* config/c4x/c4x.h (CALLER_SAVE_PROFITABLE): Disable.

This has been disabled since caller-save has marginal benefit on the c3x/c4x
and it avoids a long standing caller-save bug.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@29112 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 326147a..e765fac 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Sun Sep  5 10:13:19 1999  Michael Hayes  <m.hayes@elec.canterbury.ac.nz>
+
+       * config/c4x/c4x.h (CALLER_SAVE_PROFITABLE): Disable.
+
 Sat Sep  4 13:44:01 1999  Mark Mitchell  <mark@codesourcery.com>
 
        * Makefile.in (C_AND_C_OBJS): Add gcc-callbacks.o.

diff --git a/gcc/config/c4x/c4x.h b/gcc/config/c4x/c4x.h
index 14b0133..3f106f0 100644 (file)
--- a/gcc/config/c4x/c4x.h
+++ b/gcc/config/c4x/c4x.h
@@ -1086,11 +1086,11 @@ extern struct rtx_def *c4x_function_arg();
   (c4x_function_arg(&CUM, MODE, TYPE, NAMED))
 
 /* Define the profitability of saving registers around calls.
-   NOTE: For now we turn this off because caller-save assumes
-   that a register with a QFmode quantity can be saved/restored
-   using QImode.  */
+   We disable caller save to avoid a bug in flow.c (this also affects
+   other targets such as m68k).  Since we must use stf/sti,
+   the profitability is marginal anyway.  */
 
-/* #define CALLER_SAVE_PROFITABLE(REFS,CALLS) 0 */
+#define CALLER_SAVE_PROFITABLE(REFS,CALLS) 0
 
 /* Never pass data by reference.  */