From 331e362574142e4c1d9d509533d1c96b6dc54d13 Mon Sep 17 00:00:00 2001
From: Carrot Wei <carrot@google.com>
Date: Thu, 15 May 2014 10:06:33 +0800
Subject: [4.8, 4.9] Add simplify-got

This pass optimize GOT_PREL (already exists in toolchain/gcc/gcc-4.6)
Backport from svn://gcc.gnu.org/svn/gcc/branches/google/gcc-4_6-mobile
UNSPEC_GOT_PREL_SYM is now in new file arm/unspecs.md
4.9 port is slightly different due to changes in gcc passes
See Google b/14811006

r173209 | carrot | 2011-04-30 16:07:46 +0800 (Sat, 30 Apr 2011) | 21 lines

	* hooks.c (hook_rtx_void_null): New function.
	* hooks.h (hook_rtx_void_null): New prototype.
	* target.def (got_access): New hook vector declaration.
	* tree-pass.h (pass_simplify_got): New pass.
	* timevar.def (TV_SIMPLIFY_GOT): New TV id.
	* simplify-got.c: New source file.
	* Makefile.in (simplify-got.o): Add a new file.
	* passes.c (init_optimization_passes): Add a new pass.
	* config/arm/arm.c (arm_output_addr_const_extra): Output GOT_PREL
	relocation.
	(arm_get_pic_reg): New function.
	(arm_clear_pic_reg): New function.
	(arm_can_simplify_got_access): New function.
	(arm_loaded_global_var): New function.
	(arm_load_global_address): New function.
	* config/arm/arm.md (UNSPEC_GOT_PREL_SYM): New UNSPEC symbol.

	* testsuite/gcc.target/arm/got1.c: New testcase.
	* testsuite/gcc.target/arm/got2.c: New testcase.

Change-Id: I91e881df19bb6937a5fbcc8e6b83d158717c7773
---
 gcc-4.9/gcc/testsuite/gcc.target/arm/got1.c | 10 ++++++++++
 gcc-4.9/gcc/testsuite/gcc.target/arm/got2.c | 11 +++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 gcc-4.9/gcc/testsuite/gcc.target/arm/got1.c
 create mode 100644 gcc-4.9/gcc/testsuite/gcc.target/arm/got2.c

(limited to 'gcc-4.9/gcc/testsuite')

diff --git a/gcc-4.9/gcc/testsuite/gcc.target/arm/got1.c b/gcc-4.9/gcc/testsuite/gcc.target/arm/got1.c
new file mode 100644
index 000000000..46a67fb9b
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.target/arm/got1.c
@@ -0,0 +1,10 @@
+/* { dg-options "-Os -fpic" }  */
+/* { dg-final { scan-assembler "GOT_PREL" } } */
+
+extern int x;
+int foo(int j)
+{
+  int t = x;
+  x = j;
+  return t;
+}
diff --git a/gcc-4.9/gcc/testsuite/gcc.target/arm/got2.c b/gcc-4.9/gcc/testsuite/gcc.target/arm/got2.c
new file mode 100644
index 000000000..725f49e9c
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.target/arm/got2.c
@@ -0,0 +1,11 @@
+/* We should not use GOT_PREL relocation to load global address with so
+   many global accesses.  */
+
+/* { dg-options "-Os -fpic" }  */
+/* { dg-final { scan-assembler-not "GOT_PREL" } } */
+
+extern int x1, x2, x3, x4, x5;
+int sum()
+{
+  return x1 + x2 + x3 + x4 + x5;
+}
-- 
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