re PR rtl-optimization/42575 (arm-eabi-gcc 64-bit multiply weirdness)

	gcc/
	PR rtl-optimization/42575
	* optabs.c (expand_doubleword_mult): Generate new pseudos to shorten
	live ranges.

	gcc/testsuite/
	PR rtl-optimization/42575
	* gcc.target/pr42575.c: New test.

From-SVN: r163334

gcc/ChangeLog

+2010-08-18  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
+	PR rtl-optimization/42575
+	* optabs.c (expand_doubleword_mult): Generate new pseudos to shorten
+	live ranges.
+
 2010-08-18  Marcus Shawcroft  <marcus.shawcroft@arm.com>
 
 	* config/arm/arm-protos.h (arm_expand_sync): New.

gcc/optabs.c

@@ -1257,7 +1257,7 @@ expand_doubleword_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
   /* OP1_HIGH should now be dead.  */
 
   adjust = expand_binop (word_mode, add_optab, adjust, temp,
-			 adjust, 0, OPTAB_DIRECT);
+			 NULL_RTX, 0, OPTAB_DIRECT);
 
   if (target && !REG_P (target))
     target = NULL_RTX;
@@ -1274,8 +1274,7 @@ expand_doubleword_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
 
   product_high = operand_subword (product, high, 1, mode);
   adjust = expand_binop (word_mode, add_optab, product_high, adjust,
-			 REG_P (product_high) ? product_high : adjust,
-			 0, OPTAB_DIRECT);
+			 NULL_RTX, 0, OPTAB_DIRECT);
   emit_move_insn (product_high, adjust);
   return product;
 }

gcc/testsuite/ChangeLog

+2010-08-18  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
+	PR rtl-optimization/42575
+	* gcc.target/pr42575.c: New test.
+
 2010-08-18  Iain Sandoe  <iains@gcc.gnu.org>
 
 	* lib/target-supports.exp (check_effective_target_tls_emulated): New.

gcc/testsuite/gcc.target/arm/pr42575.c

+/* { dg-options "-O2 -march=armv7-a" }  */
+/* Make sure RA does good job allocating registers and avoids
+   unnecessary moves.  */
+/* { dg-final { scan-assembler-not "mov" } } */
+
+long long longfunc(long long x, long long y)
+{
+      return x * y;
+}