From patchwork Wed Nov  7 23:32:49 2012
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Subject: [mips] Do not make -Os the default with mips-mti-elf target.
Date: Wed, 07 Nov 2012 13:32:49 -0000
From: Steve Ellcey <sellcey@mips.com>
X-Patchwork-Id: 197738
Message-Id: <eac1aafa-a6d7-41c9-9ac6-b6abf69ed93b@EXCHHUB01.MIPS.com>
To: <gcc-patches@gcc.gnu.org>

I noticed that because my new mips-mti-elf target includes config/mt-sde
it uses the -Os option by default when building runtime libraries.  I would
like to remove the use of -Os so that the runtime performance for the
mips-mti-elf target is improved.  If users want the -Os flag they can use
the existing --enable-target-optspace configure option to get it.

This patch creates config/mt-mti that is like mt-sde but without -Os and
changes the mips*-mti-elf* target to use that include file instead of mt-sde.

Tested with the mips-mti-elf target.

OK to checkin?

Steve Ellcey
sellcey@mips.com


2012-11-07  Steve Ellcey  <sellcey@mips.com>

	* config/mt-mti: New file.
	* configure.ac (mips*-mti-elf*): Use config/mt-mti.
	* configure: Regenerate.


diff --git a/config/mt-mti b/config/mt-mti
new file mode 100644
index 0000000..85ad9e7
--- /dev/null
+++ b/config/mt-mti
@@ -0,0 +1,13 @@
+# We use -minterlink-mips16 so that the non-MIPS16 libraries can still be
+# linked against partly-MIPS16 code.  The -mcode-readable=pcrel option allows
+# MIPS16 libraries to run on Harvard-style split I/D memories, so long
+# as they have the D-to-I redirect for PC-relative loads.  -mno-gpopt
+# has two purposes: it allows libraries to be used in situations where
+# $gp != our _gp, and it allows them to be built with -G8 while
+# retaining link compatibility with -G0 and -G4.
+#
+# We do not default to -Os like mt-sde does, users who want that can configure
+# with --enable-target-optspace.
+
+CFLAGS_FOR_TARGET += -minterlink-mips16 -mcode-readable=pcrel -mno-gpopt
+CXXFLAGS_FOR_TARGET += -minterlink-mips16 -mcode-readable=pcrel -mno-gpopt
diff --git a/configure.ac b/configure.ac
index c346c2c..a87185a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2299,9 +2299,12 @@ case "${target}" in
   spu-*-*)
     target_makefile_frag="config/mt-spu"
     ;;
-  mips*-sde-elf* | mips*-mti-elf*)
+  mips*-sde-elf*)
     target_makefile_frag="config/mt-sde"
     ;;
+  mips*-mti-elf*)
+    target_makefile_frag="config/mt-mti"
+    ;;
   mipsisa*-*-elfoabi*)
     target_makefile_frag="config/mt-mips-elfoabi"
     ;;