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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
This commit is contained in:
Richard Sandiford 2019-09-30 16:20:34 +00:00 committed by Richard Sandiford
parent c92503717b
commit 559c1ae100
2 changed files with 13 additions and 3 deletions
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7
gcc/ChangeLog
View File

@ -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.

9
gcc/df-scan.c
View File

@ -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);
}