Drop df_ from df_read_modify_subreg_p

...it's really a general RTL predicate, rather than something that depends
on the DF state.  Thanks to Segher for the suggestion.

2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* df.h (df_read_modify_subreg_p): Remove in favor of...
	* rtl.h (read_modify_subreg_p): ...this new function.  Take a
	const_rtx instead of an rtx.
	* cprop.c (local_cprop_find_used_regs): Update accordingly.
	* df-problems.c (df_word_lr_mark_ref): Likewise.
	* ira-lives.c (mark_pseudo_reg_live): Likewise.
	(mark_pseudo_reg_dead): Likewise.
	(mark_ref_dead): Likewise.
	* reginfo.c (init_subregs_of_mode): Likewise.
	* sched-deps.c (sched_analyze_1): Likewise.
	* df-scan.c (df_def_record_1): Likewise.
	(df_uses_record): Likewise.
	(df_read_modify_subreg_p): Remove in favor of...
	* rtlanal.c (read_modify_subreg_p): ...this new function.  Take a
	const_rtx instead of an rtx.

From-SVN: r251537

1 files changed, 0 insertions, 1 deletions

diff --git a/gcc/df.h b/gcc/df.h
index 07fd334..290fd3c 100644
--- a/gcc/df.h
+++ b/gcc/df.h
@@ -1080,7 +1080,6 @@ extern unsigned int df_hard_reg_used_count (unsigned int);
 extern bool df_regs_ever_live_p (unsigned int);
 extern void df_set_regs_ever_live (unsigned int, bool);
 extern void df_compute_regs_ever_live (bool);
-extern bool df_read_modify_subreg_p (rtx);
 extern void df_scan_verify (void);