ARM: Small optimisation of VFP immediate creation

src/arm/code-stubs-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3618 matching lines @@
     __ VFPCompareAndSetFlags(double_scratch, double_exponent);
     __ b(eq, &int_exponent_convert);
 
     if (exponent_type_ == ON_STACK) {
       // Detect square root case.  Crankshaft detects constant +/-0.5 at
       // compile time and uses DoMathPowHalf instead.  We then skip this check
       // for non-constant cases of +/-0.5 as these hardly occur.
       Label not_plus_half;
 
       // Test for 0.5.
-      __ vmov(double_scratch, 0.5);
+      __ vmov(double_scratch, 0.5, scratch);
       __ VFPCompareAndSetFlags(double_exponent, double_scratch);
       __ b(ne, &not_plus_half);
 
       // Calculates square root of base.  Check for the special case of
       // Math.pow(-Infinity, 0.5) == Infinity (ECMA spec, 15.8.2.13).
-      __ vmov(double_scratch, -V8_INFINITY);
+      __ vmov(double_scratch, -V8_INFINITY, scratch);
       __ VFPCompareAndSetFlags(double_base, double_scratch);
       __ vneg(double_result, double_scratch, eq);
       __ b(eq, &done);
 
       // Add +0 to convert -0 to +0.
       __ vadd(double_scratch, double_base, kDoubleRegZero);
       __ vsqrt(double_result, double_scratch);
       __ jmp(&done);
 
       __ bind(&not_plus_half);
-      __ vmov(double_scratch, -0.5);
+      __ vmov(double_scratch, -0.5, scratch);
       __ VFPCompareAndSetFlags(double_exponent, double_scratch);
       __ b(ne, &call_runtime);
 
       // Calculates square root of base.  Check for the special case of
       // Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
-      __ vmov(double_scratch, -V8_INFINITY);
+      __ vmov(double_scratch, -V8_INFINITY, scratch);
       __ VFPCompareAndSetFlags(double_base, double_scratch);
       __ vmov(double_result, kDoubleRegZero, eq);
       __ b(eq, &done);
 
       // Add +0 to convert -0 to +0.
       __ vadd(double_scratch, double_base, kDoubleRegZero);
-      __ vmov(double_result, 1.0);
+      __ vmov(double_result, 1.0, scratch);
       __ vsqrt(double_scratch, double_scratch);
       __ vdiv(double_result, double_result, double_scratch);
       __ jmp(&done);
     }
 
     __ push(lr);
     {
       AllowExternalCallThatCantCauseGC scope(masm);
       __ PrepareCallCFunction(0, 2, scratch);
       __ SetCallCDoubleArguments(double_base, double_exponent);
@@ skipping 14 matching lines @@
   __ bind(&int_exponent);
 
   // Get two copies of exponent in the registers scratch and exponent.
   if (exponent_type_ == INTEGER) {
     __ mov(scratch, exponent);
   } else {
     // Exponent has previously been stored into scratch as untagged integer.
     __ mov(exponent, scratch);
   }
   __ vmov(double_scratch, double_base);  // Back up base.
-  __ vmov(double_result, 1.0);
+  __ vmov(double_result, 1.0, scratch2);
 
   // Get absolute value of exponent.
   __ cmp(scratch, Operand(0));
   __ mov(scratch2, Operand(0), LeaveCC, mi);
   __ sub(scratch, scratch2, scratch, LeaveCC, mi);
 
   Label while_true;
   __ bind(&while_true);
   __ mov(scratch, Operand(scratch, ASR, 1), SetCC);
   __ vmul(double_result, double_result, double_scratch, cs);
   __ vmul(double_scratch, double_scratch, double_scratch, ne);
   __ b(ne, &while_true);
 
   __ cmp(exponent, Operand(0));
   __ b(ge, &done);
-  __ vmov(double_scratch, 1.0);
+  __ vmov(double_scratch, 1.0, scratch);
   __ vdiv(double_result, double_scratch, double_result);
   // Test whether result is zero.  Bail out to check for subnormal result.
   // Due to subnormals, x^-y == (1/x)^y does not hold in all cases.
   __ VFPCompareAndSetFlags(double_result, 0.0);
   __ b(ne, &done);
   // double_exponent may not containe the exponent value if the input was a
   // smi.  We set it with exponent value before bailing out.
   __ vmov(single_scratch, exponent);
   __ vcvt_f64_s32(double_exponent, single_scratch);
 
@@ skipping 3882 matching lines @@
 
   __ Pop(lr, r5, r1);
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM