From: aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 13 Dec 2000 21:24:03 +0000 (+0000)
Subject: * function.c (assign_parms): Optimize incoming PARALLELs into
X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=commitdiff_plain;h=4d6c855d3cd9b2c5c800e51d3f4ee4867b3bb081

* function.c (assign_parms): Optimize incoming PARALLELs into
REGs if possible.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@38233 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 79fa00c92d7..b3051b6df24 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2000-12-13  Alexandre Oliva  <aoliva@redhat.com>
+
+	* function.c (assign_parms): Optimize incoming PARALLELs into
+	REGs if possible.
+
 2000-12-13  Bruce Korb  <bkorb@gnu.org>
 
 	* fixinc/Makefile.in(*): substantial rewrite to accommodate systems
diff --git a/gcc/function.c b/gcc/function.c
index 5e01c65f5d1..07992162067 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -4549,6 +4549,26 @@ assign_parms (fndecl)
 	  && nominal_mode != BLKmode && nominal_mode != passed_mode)
 	stack_parm = 0;
 
+      /* When an argument is passed in multiple locations, we can't
+	 make use of this information, but we can save some copying if
+	 the whole argument is passed in a single register.  */
+      if (GET_CODE (entry_parm) == PARALLEL
+	  && nominal_mode != BLKmode && passed_mode != BLKmode)
+	{
+	  int i, len = XVECLEN (entry_parm, 0);
+
+	  for (i = 0; i < len; i++)
+	    if (XEXP (XVECEXP (entry_parm, 0, i), 0) != NULL_RTX
+		&& GET_CODE (XEXP (XVECEXP (entry_parm, 0, i), 0)) == REG
+		&& (GET_MODE (XEXP (XVECEXP (entry_parm, 0, i), 0))
+		    == passed_mode)
+		&& XINT (XEXP (XVECEXP (entry_parm, 0, i), 1), 0) == 0)
+	      {
+		entry_parm = XEXP (XVECEXP (entry_parm, 0, i), 0);
+		break;
+	      }
+	}
+
       /* ENTRY_PARM is an RTX for the parameter as it arrives,
 	 in the mode in which it arrives.
 	 STACK_PARM is an RTX for a stack slot where the parameter can live