[committed] hppa: Fix handling of secondary reloads for floating-point loads and stores

[committed] hppa: Fix handling of secondary reloads for floating-point loads and stores

[John David Anglin]

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In rare situations, pa_emit_move_sequence needs to handle a paradoxical 
SUBREG in a
floating-point load or store.  There is existing code to adjust the 
operand's address but
we fail to emit the reload if we don't need to load the address to a 
register.  We just
fall through pa_emit_move_sequence and emit the original operand.

This patch revises the handling of these reloads to always  emit the 
reload with the
adjusted operand.

Tested on hppa-unknown-linux-gnu and hppa64-hp-hpux11.11.  Committed to 
trunk.

Dave

-- 
John David Anglin  dave.anglin@bell.net


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2018-03-14  John David Anglin  <danglin@gcc.gnu.org>

	PR target/83451
	* config/pa/pa.c (pa_emit_move_sequence):  Always emit secondary reload
	insn for floating-point loads and stores.

Index: config/pa/pa.c
===================================================================
--- config/pa/pa.c	(revision 258420)
+++ config/pa/pa.c	(working copy)
@@ -1750,9 +1750,7 @@
 		}
 	      else
 		emit_move_insn (scratch_reg, XEXP (op1, 0));
-	      emit_insn (gen_rtx_SET (operand0,
-				  replace_equiv_address (op1, scratch_reg)));
-	      return 1;
+	      op1 = replace_equiv_address (op1, scratch_reg);
 	    }
 	}
       else if ((!INT14_OK_STRICT && symbolic_memory_operand (op1, VOIDmode))
@@ -1762,10 +1760,10 @@
 	  /* Load memory address into SCRATCH_REG.  */
 	  scratch_reg = force_mode (word_mode, scratch_reg);
 	  emit_move_insn (scratch_reg, XEXP (op1, 0));
-	  emit_insn (gen_rtx_SET (operand0,
-				  replace_equiv_address (op1, scratch_reg)));
-	  return 1;
+	  op1 = replace_equiv_address (op1, scratch_reg);
 	}
+      emit_insn (gen_rtx_SET (operand0, op1));
+      return 1;
     }
   else if (scratch_reg
 	   && FP_REG_P (operand1)
@@ -1803,9 +1801,7 @@
 		}
 	      else
 		emit_move_insn (scratch_reg, XEXP (op0, 0));
-	      emit_insn (gen_rtx_SET (replace_equiv_address (op0, scratch_reg),
-				      operand1));
-	      return 1;
+	      op0 = replace_equiv_address (op0, scratch_reg);
 	    }
 	}
       else if ((!INT14_OK_STRICT && symbolic_memory_operand (op0, VOIDmode))
@@ -1815,10 +1811,10 @@
 	  /* Load memory address into SCRATCH_REG.  */
 	  scratch_reg = force_mode (word_mode, scratch_reg);
 	  emit_move_insn (scratch_reg, XEXP (op0, 0));
-	  emit_insn (gen_rtx_SET (replace_equiv_address (op0, scratch_reg),
-				  operand1));
-	  return 1;
+	  op0 = replace_equiv_address (op0, scratch_reg);
 	}
+      emit_insn (gen_rtx_SET (op0, operand1));
+      return 1;
     }
   /* Handle secondary reloads for loads of FP registers from constant
      expressions by forcing the constant into memory.  For the most part,