revert: optabs.c (prepare_cmp_insn): Temporarily disable test that causes…

revert: optabs.c (prepare_cmp_insn): Temporarily disable test that causes spurious differences between trunk and...

2009-05-12  Paolo Bonzini  <bonzini@gnu.org>

	Revert:

	2009-05-12  Paolo Bonzini  <bonzini@gnu.org>

	* optabs.c (prepare_cmp_insn): Temporarily disable test that
	causes spurious differences between trunk and cond-optab branch.

From-SVN: r147426

gcc/ChangeLog

 2009-05-12  Paolo Bonzini  <bonzini@gnu.org>
 
+	Revert:
+
+	2009-05-12  Paolo Bonzini  <bonzini@gnu.org>
+
+	* optabs.c (prepare_cmp_insn): Temporarily disable test that
+	causes spurious differences between trunk and cond-optab branch.
+
+2009-05-12  Paolo Bonzini  <bonzini@gnu.org>
+
         * dojump.c (compare_from_rtx): Delete.
         * expmed.c (emit_store_flag): Only try cstore_optab.  Canonicalize
         any MODE_CC mode to the cstorecc4 pattern.  Use prepare_operand, fail

gcc/optabs.c

@@ -4015,6 +4015,17 @@ prepare_cmp_insn (rtx x, rtx y, enum rtx_code comparison, rtx size,
   gcc_assert (methods == OPTAB_DIRECT || methods == OPTAB_WIDEN
 	      || methods == OPTAB_LIB_WIDEN);
 
+  /* If we are optimizing, force expensive constants into a register.  */
+  if (CONSTANT_P (x) && optimize
+      && (rtx_cost (x, COMPARE, optimize_insn_for_speed_p ())
+          > COSTS_N_INSNS (1)))
+    x = force_reg (mode, x);
+
+  if (CONSTANT_P (y) && optimize
+      && (rtx_cost (y, COMPARE, optimize_insn_for_speed_p ())
+          > COSTS_N_INSNS (1)))
+    y = force_reg (mode, y);
+
 #ifdef HAVE_cc0
   /* Make sure if we have a canonical comparison.  The RTL
      documentation states that canonical comparisons are required only