A64: Move integer exponent into correct register before calling MathPowStub.

src/a64/lithium-codegen-a64.cc

Index: src/a64/lithium-codegen-a64.cc
diff --git a/src/a64/lithium-codegen-a64.cc b/src/a64/lithium-codegen-a64.cc
index aeb18d05860e2b13bd2187edb7168fe0e6075431..b51e93b77def13a8c71255fbdd389504ff939af8 100644
--- a/src/a64/lithium-codegen-a64.cc
+++ b/src/a64/lithium-codegen-a64.cc
@@ -3785,6 +3785,7 @@ void LCodeGen::DoPower(LPower* instr) {
     MathPowStub stub(MathPowStub::TAGGED);
     __ CallStub(&stub);
   } else if (exponent_type.IsInteger32()) {
+    __ Mov(x12, x11);

[ulan, 2014/01/29 15:13:41]

MathPowStub expects integer exponent in x12

[baptiste.afsa1, 2014/01/29 15:23:48]

Isn't it possible to modify register constraints in lithium-a64.cc to avoid
doing this move explicitly?

[ulan, 2014/01/29 15:33:14]

Agreed. Done.

On 2014/01/29 15:23:48, baptiste.afsa1 wrote:

     MathPowStub stub(MathPowStub::INTEGER);
     __ CallStub(&stub);
   } else {