From: Daniel Cederman <cederman@gaisler.com>
Date: Mon, 28 Sep 2015 05:30:31 +0000 (+0000)
Subject: Make muser-mode the default for LEON3
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a01a33a2dde5c0a69563431f3057621a2e74c62a;p=gcc.git

Make muser-mode the default for LEON3

2015-09-28  Daniel Cederman  <cederman@gaisler.com>

Make muser-mode the default for LEON3

The muser-mode flag causes the CASA instruction for LEON3 to use the
user mode ASI. This is the correct behavior for almost all LEON3 targets.
For this reason it makes sense to make user mode the default.

gcc/
	* config/sparc/sparc.opt: Rename mask from USER_MODE to SV_MODE
	  and make it inverse to change default
	* config/sparc/sync.md: Only use supervisor ASI for CASA when in
	  supervisor mode
	* doc/invoke.texi: Document change of default

From-SVN: r228184
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6eb3032aeef..7fb87ea2cb9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2015-09-28  Daniel Cederman  <cederman@gaisler.com>
+
+	* config/sparc/sparc.opt: Rename mask from USER_MODE to SV_MODE
+	  and make it inverse to change default
+	* config/sparc/sync.md: Only use supervisor ASI for CASA when in
+	  supervisor mode
+	* doc/invoke.texi: Document change of default
+
 2015-09-28  Daniel Cederman  <cederman@gaisler.com>
 
 	* config/sparc/sparc.c (sparc_function_value_regno_p): Do not return
diff --git a/gcc/config/sparc/sparc.opt b/gcc/config/sparc/sparc.opt
index 93d24a69be3..85bf0bdb493 100644
--- a/gcc/config/sparc/sparc.opt
+++ b/gcc/config/sparc/sparc.opt
@@ -114,8 +114,8 @@ Target
 Optimize tail call instructions in assembler and linker
 
 muser-mode
-Target Report Mask(USER_MODE)
-Do not generate code that can only run in supervisor mode
+Target Report InverseMask(SV_MODE)
+Do not generate code that can only run in supervisor mode (default)
 
 mcpu=
 Target RejectNegative Joined Var(sparc_cpu_and_features) Enum(sparc_processor_type) Init(PROCESSOR_V7)
diff --git a/gcc/config/sparc/sync.md b/gcc/config/sparc/sync.md
index 7d00b1080b4..2fabff5f67f 100644
--- a/gcc/config/sparc/sync.md
+++ b/gcc/config/sparc/sync.md
@@ -222,10 +222,10 @@
 	  UNSPECV_CAS))]
   "TARGET_LEON3"
 {
-  if (TARGET_USER_MODE)
-    return "casa\t%1 0xa, %2, %0"; /* ASI for user data space.  */
-  else
+  if (TARGET_SV_MODE)
     return "casa\t%1 0xb, %2, %0"; /* ASI for supervisor data space.  */
+  else
+    return "casa\t%1 0xa, %2, %0"; /* ASI for user data space.  */
 }
   [(set_attr "type" "multi")])
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 407eb8e8fa1..50cc52010ff 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -21299,8 +21299,8 @@ in a performance loss, especially for floating-point code.
 @opindex muser-mode
 @opindex mno-user-mode
 Do not generate code that can only run in supervisor mode.  This is relevant
-only for the @code{casa} instruction emitted for the LEON3 processor.  The
-default is @option{-mno-user-mode}.
+only for the @code{casa} instruction emitted for the LEON3 processor.  This
+is the default.
 
 @item -mno-faster-structs
 @itemx -mfaster-structs