Vector ICs: platform support for vector-based stores.

src/ic/ia32/stub-cache-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
 
 #define __ ACCESS_MASM(masm)
 
 
 static void ProbeTable(Isolate* isolate, MacroAssembler* masm,
                        Code::Kind ic_kind, Code::Flags flags,
                        StubCache::Table table, Register name, Register receiver,
                        // Number of the cache entry pointer-size scaled.
                        Register offset, Register extra) {
   ExternalReference key_offset(isolate->stub_cache()->key_reference(table));
   ExternalReference value_offset(isolate->stub_cache()->value_reference(table));
   ExternalReference map_offset(isolate->stub_cache()->map_reference(table));
 
   Label miss;
+  bool is_vector_store =
+      IC::ICUseVector(ic_kind) &&
+      (ic_kind == Code::STORE_IC || ic_kind == Code::KEYED_STORE_IC);
 
   // Multiply by 3 because there are 3 fields per entry (name, code, map).
   __ lea(offset, Operand(offset, offset, times_2, 0));
 
   if (extra.is_valid()) {
     // Get the code entry from the cache.
     __ mov(extra, Operand::StaticArray(offset, times_1, value_offset));
 
     // Check that the key in the entry matches the name.
     __ cmp(name, Operand::StaticArray(offset, times_1, key_offset));
@@ skipping 11 matching lines @@
     __ j(not_equal, &miss);
 
 #ifdef DEBUG
     if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
       __ jmp(&miss);
     } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
       __ jmp(&miss);
     }
 #endif
 
-    if (IC::ICUseVector(ic_kind)) {
-      // The vector and slot were pushed onto the stack before starting the
-      // probe, and need to be dropped before calling the handler.
+    // The vector and slot were pushed onto the stack before starting the
+    // probe, and need to be dropped before calling the handler.
+    if (is_vector_store) {
+      // The overlap here is rather embarrassing. One does what one must.
+      Register vector = VectorStoreICDescriptor::VectorRegister();
+      DCHECK(extra.is(VectorStoreICDescriptor::SlotRegister()));
+      __ add(extra, Immediate(Code::kHeaderSize - kHeapObjectTag));
+      __ pop(vector);
+      __ xchg(extra, Operand(esp, 0));
+      // Jump to the first instruction in the code stub.
+      __ ret(0);
+    } else {
       __ pop(LoadWithVectorDescriptor::VectorRegister());
       __ pop(LoadDescriptor::SlotRegister());
+      __ add(extra, Immediate(Code::kHeaderSize - kHeapObjectTag));
+      __ jmp(extra);
     }
 
-    // Jump to the first instruction in the code stub.
-    __ add(extra, Immediate(Code::kHeaderSize - kHeapObjectTag));
-    __ jmp(extra);
-
     __ bind(&miss);
   } else {
+    DCHECK(ic_kind == Code::STORE_IC || ic_kind == Code::KEYED_STORE_IC);
+
     // Save the offset on the stack.
     __ push(offset);
 
     // Check that the key in the entry matches the name.
     __ cmp(name, Operand::StaticArray(offset, times_1, key_offset));
     __ j(not_equal, &miss);
 
     // Check the map matches.
     __ mov(offset, Operand::StaticArray(offset, times_1, map_offset));
     __ cmp(offset, FieldOperand(receiver, HeapObject::kMapOffset));
@@ skipping 16 matching lines @@
       __ jmp(&miss);
     } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
       __ jmp(&miss);
     }
 #endif
 
     // Restore offset and re-load code entry from cache.
     __ pop(offset);
     __ mov(offset, Operand::StaticArray(offset, times_1, value_offset));
 
-    if (IC::ICUseVector(ic_kind)) {
+    // Jump to the first instruction in the code stub.
+    if (is_vector_store) {
       // The vector and slot were pushed onto the stack before starting the
       // probe, and need to be dropped before calling the handler.
-      Register vector = LoadWithVectorDescriptor::VectorRegister();
-      Register slot = LoadDescriptor::SlotRegister();
-      DCHECK(!offset.is(vector) && !offset.is(slot));
-
+      Register vector = VectorStoreICDescriptor::VectorRegister();
+      DCHECK(offset.is(VectorStoreICDescriptor::SlotRegister()));
+      __ add(offset, Immediate(Code::kHeaderSize - kHeapObjectTag));
       __ pop(vector);
-      __ pop(slot);
+      __ xchg(offset, Operand(esp, 0));
+      __ ret(0);
+    } else {
+      __ add(offset, Immediate(Code::kHeaderSize - kHeapObjectTag));
+      __ jmp(offset);
     }
 
-    // Jump to the first instruction in the code stub.
-    __ add(offset, Immediate(Code::kHeaderSize - kHeapObjectTag));
-    __ jmp(offset);
-
     // Pop at miss.
     __ bind(&miss);
     __ pop(offset);
   }
 }
 
 
 void StubCache::GenerateProbe(MacroAssembler* masm, Code::Kind ic_kind,
                               Code::Flags flags, Register receiver,
                               Register name, Register scratch, Register extra,
@@ skipping 61 matching lines @@
   __ bind(&miss);
   __ IncrementCounter(counters->megamorphic_stub_cache_misses(), 1);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32