Revert r278441

To restore powerpc bootstrap.

2019-11-19  Richard Sandiford  <richard.sandiford@arm.com>
gcc/
	Revert:
	2019-11-18  Richard Sandiford  <richard.sandiford@arm.com>

	* cse.c (cse_insn): Delete no-op register moves too.
	* simplify-rtx.c (comparison_to_mask): Handle unsigned comparisons.
	Take a second comparison to control the value for NE.
	(mask_to_comparison): Handle unsigned comparisons.
	(simplify_logical_relational_operation): Likewise.  Update call
	to comparison_to_mask.  Handle AND if !HONOR_NANs.
	(simplify_binary_operation_1): Call the above for AND too.

gcc/testsuite/
	Revert:
	2019-11-18  Richard Sandiford  <richard.sandiford@arm.com>

	* gcc.target/aarch64/sve/acle/asm/ptest_pmore.c: New test.

From-SVN: r278455

1 files changed, 7 insertions, 7 deletions

diff --git a/gcc/cse.c b/gcc/cse.c
index 0ab79b9..ab9b8b4 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -4625,7 +4625,7 @@ cse_insn (rtx_insn *insn)
   for (i = 0; i < n_sets; i++)
     {
       bool repeat = false;
-      bool noop_insn = false;
+      bool mem_noop_insn = false;
       rtx src, dest;
       rtx src_folded;
       struct table_elt *elt = 0, *p;
@@ -5324,17 +5324,17 @@ cse_insn (rtx_insn *insn)
 	    }
 
 	  /* Similarly, lots of targets don't allow no-op
-	     (set (mem x) (mem x)) moves.  Even (set (reg x) (reg x))
-	     might be impossible for certain registers (like CC registers).  */
+	     (set (mem x) (mem x)) moves.  */
 	  else if (n_sets == 1
-		   && (MEM_P (trial) || REG_P (trial))
+		   && MEM_P (trial)
+		   && MEM_P (dest)
 		   && rtx_equal_p (trial, dest)
 		   && !side_effects_p (dest)
 		   && (cfun->can_delete_dead_exceptions
 		       || insn_nothrow_p (insn)))
 	    {
 	      SET_SRC (sets[i].rtl) = trial;
-	      noop_insn = true;
+	      mem_noop_insn = true;
 	      break;
 	    }
 
@@ -5562,8 +5562,8 @@ cse_insn (rtx_insn *insn)
 	  sets[i].rtl = 0;
 	}
 
-      /* Similarly for no-op moves.  */
-      else if (noop_insn)
+      /* Similarly for no-op MEM moves.  */
+      else if (mem_noop_insn)
 	{
 	  if (cfun->can_throw_non_call_exceptions && can_throw_internal (insn))
 	    cse_cfg_altered = true;