(emit_no_conflict_block): Don't move target to itself if that takes multiple insns.

(emit_no_conflict_block): Don't move target to itself
if that takes multiple insns.
(expand_binop): For complex mult and div, avoid fetching operand
components more than once from memory.

From-SVN: r3647

diff --git a/gcc/optabs.c b/gcc/optabs.c
index cc192be2e3910e75a71a44f7ed37daf59d176767..65a56cdca932910a28245d2b576c0b2bb5a518ce 100644 (file)
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -916,16 +916,21 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
 
          if (imag0 && imag1)
            {
-             rtx temp =
-               expand_binop (submode, sub_optab,
-                             expand_binop (submode, binoptab, real0,
-                                           real1, 0, unsignedp, methods),
-                             expand_binop (submode, binoptab, imag0,
-                                           imag1, 0, unsignedp, methods),
-                             realr, unsignedp, methods);
+             /* Don't fetch these from memory more than once.  */
+             real0 = force_reg (submode, real0);
+             real1 = force_reg (submode, real1);
+             imag0 = force_reg (submode, imag0);
+             imag1 = force_reg (submode, imag1);
+
+             res = expand_binop (submode, sub_optab,
+                                 expand_binop (submode, binoptab, real0,
+                                               real1, 0, unsignedp, methods),
+                                 expand_binop (submode, binoptab, imag0,
+                                               imag1, 0, unsignedp, methods),
+                                 realr, unsignedp, methods);
 
-             if (temp != realr)
-               emit_move_insn (realr, temp);
+             if (res != realr)
+               emit_move_insn (realr, res);
 
              res = expand_binop (submode, add_optab,
                                  expand_binop (submode, binoptab,
@@ -940,6 +945,10 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
            }
          else
            {
+             /* Don't fetch these from memory more than once.  */
+             real0 = force_reg (submode, real0);
+             real1 = force_reg (submode, real1);
+
              res = expand_binop (submode, binoptab, real0, real1,
                                  realr, unsignedp, methods);
              if (res != realr)
@@ -961,6 +970,10 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
          
          if (! imag1)
            {   /* (a+ib) / (c+i0) = (a/c) + i(b/c) */
+
+             /* Don't fetch these from memory more than once.  */
+             real1 = force_reg (submode, real1);
+
              /* Simply divide the real and imaginary parts by `c' */
              res = expand_binop (submode, binoptab, real0, real1,
                                  realr, unsignedp, methods);
@@ -981,6 +994,13 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
              
              optab mulopt = unsignedp ? umul_widen_optab : smul_optab;
 
+             /* Don't fetch these from memory more than once.  */
+             real0 = force_reg (submode, real0);
+             real1 = force_reg (submode, real1);
+             if (imag0)
+               imag0 = force_reg (submode, imag0);
+             imag1 = force_reg (submode, imag1);
+
              /* Divisor: c*c + d*d */
              divisor = expand_binop (submode, add_optab,
                                      expand_binop (submode, mulopt,
@@ -1984,9 +2004,16 @@ emit_no_conflict_block (insns, target, op0, op1, equiv)
                                    REG_NOTES (insn));
     }
 
-  last = emit_move_insn (target, target);
-  if (equiv)
-    REG_NOTES (last) = gen_rtx (EXPR_LIST, REG_EQUAL, equiv, REG_NOTES (last));
+  if (mov_optab->handlers[(int) GET_MODE (target)].insn_code
+      != CODE_FOR_nothing)
+    {
+      last = emit_move_insn (target, target);
+      if (equiv)
+       REG_NOTES (last)
+         = gen_rtx (EXPR_LIST, REG_EQUAL, equiv, REG_NOTES (last));
+    }
+  else
+    last = get_last_insn ();
 
   if (prev == 0)
     first = get_insns ();