PR target/24954

	* config/rs6000/predicated.md (easy_vector_constant_add_self): Use
	explicit sign extension, not a (char) cast.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@107352 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fa6a35c..5bc604e 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2005-11-22  Alan Modra  <amodra@bigpond.net.au>
+
+       PR target/24954
+       * config/rs6000/predicated.md (easy_vector_constant_add_self): Use
+       explicit sign extension, not a (char) cast.
+
 2005-11-22  Ben Elliston  <bje@au.ibm.com>
 
        * optabs.c: Use SCALAR_FLOAT_MODE_P instead of explicitly testing

diff --git a/gcc/config/rs6000/predicates.md b/gcc/config/rs6000/predicates.md
index 885ac2c..b940261 100644 (file)
--- a/gcc/config/rs6000/predicates.md
+++ b/gcc/config/rs6000/predicates.md
@@ -317,7 +317,7 @@
            (match_test "easy_altivec_constant (op, mode)")))
 {
   rtx last = CONST_VECTOR_ELT (op, GET_MODE_NUNITS (mode) - 1);
-  HOST_WIDE_INT val = (char) (INTVAL (last) & 255);
+  HOST_WIDE_INT val = ((INTVAL (last) & 0xff) ^ 0x7f) - 0x7f;
   return EASY_VECTOR_15_ADD_SELF (val);
 })