Intrinsify Float32Array_getIndexed on IA32 and X64.

runtime/vm/intrinsifier_x64.cc

Index: runtime/vm/intrinsifier_x64.cc
diff --git a/runtime/vm/intrinsifier_x64.cc b/runtime/vm/intrinsifier_x64.cc
index 2b812f90d1f244dd0d3d7ea75c4d6c2061767315..16259bdc73866c3b0308782e4a32cf712f2487fc 100644
--- a/runtime/vm/intrinsifier_x64.cc
+++ b/runtime/vm/intrinsifier_x64.cc
@@ -517,6 +517,37 @@ bool Intrinsifier::Uint32Array_getIndexed(Assembler* assembler) {
   return false;
 }
 

[srdjan, 2012/09/28 22:42:08]

Two empty lines between functions.

+bool Intrinsifier::Float32Array_getIndexed(Assembler* assembler) {
+    Label fall_through;

[srdjan, 2012/09/28 22:42:08]

Indent should be two spaces.

+    TestByteArrayIndex(assembler, &fall_through);
+    // After TestByteArrayIndex:
+    // * RAX has the base address of the byte array.
+    // * RBX has the index into the array.
+    // RBX contains the SMI index which is shifted left by 1.
+    // This shift means we only multiply the index by 2 not 4 (sizeof float).
+    // Load single precision float into XMM7.
+    __ movss(XMM7, FieldAddress(RAX, RBX, TIMES_2,
+                                Float32Array::data_offset()));
+    // Convert into a double precision float
+    __ cvtss2sd(XMM7, XMM7);
+    // Allocate a double instance.
+    const Class& double_class = Class::Handle(
+                           Isolate::Current()->object_store()->double_class());
+    AssemblerMacros::TryAllocate(assembler,
+                                 double_class,
+                                 &fall_through,
+                                 Assembler::kNearJump, RAX);
+    // Store XMM6 into double instance.
+    __ movsd(FieldAddress(RAX, Double::value_offset()), XMM7);
+    __ ret();
+    __ Bind(&fall_through);
+    return false;
+}
+
+bool Intrinsifier::Float32Array_setIndexed(Assembler* assembler) {
+    return false;
+}
+
 
 // Tests if two top most arguments are smis, jumps to label not_smi if not.
 // Topmost argument is in RAX.