From: Mark Mitchell <mark@codesourcery.com>
Date: Mon, 14 May 2001 07:56:57 +0000 (+0000)
Subject: regrename.c (regrename_optimize): Do not rename registers to leaf registers.
X-Git-Tag: prereleases/libstdc++-3.0.95~4480
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b2a8b02619c3d68a0e4b24dbe24d02a28eaeb9c3;p=thirdparty%2Fgcc.git

regrename.c (regrename_optimize): Do not rename registers to leaf registers.

	* regrename.c (regrename_optimize): Do not rename registers to
	leaf registers.

From-SVN: r42066
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b5937f0a0055..2ab87036652a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-05-14  Mark Mitchell  <mark@codesourcery.com>
+
+	* regrename.c (regrename_optimize): Do not rename registers to
+	leaf registers.
+
 2001-05-14  Alexandre Oliva  <aoliva@redhat.com>
 
 	* rtl.texi (CALL_INSN_FUNCTION_USAGE): Note that (and when) it may
diff --git a/gcc/regrename.c b/gcc/regrename.c
index ae25e2171fb8..bad6624f59d0 100644
--- a/gcc/regrename.c
+++ b/gcc/regrename.c
@@ -292,6 +292,12 @@ regrename_optimize ()
 		    /* Can't use regs which aren't saved by the prologue.  */
 		    || (! regs_ever_live[new_reg + i]
 			&& ! call_used_regs[new_reg + i])
+#ifdef LEAF_REGISTERS
+		    /* We can't use a non-leaf register if we're in a 
+		       leaf function.  */
+		    || (current_function_is_leaf 
+			&& !LEAF_REGISTERS[new_reg + i])
+#endif
 #ifdef HARD_REGNO_RENAME_OK
 		    || ! HARD_REGNO_RENAME_OK (reg + i, new_reg + i)
 #endif