From f474c6f8f92594e09a56c03cdd609d161e690bdd Mon Sep 17 00:00:00 2001
From: Alexandre Oliva <aoliva@redhat.com>
Date: Fri, 12 Jan 2001 21:58:56 +0000
Subject: calls.c (emit_library_call_value_1): Add USEs and CLOBBERs to
 function usage for arguments passed by reference.

* calls.c (emit_library_call_value_1): Add USEs and CLOBBERs
to function usage for arguments passed by reference.  Optimize
callee-copied arguments.
* regmove.c (find_related_toplev): Find uses in function usage.
(replace_in_call_usage): New function.
(fixup_match_1): Call it.
* cse.c (cse_insn): Canonicalize registers in function usage.
* reload1.c (replace_pseudos_in_call_usage): New function.
(reload): Call it.

From-SVN: r38964
---
 gcc/reload1.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

(limited to 'gcc/reload1.c')

diff --git a/gcc/reload1.c b/gcc/reload1.c
index 805fd96..ace38ef 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -577,6 +577,63 @@ compute_use_by_pseudos (to, from)
 	 }
      });
 }
+
+/* Replace all pseudos found in LOC with their corresponding
+   equivalences.  */
+
+static void
+replace_pseudos_in_call_usage (loc, mem_mode, usage)
+     rtx *loc;
+     enum machine_mode mem_mode;
+     rtx usage;
+{
+  rtx x = *loc;
+  enum rtx_code code;
+  const char *fmt;
+  int i, j;
+
+  if (! x)
+    return;
+  
+  code = GET_CODE (x);
+  if (code == REG)
+    {
+      if (REGNO (x) < FIRST_PSEUDO_REGISTER)
+	return;
+
+      x = eliminate_regs (x, mem_mode, usage);
+      if (x != *loc)
+	{
+	  *loc = x;
+	  replace_pseudos_in_call_usage (loc, mem_mode, usage);
+	  return;
+	}
+
+      if (reg_renumber [REGNO (x)] < 0)
+	*loc = regno_reg_rtx[REGNO (x)];
+      else if (reg_equiv_mem[REGNO (x)])
+	*loc = reg_equiv_mem[REGNO (x)];
+      else
+	abort ();
+
+      return;
+    }
+  else if (code == MEM)
+    {
+      replace_pseudos_in_call_usage (& XEXP (x, 0), GET_MODE (x), usage);
+      return;
+    }
+  
+  /* Process each of our operands recursively.  */
+  fmt = GET_RTX_FORMAT (code);
+  for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++)
+    if (*fmt == 'e')
+      replace_pseudos_in_call_usage (&XEXP (x, i), mem_mode, usage);
+    else if (*fmt == 'E')
+      for (j = 0; j < XVECLEN (x, i); j++)
+	replace_pseudos_in_call_usage (& XVECEXP (x, i, j), mem_mode, usage);
+}
+
 
 /* Global variables used by reload and its subroutines.  */
 
@@ -1114,6 +1171,11 @@ reload (first, global)
       {
 	rtx *pnote;
 
+	if (GET_CODE (insn) == CALL_INSN)
+	  replace_pseudos_in_call_usage (& CALL_INSN_FUNCTION_USAGE (insn),
+					 VOIDmode,
+					 CALL_INSN_FUNCTION_USAGE (insn));
+
 	if ((GET_CODE (PATTERN (insn)) == USE
 	     && find_reg_note (insn, REG_EQUAL, NULL_RTX))
 	    || (GET_CODE (PATTERN (insn)) == CLOBBER
-- 
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