From: Richard Earnshaw <rearnsha@arm.com>
Date: Fri, 31 Oct 2003 21:42:23 +0000 (+0000)
Subject: arm.h (CONDITIONAL_REGISTER_USAGE): Disable use of LR in Thumb code.
X-Git-Tag: releases/gcc-3.4.0~2571
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fb14bc892cad994c8aa65ea8844f727d22c0c79d;p=thirdparty%2Fgcc.git

arm.h (CONDITIONAL_REGISTER_USAGE): Disable use of LR in Thumb code.

* arm.h (CONDITIONAL_REGISTER_USAGE): Disable use of LR in Thumb
code.

From-SVN: r73157
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e253ebe67d4f..4013338221c3 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2003-10-31  Richard Earnshaw  <rearnsha@arm.com>
+
+	* arm.h (CONDITIONAL_REGISTER_USAGE): Disable use of LR in Thumb
+	code.
+
 2003-10-31  Andreas Jaeger  <aj@suse.de>, 
             Zack Weinberg  <zack@codesourcery.com>            
 
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 0cb1562e636f..e73df85e347c 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -959,6 +959,12 @@ extern const char * structure_size_string;
 	fixed_regs[regno] = call_used_regs[regno] = 1;		\
     }								\
 								\
+  /* The link register can be clobbered by any branch insn,	\
+     but we have no way to track that at present, so mark	\
+     it as unavailable.  */					\
+  if (TARGET_THUMB)						\
+    fixed_regs[LR_REGNUM] = call_used_regs[LR_REGNUM] = 1;	\
+								\
   if (TARGET_CIRRUS)						\
     {								\
       for (regno = FIRST_ARM_FP_REGNUM;				\