Revert r245598

gcc/
	PR target/78660
	Revert:
	2017-02-20  Matthew Fortune  <matthew.fortune@imgtec.com>

	* lra-constraints.c (curr_insn_transform): Handle
	WORD_REGISTER_OPERATIONS requirements when reloading SUBREGs.

From-SVN: r245626

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d3eaaf5..82e8e8c 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2017-02-21  Matthew Fortune  <matthew.fortune@imgtec.com>
+
+       PR target/78660
+       Revert:
+       2017-02-20  Matthew Fortune  <matthew.fortune@imgtec.com>
+
+       * lra-constraints.c (curr_insn_transform): Handle
+       WORD_REGISTER_OPERATIONS requirements when reloading SUBREGs.
+
 2017-02-21  Martin Liska  <mliska@suse.cz>
 
        * config/i386/i386.opt: Replace -masm-dialect with -masm.

diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index bd5fbcd..35539a9 100644 (file)
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -4131,15 +4131,7 @@ curr_insn_transform (bool check_only_p)
                          && (goal_alt[i] == NO_REGS
                              || (simplify_subreg_regno
                                  (ira_class_hard_regs[goal_alt[i]][0],
-                                  GET_MODE (reg), byte, mode) >= 0)))
-                     /* WORD_REGISTER_OPERATIONS targets require the register
-                        to be reloaded when the outer mode is strictly
-                        narrower than the inner mode.  Note: It may be
-                        necessary to always reload the inner mode here but it
-                        requires further investigation.  */
-                     || (GET_MODE_PRECISION (mode)
-                         < GET_MODE_PRECISION (GET_MODE (reg))
-                         && WORD_REGISTER_OPERATIONS)))
+                                  GET_MODE (reg), byte, mode) >= 0)))))
                {
                  /* An OP_INOUT is required when reloading a subreg of a
                     mode wider than a word to ensure that data beyond the