X87: [wasm] Int64Lowering of I64Shl on ia32.

src/x87/macro-assembler-x87.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_X87
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 579 matching lines @@
 }
 
 void MacroAssembler::DebugBreak() {
   Move(eax, Immediate(0));
   mov(ebx, Immediate(ExternalReference(Runtime::kHandleDebuggerStatement,
                                        isolate())));
   CEntryStub ces(isolate(), 1);
   call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT);
 }
 
+void MacroAssembler::PairShl(Register dst, Register src, uint8_t shift) {

[ahaas, 2016/03/08 07:23:40]

On ia32 I will rename the parameters to "high" and "low" instead of "dst" and
"src", because "dst" and "src" may be misleading. You could rename the
parameters in this CL already.

+  if (shift >= 32) {
+    mov(dst, src);
+    shl(dst, shift - 32);
+    xor_(src, src);
+  } else {
+    shld(dst, src, shift);
+    shl(src, shift);
+  }
+}
+
+void MacroAssembler::PairShl_cl(Register dst, Register src) {
+  shld_cl(dst, src);
+  shl_cl(src);
+  Label done;
+  test(ecx, Immediate(0x20));
+  j(equal, &done, Label::kNear);
+  mov(dst, src);
+  xor_(src, src);
+  bind(&done);
+}
 
 bool MacroAssembler::IsUnsafeImmediate(const Immediate& x) {
   static const int kMaxImmediateBits = 17;
   if (!RelocInfo::IsNone(x.rmode_)) return false;
   return !is_intn(x.x_, kMaxImmediateBits);
 }
 
 
 void MacroAssembler::SafeMove(Register dst, const Immediate& x) {
   if (IsUnsafeImmediate(x) && jit_cookie() != 0) {
@@ skipping 2465 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87