[14/32] Remove global call sets: DF (entry/exit defs)

[Richard Sandiford]

The code patched here is seeing whether the current function
needs to save at least part of a register before using it.


2019-09-11  Richard Sandiford  <richard.sandif...@arm.com>

gcc/
        * df-scan.c (df_get_entry_block_def_set): Use crtl->abi to test
        whether the current function needs to save at least part of a
        register before using it.
        (df_get_exit_block_use_set): Likewise for epilogue restores.

Index: gcc/df-scan.c
===================================================================
--- gcc/df-scan.c       2019-09-11 19:48:07.405959747 +0100
+++ gcc/df-scan.c       2019-09-11 19:48:11.009934354 +0100
@@ -3499,7 +3499,9 @@ df_get_entry_block_def_set (bitmap entry
       /* Defs for the callee saved registers are inserted so that the
         pushes have some defining location.  */
       for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
-       if ((call_used_or_fixed_reg_p (i) == 0) && (df_regs_ever_live_p (i)))
+       if (!crtl->abi->clobbers_full_reg_p (i)
+           && !fixed_regs[i]
+           && df_regs_ever_live_p (i))
          bitmap_set_bit (entry_block_defs, i);
     }
 
@@ -3672,8 +3674,9 @@ df_get_exit_block_use_set (bitmap exit_b
     {
       /* Mark all call-saved registers that we actually used.  */
       for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
-       if (df_regs_ever_live_p (i) && !LOCAL_REGNO (i)
-           && !TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
+       if (df_regs_ever_live_p (i)
+           && !LOCAL_REGNO (i)
+           && !crtl->abi->clobbers_full_reg_p (i))
          bitmap_set_bit (exit_block_uses, i);
     }