PR middle-end/17151

	* combine.c (force_to_mode): Remove dubious early return test that
	inhibits further optimization.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@88129 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 700cabf..af865b1 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2004-09-26  Roger Sayle  <roger@eyesopen.com>
+
+       PR middle-end/17151
+       * combine.c (force_to_mode): Remove dubious early return test that
+       inhibits further optimization.
+
 2004-09-26  Kazu Hirata  <kazu@cs.umass.edu>
 
        * profile.c: Fix a comment typo.

diff --git a/gcc/combine.c b/gcc/combine.c
index f0b5b06..ad5ec64 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -6904,11 +6904,6 @@ force_to_mode (rtx x, enum machine_mode mode, unsigned HOST_WIDE_INT mask,
       && (GET_MODE_MASK (GET_MODE (x)) & ~mask) == 0)
     return gen_lowpart (mode, x);
 
-  /* If we aren't changing the mode, X is not a SUBREG, and all zero bits in
-     MASK are already known to be zero in X, we need not do anything.  */
-  if (GET_MODE (x) == mode && code != SUBREG && (~mask & nonzero) == 0)
-    return x;
-
   switch (code)
     {
     case CLOBBER: