PATCH [6/n]: Prepare x32: PR rtl-optimization/47449: Don't propagate hard register non-local goto save area

[H.J. Lu]

Hi,

RTL-based forward propagation pass shouldn't propagate hard register.
OK for trunk?

Thanks.


H.J.
---
2011-06-14  H.J. Lu  <hongjiu...@intel.com>

        PR rtl-optimization/47449
        * fwprop.c (forward_propagate_subreg): Don't propagate hard
        register nor zero/sign extended hard register.

diff --git a/gcc/fwprop.c b/gcc/fwprop.c
index b2fd955..c8009d0 100644
--- a/gcc/fwprop.c
+++ b/gcc/fwprop.c
@@ -1101,6 +1101,7 @@ forward_propagate_subreg (df_ref use, rtx def_insn, rtx 
def_set)
       src = SET_SRC (def_set);
       if (GET_CODE (src) == SUBREG
          && REG_P (SUBREG_REG (src))
+         && REGNO (SUBREG_REG (src)) >= FIRST_PSEUDO_REGISTER
          && GET_MODE (SUBREG_REG (src)) == use_mode
          && subreg_lowpart_p (src)
          && all_uses_available_at (def_insn, use_insn))
@@ -1119,6 +1120,7 @@ forward_propagate_subreg (df_ref use, rtx def_insn, rtx 
def_set)
       if ((GET_CODE (src) == ZERO_EXTEND
           || GET_CODE (src) == SIGN_EXTEND)
          && REG_P (XEXP (src, 0))
+         && REGNO (XEXP (src, 0)) >= FIRST_PSEUDO_REGISTER
          && GET_MODE (XEXP (src, 0)) == use_mode
          && !free_load_extend (src, def_insn)
          && all_uses_available_at (def_insn, use_insn))