 +27527,11 @@ arm_file_start (void)
       else if (strncmp (arm_selected_cpu->name, "generic", 7) == 0)
 	asm_fprintf (asm_out_file, "\t.arch %s\n", arm_selected_cpu->name + 8);
       else
-	asm_fprintf (asm_out_file, "\t.cpu %s\n", arm_selected_cpu->name);
+	{
+	  const char* truncated_name
+	    = arm_rewrite_selected_cpu (arm_selected_cpu->name);
+	  asm_fprintf (asm_out_file, "\t.cpu %s\n", truncated_name);
+	}
 
       if (TARGET_SOFT_FLOAT)
 	{
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 8b8b80e..6539ec6 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -2343,16 +2343,25 @@ extern int making_const_table;
    instruction.  */
 #define MAX_LDM_STM_OPS 4
 
+#define BIG_LITTLE_SPEC \
+   " %{mcpu=*:%<mcpu=* -mcpu=%:rewrite_mcpu(%{mcpu=*:%*})}" \
+
+extern const char *arm_rewrite_mcpu (int argc, const char **argv);
+#define BIG_LITTLE_CPU_SPEC_FUNCTIONS \
+  { "rewrite_mcpu", arm_rewrite_mcpu },
+
 #define ASM_CPU_SPEC \
    " %{mcpu=generic-*:-march=%*;"				\
-   "   :%{mcpu=*:-mcpu=%*} %{march=*:-march=%*}}"
+   "   :%{march=*:-march=%*}}"					\
+   BIG_LITTLE_SPEC
 
 /* -mcpu=native handling only makes sense with compiler running on
    an ARM chip.  */
 #if defined(__arm__)
 extern const char *host_detect_local_cpu (int argc, const char **argv);
 # define EXTRA_SPEC_FUNCTIONS						\
-  { "local_cpu_detect", host_detect_local_cpu },
+  { "local_cpu_detect", host_detect_local_cpu },			\
+  BIG_LITTLE_CPU_SPEC_FUNCTIONS
 
 # define MCPU_MTUNE_NATIVE_SPECS					\
    " %{march=native:%<march=native %:local_cpu_detect(arch)}"		\
@@ -2360,6 +2369,7 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
    " %{mtune=native:%<mtune=native %:local_cpu_detect(tune)}"
 #else
 # define MCPU_MTUNE_NATIVE_SPECS ""
+# define EXTRA_SPEC_FUNCTIONS BIG_LITTLE_CPU_SPEC_FUNCTIONS
 #endif
 
 #define DRIVER_SELF_SPECS MCPU_MTUNE_NATIVE_SPECS