ARM: Implement DoPower in the lithium code generator.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 786ceeb3cac0b52afa0500645679d174ee08ca5d..1278e98f327451bc672141275973272cfd3df277 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -1418,8 +1418,18 @@ LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
 
 
 LInstruction* LChunkBuilder::DoPower(HPower* instr) {
-  Abort("LPower instruction not implemented on ARM");
-  return NULL;
+  ASSERT(instr->representation().IsDouble());
+  // We call a C function for double power. It can't trigger a GC.
+  // We need to use fixed result register for the call.
+  Representation exponent_type = instr->right()->representation();
+  ASSERT(instr->left()->representation().IsDouble());
+  LOperand* left = UseFixedDouble(instr->left(), d1);
+  LOperand* right = exponent_type.IsDouble() ?
+      UseFixedDouble(instr->right(), d2) :
+      UseFixed(instr->right(), r0);
+  LPower* result = new LPower(left, right);
+  return MarkAsCall(DefineFixedDouble(result, d3), instr,

[Søren Thygesen Gjesse, 2011/02/17 09:59:56]

Please do either
MarkAsCall(
    DefineFixedDouble(result, d3), instr, CAN_DEOPTIMIZE_EAGERLY);

or

MarkAsCall(DefineFixedDouble(result, d3),
           instr,
           CAN_DEOPTIMIZE_EAGERLY);

I think the first will fit.

[Karl Klose, 2011/02/21 13:34:59]

Done.

+                    CAN_DEOPTIMIZE_EAGERLY);
 }