[v8-dev] ARM: Improve double to integer truncation on ARM.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
===================================================================
--- src/arm/lithium-codegen-arm.cc	(revision 13104)
+++ src/arm/lithium-codegen-arm.cc	(working copy)
@@ -4726,7 +4726,6 @@
 
   if (instr->truncating()) {
     Register scratch3 = ToRegister(instr->temp2());
-    SwVfpRegister single_scratch = double_scratch.low();
     ASSERT(!scratch3.is(input_reg) &&
            !scratch3.is(scratch1) &&
            !scratch3.is(scratch2));
@@ -4748,7 +4747,7 @@
 
     __ EmitECMATruncate(input_reg,
                         double_scratch2,
-                        single_scratch,
+                        double_scratch,
                         scratch1,
                         scratch2,
                         scratch3);
@@ -4830,20 +4829,19 @@
   Register scratch1 = scratch0();
   Register scratch2 = ToRegister(instr->temp());
   DwVfpRegister double_input = ToDoubleRegister(instr->value());
+  DwVfpRegister double_scratch = double_scratch0();
 
   Label done;
 
   if (instr->truncating()) {
     Register scratch3 = ToRegister(instr->temp2());
-    SwVfpRegister single_scratch = double_scratch0().low();
     __ EmitECMATruncate(result_reg,
                         double_input,
-                        single_scratch,
+                        double_scratch,
                         scratch1,
                         scratch2,
                         scratch3);
   } else {
-    DwVfpRegister double_scratch = double_scratch0();
     __ EmitVFPTruncate(kRoundToMinusInf,
                        result_reg,
                        double_input,