From 150cdc9e16e86173fe7116e12dbcc4cc8fb6b789 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@redhat.com>
Date: Wed, 2 Nov 2005 17:40:33 -0800
Subject: re PR target/9350 (-fomit-frame-pointer does not work for main)

        PR target/9350
        PR target/24374
        * dwarf2out.c (dwarf2out_reg_save_reg): New.
        (dwarf2out_frame_debug_expr): Return after dwarf_handle_frame_unspec.
        * function.c (assign_parms): Use calls.internal_arg_pointer.
        (expand_main_function): Remove FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
        code.
        * target-def.h (TARGET_INTERNAL_ARG_POINTER): New.
        (TARGET_CALLS): Add it.
        * target.h (struct gcc_target): Add calls.internal_arg_pointer.
        * targhooks.c (default_internal_arg_pointer): New.
        * targhooks.h (default_internal_arg_pointer): Declare.
        * tree.h (dwarf2out_reg_save_reg): Declare.
        * doc/tm.texi (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN): Remove.
        * config/i386/i386.c (dbx_register_map): Add return column.
        (dbx64_register_map, svr4_dbx_register_map): Likewise.
        (TARGET_INTERNAL_ARG_POINTER, ix86_internal_arg_pointer): New.
        (TARGET_DWARF_HANDLE_FRAME_UNSPEC, ix86_dwarf_handle_frame_unspec): New.        (ix86_function_ok_for_sibcall): Disable if force_align_arg_pointer.
        (ix86_save_reg): Save force_align_arg_pointer.
        (ix86_emit_save_regs): Make regno unsigned.
        (ix86_emit_save_regs_using_mov): Likewise.
        (ix86_expand_prologue): Handle force_align_arg_pointer.
        (ix86_expand_epilogue): Likewise.
        * config/i386/i386.h: (dbx_register_map): Update.
        (dbx64_register_map, svr4_dbx_register_map): Update.
        (struct machine_function): Add force_align_arg_pointer.
        * config/i386/i386.md (UNSPEC_REG_SAVE, UNSPEC_DEF_CFA): New.
        (UNSPEC_TP, UNSPEC_TLS_GD, UNSPEC_TLS_LD_BASE): Renumber.
        (TARGET_PUSH_MEMORY peepholes): Disable if RTX_FRAME_RELATED_P.

From-SVN: r106420
---
 gcc/dwarf2out.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

(limited to 'gcc/dwarf2out.c')

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index d780914..314652b 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -1271,6 +1271,30 @@ clobbers_queued_reg_save (rtx insn)
   return false;
 }
 
+/* Entry point for saving the first register into the second.  */
+
+void
+dwarf2out_reg_save_reg (const char *label, rtx reg, rtx sreg)
+{
+  size_t i;
+  unsigned int regno, sregno;
+
+  for (i = 0; i < num_regs_saved_in_regs; i++)
+    if (REGNO (regs_saved_in_regs[i].orig_reg) == REGNO (reg))
+      break;
+  if (i == num_regs_saved_in_regs)
+    {
+      gcc_assert (i != ARRAY_SIZE (regs_saved_in_regs));
+      num_regs_saved_in_regs++;
+    }
+  regs_saved_in_regs[i].orig_reg = reg;
+  regs_saved_in_regs[i].saved_in_reg = sreg;
+
+  regno = DWARF_FRAME_REGNUM (REGNO (reg));
+  sregno = DWARF_FRAME_REGNUM (REGNO (sreg));
+  reg_save (label, regno, sregno, 0);
+}
+
 /* What register, if any, is currently saved in REG?  */
 
 static rtx
@@ -1659,7 +1683,7 @@ dwarf2out_frame_debug_expr (rtx expr, const char *label)
 	case UNSPEC_VOLATILE:
 	  gcc_assert (targetm.dwarf_handle_frame_unspec);
 	  targetm.dwarf_handle_frame_unspec (label, expr, XINT (src, 1));
-	  break;
+	  return;
 
 	default:
 	  gcc_unreachable ();
-- 
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