X87: [wasm] Int64Lowering of I64Shl on ia32.

src/x87/macro-assembler-x87.cc

Index: src/x87/macro-assembler-x87.cc
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index 0c459ebfd420f5208d8b4b7c05ef6a26d831a4c3..6277ada6f03349a769c029509f02f77d7f64c5b7 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.cc
@@ -597,6 +597,27 @@ void MacroAssembler::DebugBreak() {
   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;