PR target/30243

* builtins.c (expand_builtin_signbit): Don't take lowpart when register is already smaller or equal to required mode.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@136376 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 96de8a0..d1930ad 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2008-06-04  Andy Hutchinson  <hutchinsonandy@aim.com>
+
+       PR target/30243
+       * builtins.c (expand_builtin_signbit): Don't take lowpart when
+       register is already smaller or equal to required mode. 
+
 2008-06-04  Xinliang David Li  <davidxl@google.com>
 
        * tree-call-cdce.c: New file. 

diff --git a/gcc/builtins.c b/gcc/builtins.c
index 05eb6bb..f2c6ed4 100644 (file)
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -5786,7 +5786,7 @@ expand_builtin_signbit (tree exp, rtx target)
          lo = 0;
        }
 
-      if (imode != rmode)
+      if (GET_MODE_SIZE (imode) > GET_MODE_SIZE (rmode))
        temp = gen_lowpart (rmode, temp);
       temp = expand_binop (rmode, and_optab, temp,
                           immed_double_const (lo, hi, rmode),