From: Richard Earnshaw <erich@gnu.org>
Date: Mon, 6 Jun 1994 13:14:03 +0000 (+0000)
Subject: (PROMOTE_MODE): Promote HImode integers as signed.
X-Git-Tag: misc/cutover-egcs-0~6496
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c8728721e9f5bb6c95061409a85e9cbb0b3a585;p=thirdparty%2Fgcc.git

(PROMOTE_MODE): Promote HImode integers as signed.

(BYTES_BIG_ENDIAN): Allow target description to override default.
(LOAD_EXTEND_OP): When big-endian, HImode loads are sign extended.

From-SVN: r7447
---

diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index bf5e8d1c67c5..2898ad3348b6 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -168,6 +168,8 @@ extern enum processor_type arm_cpu;
     {					\
       if (MODE == QImode)		\
 	UNSIGNEDP = 1;			\
+      else if (MODE == HImode)		\
+	UNSIGNEDP = 0;			\
       (MODE) = SImode;			\
     }
 
@@ -197,8 +199,13 @@ extern enum processor_type arm_cpu;
    in instructions that operate on numbered bit-fields.  */
 #define BITS_BIG_ENDIAN  0
 
-/* Define this if most significant byte of a word is the lowest numbered.  */
+/* Define this if most significant byte of a word is the lowest numbered.  
+   Most ARM processors are run in little endian mode, but it should now be
+   possible to build the compiler to support big endian code. (Note: This
+   is currently a compiler-build-time option, not a run-time one.  */
+#ifndef BYTES_BIG_ENDIAN
 #define BYTES_BIG_ENDIAN  0
+#endif
 
 /* Define this if most significant word of a multiword number is the lowest
    numbered.  */
@@ -1129,8 +1136,9 @@ do									\
    will either zero-extend or sign-extend.  The value of this macro should
    be the code that says which one of the two operations is implicitly
    done, NIL if none.  */
-#define LOAD_EXTEND_OP(MODE) \
-  ((MODE) == QImode ? ZERO_EXTEND : NIL)
+#define LOAD_EXTEND_OP(MODE)						\
+  ((MODE) == QImode ? ZERO_EXTEND					\
+   : ((BYTES_BIG_ENDIAN && (MODE) == HImode) ? SIGN_EXTEND : NIL))
 
 /* Define this if zero-extension is slow (more than one real instruction).
    On the ARM, it is more than one instruction only if not fetching from