* config/rs6000/rs6000.c (rs6000_machopic_legitimize_pic_address): Use

	an intermediate register for better optimisation.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@73277 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8f40fac..994e63a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2003-11-05  Geoffrey Keating  <geoffk@apple.com>
+
+       * config/rs6000/rs6000.c (rs6000_machopic_legitimize_pic_address): Use
+       an intermediate register for better optimisation.
+
 2003-11-05  Zdenek Dvorak  <rakdver@atrey.karlin.mff.cuni.cz>
 
        * cfgloopanal.c (variable_initial_value, variable_initial_values,

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index f2bc8d5..14de352 100644 (file)
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -14787,9 +14787,13 @@ rs6000_machopic_legitimize_pic_address (rtx orig, enum machine_mode mode,
 
       if (GET_CODE (XEXP (orig, 0)) == PLUS)
        {
+         /* Use a different reg for the intermediate value, as
+            it will be marked UNCHANGING. */
+         rtx reg_temp = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
+
          base =
            rs6000_machopic_legitimize_pic_address (XEXP (XEXP (orig, 0), 0),
-                                                   Pmode, reg);
+                                                   Pmode, reg_temp);
          offset =
            rs6000_machopic_legitimize_pic_address (XEXP (XEXP (orig, 0), 1),
                                                    Pmode, reg);