* optabs.c (expand_binop): For double-word integer multiplies,

        do not compute intermediate results into something that is
        not a register (such as a SUBREG or MEM).

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@53718 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dbdb2f4..dcb685d 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -42,6 +42,10 @@
 
 2002-05-21  Jeffrey A Law  <law@redhat.com>
 
+       * optabs.c (expand_binop): For double-word integer multiplies,
+       do not compute intermediate results into something that is
+       not a register (such as a SUBREG or MEM).
+
        * i386.c (ix86_sched_reorder_ppro): Fix typo/thinko.
        (ix86_sched_reorder): Make sure to initialize scheduling
        data even when there's only one insn in the ready queue.

diff --git a/gcc/optabs.c b/gcc/optabs.c
index 46b86c5..da43dd1 100644 (file)
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -1461,6 +1461,9 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
          rtx temp = expand_binop (word_mode, binoptab, op0_low, op1_xhigh,
                                   NULL_RTX, 0, OPTAB_DIRECT);
 
+         if (!REG_P (product_high))
+           product_high = force_reg (word_mode, product_high);
+
          if (temp != 0)
            temp = expand_binop (word_mode, add_optab, temp, product_high,
                                 product_high, 0, next_methods);
@@ -1480,6 +1483,8 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
          if (temp != 0 && temp != product_high)
            emit_move_insn (product_high, temp);
 
+         emit_move_insn (operand_subword (product, high, 1, mode), product_high);
+
          if (temp != 0)
            {
              if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)