i386.c (ix86_compute_frame_layout): Recompute fast prologues only when amount of...

	* i386.c (ix86_compute_frame_layout): Recompute fast prologues
	only when amount of saved regs changed.
	(ix86_init_machine_status): Initialize use_fast_prologue_epilgoue_nregs.
	* i386.h (machine_function): New fields use_fast_prologue_epilgoue_nregs.

From-SVN: r64682

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e8045ca4ad6815dc1522bdb6076e0927cf9bb677..29d1c3c17e01f9ce8cc73cae57d852a0be9ddaea 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+Fri Mar 21 23:12:33 CET 2003  Jan Hubicka  <jh@suse.cz>
+
+       * i386.c (ix86_compute_frame_layout): Recompute fast prologues
+       only when amount of saved regs changed.
+       (ix86_init_machine_status): Initialize use_fast_prologue_epilgoue_nregs.
+       * i386.h (machine_function): New fields use_fast_prologue_epilgoue_nregs.
+
 Fri Mar 21 22:44:33 CET 2003  Jan Hubicka  <jh@suse.cz>
 
        PR inline-asm/7916

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 5959a91fb532bd690e92b92957dc82ce07322028..8097c61b6fd294b5f7104bc35ec55e9b22fddd72 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -4914,10 +4914,16 @@ ix86_compute_frame_layout (frame)
   frame->nregs = ix86_nsaved_regs ();
   total_size = size;
 
-  if (!optimize_size && !reload_completed)
+  /* During reload iteration the amount of registers saved can change.
+     Recompute the value as needed.  Do not recompute when amount of registers
+     didn't change as reload does mutiple calls to the function and does not
+     expect the decision to change within single iteration.  */
+  if (!optimize_size
+      && cfun->machine->use_fast_prologue_epilogue_nregs != frame->nregs)
     {
       int count = frame->nregs;
 
+      cfun->machine->use_fast_prologue_epilogue_nregs = count;
       /* The fast prologue uses move instead of push to save registers.  This
          is significantly longer, but also executes faster as modern hardware
          can execute the moves in parallel, but can't do that for push/pop.
@@ -11784,7 +11790,10 @@ ix86_expand_call (retval, fnaddr, callarg1, callarg2, pop, sibcall)
 static struct machine_function *
 ix86_init_machine_status ()
 {
-  return ggc_alloc_cleared (sizeof (struct machine_function));
+  struct machine_function *f;
+
+  f = ggc_alloc_cleared (sizeof (struct machine_function));
+  f->use_fast_prologue_epilogue_nregs = -1;
 }
 
 /* Return a MEM corresponding to a stack slot with mode MODE.

diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index ce666221bf9a6cdc106e8d80096addd34151522f..8677875944b7fe9e8ba161f1a0cd2534e5791425 100644 (file)
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -3223,6 +3223,9 @@ struct machine_function GTY(())
   /* Set by ix86_compute_frame_layout and used by prologue/epilogue expander to
      determine the style used.  */
   int use_fast_prologue_epilogue;
+  /* Number of saved registers USE_FAST_PROLOGUE_EPILOGUE has been computed
+     for.  */
+  int use_fast_prologue_epilogue_nregs;
 };
 
 #define ix86_stack_locals (cfun->machine->stack_locals)