From: Ian Lance Taylor <iant@google.com>
Date: Wed, 6 Nov 2013 01:03:57 +0000 (+0000)
Subject: sync.md (atomic_compare_and_swap<dwi>_doubleword): If possible, add .cfi directives... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=674647e60381fe980fda563eea96e0536150057d;hp=39cf09b1f55b630ee462edce769bf8e9562ef74a;p=gcc.git

sync.md (atomic_compare_and_swap<dwi>_doubleword): If possible, add .cfi directives to record change to bx.

	* config/i386/sync.md (atomic_compare_and_swap<dwi>_doubleword):
	If possible, add .cfi directives to record change to bx.
	* config/i386/i386.c (ix86_emit_cfi): New function.
	* config/i386/i386-protos.h (ix86_emit_cfi): Declare.

From-SVN: r204433
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2727156ca8d..d5c8ceb1c5e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2013-11-05  Ian Lance Taylor  <iant@google.com>
+
+	* config/i386/sync.md (atomic_compare_and_swap<dwi>_doubleword):
+	If possible, add .cfi directives to record change to bx.
+	* config/i386/i386.c (ix86_emit_cfi): New function.
+	* config/i386/i386-protos.h (ix86_emit_cfi): Declare.
+
 2013-11-05  Steven Bosscher  <steven@gcc.gnu.org>
 
 
diff --git a/gcc/config/i386/i386-protos.h b/gcc/config/i386/i386-protos.h
index 5799251404b..fdf9d5804df 100644
--- a/gcc/config/i386/i386-protos.h
+++ b/gcc/config/i386/i386-protos.h
@@ -143,6 +143,7 @@ extern void ix86_split_lshr (rtx *, rtx, enum machine_mode);
 extern rtx ix86_find_base_term (rtx);
 extern bool ix86_check_movabs (rtx, int);
 extern void ix86_split_idivmod (enum machine_mode, rtx[], bool);
+extern bool ix86_emit_cfi ();
 
 extern rtx assign_386_stack_local (enum machine_mode, enum ix86_stack_slot);
 extern int ix86_attr_length_immediate_default (rtx, bool);
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 771fabe6dc5..3d3838b97f9 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -17344,6 +17344,14 @@ ix86_split_idivmod (enum machine_mode mode, rtx operands[],
   emit_label (end_label);
 }
 
+/* Whether it is OK to emit CFI directives when emitting asm code.  */
+
+bool
+ix86_emit_cfi ()
+{
+  return dwarf2out_do_cfi_asm ();
+}
+
 #define LEA_MAX_STALL (3)
 #define LEA_SEARCH_THRESHOLD (LEA_MAX_STALL << 1)
 
diff --git a/gcc/config/i386/sync.md b/gcc/config/i386/sync.md
index 9e5835662e1..8408a2bfe43 100644
--- a/gcc/config/i386/sync.md
+++ b/gcc/config/i386/sync.md
@@ -430,10 +430,21 @@
   const char *xchg = "xchg{<imodesuffix>}\t%%<regprefix>bx, %5";
 
   if (swap)
-    output_asm_insn (xchg, operands);
+    {
+      output_asm_insn (xchg, operands);
+      if (ix86_emit_cfi ())
+	{
+	  output_asm_insn (".cfi_remember_state", operands);
+	  output_asm_insn (".cfi_register\t%%<regprefix>bx, %5", operands);
+	}
+    }
   output_asm_insn ("lock{%;} %K7cmpxchg<doublemodesuffix>b\t%2", operands);
   if (swap)
-    output_asm_insn (xchg, operands);
+    {
+      output_asm_insn (xchg, operands);
+      if (ix86_emit_cfi ())
+	output_asm_insn (".cfi_restore_state", operands);
+    }
 
   return "";
 })