Add fast interrupt.

	*  config/microblaze/microblaze-protos.h: Rename
	microblaze_is_interrupt_handler to microblaze_is_interrupt_variant.
	*  config/microblaze/microblaze.c (microblaze_attribute_table): Add
	fast_interrupt.
	(microblaze_fast_interrupt_function_p): New function.
	(microblaze_is_interrupt_handler): Rename to
	microblaze_is_interrupt_variant and add fast_interrupt check.
	(microblaze_must_save_register): Use microblaze_is_interrupt_variant.
	(save_restore_insns): Likewise.
	(compute_frame_size): Likewise.
	(microblaze_function_prologue): Add FAST_INTERRUPT_NAME.
	(microblaze_globalize_label): Likewise.
	*  config/microblaze/microblaze.h: Define FAST_INTERRUPT_NAME.
	*  config/microblaze/microblaze.md: Use wrapper
	microblaze_is_interrupt_variant.




git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@196474 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 40 insertions, 16 deletions

diff --git a/gcc/config/microblaze/microblaze.c b/gcc/config/microblaze/microblaze.c
index 5286316e0ce..3a5299410b9 100644
--- a/gcc/config/microblaze/microblaze.c
+++ b/gcc/config/microblaze/microblaze.c
@@ -195,6 +195,7 @@ enum reg_class microblaze_regno_to_class[] =
 		       and epilogue and use appropriate interrupt return.
    save_volatiles    - Similar to interrupt handler, but use normal return.  */
 int interrupt_handler;
+int fast_interrupt;
 int save_volatiles;
 
 const struct attribute_spec microblaze_attribute_table[] = {
@@ -202,6 +203,8 @@ const struct attribute_spec microblaze_attribute_table[] = {
      affects_type_identity */
   {"interrupt_handler", 0,       0,     true,    false,   false,        NULL,
     false },
+  {"fast_interrupt",    0,       0,     true,    false,   false,        NULL,
+    false },
   {"save_volatiles"   , 0,       0,     true,    false,   false,        NULL,
     false },
   { NULL,        	0,       0,    false,    false,   false,        NULL,
@@ -1506,6 +1509,18 @@ microblaze_interrupt_function_p (tree func)
   return a != NULL_TREE;
 }
 
+static int
+microblaze_fast_interrupt_function_p (tree func)
+{
+  tree a;
+
+  if (TREE_CODE (func) != FUNCTION_DECL)
+    return 0;
+
+  a = lookup_attribute ("fast_interrupt", DECL_ATTRIBUTES (func));
+  return a != NULL_TREE;
+}
+
 /* Return true if FUNC is an interrupt function which uses
    normal return, indicated by the "save_volatiles" attribute.  */
 
@@ -1522,12 +1537,13 @@ microblaze_save_volatiles (tree func)
 }
 
 /* Return whether function is tagged with 'interrupt_handler'
-   attribute.  Return true if function should use return from
-   interrupt rather than normal function return.  */
+   or 'fast_interrupt' attribute.  Return true if function
+   should use return from interrupt rather than normal
+   function return.  */
 int
-microblaze_is_interrupt_handler (void)
+microblaze_is_interrupt_variant (void)
 {
-  return interrupt_handler;
+  return (interrupt_handler || fast_interrupt);
 }
 
 /* Determine of register must be saved/restored in call.  */
@@ -1548,17 +1564,18 @@ microblaze_must_save_register (int regno)
     {
       if (regno == MB_ABI_SUB_RETURN_ADDR_REGNUM)
 	return 1;
-      if ((interrupt_handler || save_volatiles) &&
+      if ((microblaze_is_interrupt_variant () || save_volatiles) &&
 	  (regno >= 3 && regno <= 12))
 	return 1;
     }
 
-  if (interrupt_handler)
+  if (microblaze_is_interrupt_variant ())
     {
       if (df_regs_ever_live_p (regno) 
 	  || regno == MB_ABI_MSR_SAVE_REG
-	  || regno == MB_ABI_ASM_TEMP_REGNUM
-	  || regno == MB_ABI_EXCEPTION_RETURN_ADDR_REGNUM)
+	  || (interrupt_handler
+              && (regno == MB_ABI_ASM_TEMP_REGNUM
+	          || regno == MB_ABI_EXCEPTION_RETURN_ADDR_REGNUM)))
 	return 1;
     }
 
@@ -1631,6 +1648,8 @@ compute_frame_size (HOST_WIDE_INT size)
 
   interrupt_handler =
     microblaze_interrupt_function_p (current_function_decl);
+  fast_interrupt =
+    microblaze_fast_interrupt_function_p (current_function_decl);
   save_volatiles = microblaze_save_volatiles (current_function_decl);
 
   gp_reg_size = 0;
@@ -1664,7 +1683,7 @@ compute_frame_size (HOST_WIDE_INT size)
   total_size += gp_reg_size;
 
   /* Add 4 bytes for MSR.  */
-  if (interrupt_handler)
+  if (microblaze_is_interrupt_variant ())
     total_size += 4;
 
   /* No space to be allocated for link register in leaf functions with no other
@@ -2156,7 +2175,7 @@ save_restore_insns (int prologue)
   base_reg_rtx = stack_pointer_rtx;
 
   /* For interrupt_handlers, need to save/restore the MSR.  */
-  if (interrupt_handler)
+  if (microblaze_is_interrupt_variant ())
     {
       isr_mem_rtx = gen_rtx_MEM (SImode,
 				 gen_rtx_PLUS (Pmode, base_reg_rtx,
@@ -2170,7 +2189,7 @@ save_restore_insns (int prologue)
       isr_msr_rtx = gen_rtx_REG (SImode, ST_REG);
     }
 
-  if (interrupt_handler && !prologue)
+  if (microblaze_is_interrupt_variant () && !prologue)
     {
       emit_move_insn (isr_reg_rtx, isr_mem_rtx);
       emit_move_insn (isr_msr_rtx, isr_reg_rtx);
@@ -2190,7 +2209,7 @@ save_restore_insns (int prologue)
 	  reg_rtx = gen_rtx_REG (SImode, regno);
 	  insn = gen_rtx_PLUS (Pmode, base_reg_rtx, GEN_INT (gp_offset));
 	  mem_rtx = gen_rtx_MEM (SImode, insn);
-	  if (interrupt_handler || save_volatiles)
+	  if (microblaze_is_interrupt_variant () || save_volatiles)
 	    /* Do not optimize in flow analysis.  */
 	    MEM_VOLATILE_P (mem_rtx) = 1;
 
@@ -2208,7 +2227,7 @@ save_restore_insns (int prologue)
 	}
     }
 
-  if (interrupt_handler && prologue)
+  if (microblaze_is_interrupt_variant () && prologue)
     {
       emit_move_insn (isr_reg_rtx, isr_msr_rtx);
       emit_move_insn (isr_mem_rtx, isr_reg_rtx);
@@ -2238,10 +2257,12 @@ microblaze_function_prologue (FILE * file, HOST_WIDE_INT size ATTRIBUTE_UNUSED)
       fputs ("\t.ent\t", file);
       if (interrupt_handler && strcmp (INTERRUPT_HANDLER_NAME, fnname))
 	fputs ("_interrupt_handler", file);
+      else if (fast_interrupt && strcmp (FAST_INTERRUPT_NAME, fnname))
+	fputs ("_fast_interrupt", file);
       else
 	assemble_name (file, fnname);
       fputs ("\n", file);
-      if (!interrupt_handler)
+      if (!microblaze_is_interrupt_variant ())
 	ASM_OUTPUT_TYPE_DIRECTIVE (file, fnname, "function");
     }
 
@@ -2593,9 +2614,12 @@ static void
 microblaze_globalize_label (FILE * stream, const char *name)
 {
   fputs ("\t.globl\t", stream);
-  if (interrupt_handler && strcmp (name, INTERRUPT_HANDLER_NAME))
+  if (microblaze_is_interrupt_variant ())
     {
-      fputs (INTERRUPT_HANDLER_NAME, stream);
+      if (interrupt_handler && strcmp (name, INTERRUPT_HANDLER_NAME))
+        fputs (INTERRUPT_HANDLER_NAME, stream);
+      else if (fast_interrupt && strcmp (name, FAST_INTERRUPT_NAME))
+        fputs (FAST_INTERRUPT_NAME, stream);
       fputs ("\n\t.globl\t", stream);
     }
   assemble_name (stream, name);