[Bug target/50106] [ARM] Wrong code with -march=armv5t -mthumb -Os

[ramana at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50106

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-08-17
                 CC|                            |ramana at gcc dot gnu.org
     Ever Confirmed|0                           |1
      Known to fail|                            |4.6.1, 4.7.0

--- Comment #3 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2011-08-17 
17:19:14 UTC ---
Looks suspiciously similar to PR45070.

Ramana

The patch below *might* fix it - completely untested.

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index fc2fd47..affa7b3 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -21124,7 +21124,7 @@ thumb_unexpanded_epilogue (void)
   if (extra_pop > 0)
     {
       unsigned long extra_mask = (1 << extra_pop) - 1;
-      live_regs_mask |= extra_mask << (size / UNITS_PER_WORD);
+      live_regs_mask |= extra_mask << ((size + 3) / UNITS_PER_WORD);
     }

   /* The prolog may have pushed some high registers to use as