Remove global call sets: DF (entry/exit defs)

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

2019-09-30  Richard Sandiford  <richard.sandiford@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.

From-SVN: r276320

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 13caa919728916adeb835853e248db6ab6e8a6c6..3617216e58205f368d81e7a5baa0faad49b6bf92 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>
+
+       * 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.
+
 2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>
 
        * df-problems.c: Include regs.h and function-abi.h.

diff --git a/gcc/df-scan.c b/gcc/df-scan.c
index 7dda4cacf7adfec358bbea30a9194cc4825faac0..36012b7b821941b7c0dd703d3abca4cbf01959ac 100644 (file)
--- a/gcc/df-scan.c
+++ b/gcc/df-scan.c
@@ -3499,7 +3499,9 @@ df_get_entry_block_def_set (bitmap entry_block_defs)
       /* 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_block_uses)
     {
       /* 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);
     }