Require SSE2 support for the ia32 port.

src/ia32/lithium-gap-resolver-ia32.cc

Index: src/ia32/lithium-gap-resolver-ia32.cc
diff --git a/src/ia32/lithium-gap-resolver-ia32.cc b/src/ia32/lithium-gap-resolver-ia32.cc
index 34b949085a15ce84a1d5d88aa75f568d381f0ff0..c80f89b86b9beb29b164ba201f48b1a39ac8861a 100644
--- a/src/ia32/lithium-gap-resolver-ia32.cc
+++ b/src/ia32/lithium-gap-resolver-ia32.cc
@@ -295,22 +295,13 @@ void LGapResolver::EmitMove(int index) {
       uint64_t int_val = BitCast<uint64_t, double>(v);
       int32_t lower = static_cast<int32_t>(int_val);
       int32_t upper = static_cast<int32_t>(int_val >> kBitsPerInt);
-      if (CpuFeatures::IsSupported(SSE2)) {
-        CpuFeatureScope scope(cgen_->masm(), SSE2);
-        XMMRegister dst = cgen_->ToDoubleRegister(destination);
-        if (int_val == 0) {
-          __ xorps(dst, dst);
-        } else {
-          __ push(Immediate(upper));
-          __ push(Immediate(lower));
-          __ movsd(dst, Operand(esp, 0));
-          __ add(esp, Immediate(kDoubleSize));
-        }
+      XMMRegister dst = cgen_->ToDoubleRegister(destination);
+      if (int_val == 0) {
+        __ xorps(dst, dst);
       } else {
         __ push(Immediate(upper));
         __ push(Immediate(lower));
-        X87Register dst = cgen_->ToX87Register(destination);
-        cgen_->X87Mov(dst, MemOperand(esp, 0));
+        __ movsd(dst, Operand(esp, 0));
         __ add(esp, Immediate(kDoubleSize));
       }
     } else {
@@ -328,59 +319,27 @@ void LGapResolver::EmitMove(int index) {
     }
 
   } else if (source->IsDoubleRegister()) {
-    if (CpuFeatures::IsSupported(SSE2)) {
-      CpuFeatureScope scope(cgen_->masm(), SSE2);
-      XMMRegister src = cgen_->ToDoubleRegister(source);
-      if (destination->IsDoubleRegister()) {
-        XMMRegister dst = cgen_->ToDoubleRegister(destination);
-        __ movaps(dst, src);
-      } else {
-        ASSERT(destination->IsDoubleStackSlot());
-        Operand dst = cgen_->ToOperand(destination);
-        __ movsd(dst, src);
-      }
+    XMMRegister src = cgen_->ToDoubleRegister(source);
+    if (destination->IsDoubleRegister()) {
+      XMMRegister dst = cgen_->ToDoubleRegister(destination);
+      __ movaps(dst, src);
     } else {
-      // load from the register onto the stack, store in destination, which must
-      // be a double stack slot in the non-SSE2 case.
       ASSERT(destination->IsDoubleStackSlot());
       Operand dst = cgen_->ToOperand(destination);
-      X87Register src = cgen_->ToX87Register(source);
-      cgen_->X87Mov(dst, src);
+      __ movsd(dst, src);
     }
   } else if (source->IsDoubleStackSlot()) {
-    if (CpuFeatures::IsSupported(SSE2)) {
-      CpuFeatureScope scope(cgen_->masm(), SSE2);
-      ASSERT(destination->IsDoubleRegister() ||
-             destination->IsDoubleStackSlot());
-      Operand src = cgen_->ToOperand(source);
-      if (destination->IsDoubleRegister()) {
-        XMMRegister dst = cgen_->ToDoubleRegister(destination);
-        __ movsd(dst, src);
-      } else {
-        // We rely on having xmm0 available as a fixed scratch register.
-        Operand dst = cgen_->ToOperand(destination);
-        __ movsd(xmm0, src);
-        __ movsd(dst, xmm0);
-      }
+    ASSERT(destination->IsDoubleRegister() ||
+           destination->IsDoubleStackSlot());
+    Operand src = cgen_->ToOperand(source);
+    if (destination->IsDoubleRegister()) {
+      XMMRegister dst = cgen_->ToDoubleRegister(destination);
+      __ movsd(dst, src);
     } else {
-      // load from the stack slot on top of the floating point stack, and then
-      // store in destination. If destination is a double register, then it
-      // represents the top of the stack and nothing needs to be done.
-      if (destination->IsDoubleStackSlot()) {
-        Register tmp = EnsureTempRegister();
-        Operand src0 = cgen_->ToOperand(source);
-        Operand src1 = cgen_->HighOperand(source);
-        Operand dst0 = cgen_->ToOperand(destination);
-        Operand dst1 = cgen_->HighOperand(destination);
-        __ mov(tmp, src0);  // Then use tmp to copy source to destination.
-        __ mov(dst0, tmp);
-        __ mov(tmp, src1);
-        __ mov(dst1, tmp);
-      } else {
-        Operand src = cgen_->ToOperand(source);
-        X87Register dst = cgen_->ToX87Register(destination);
-        cgen_->X87Mov(dst, src);
-      }
+      // We rely on having xmm0 available as a fixed scratch register.
+      Operand dst = cgen_->ToOperand(destination);
+      __ movsd(xmm0, src);
+      __ movsd(dst, xmm0);
     }
   } else {
     UNREACHABLE();
@@ -445,7 +404,6 @@ void LGapResolver::EmitSwap(int index) {
       __ mov(src, tmp0);
     }
   } else if (source->IsDoubleRegister() && destination->IsDoubleRegister()) {
-    CpuFeatureScope scope(cgen_->masm(), SSE2);
     // XMM register-register swap. We rely on having xmm0
     // available as a fixed scratch register.
     XMMRegister src = cgen_->ToDoubleRegister(source);
@@ -454,7 +412,6 @@ void LGapResolver::EmitSwap(int index) {
     __ movaps(src, dst);
     __ movaps(dst, xmm0);
   } else if (source->IsDoubleRegister() || destination->IsDoubleRegister()) {
-    CpuFeatureScope scope(cgen_->masm(), SSE2);
     // XMM register-memory swap.  We rely on having xmm0
     // available as a fixed scratch register.
     ASSERT(source->IsDoubleStackSlot() || destination->IsDoubleStackSlot());
@@ -467,7 +424,6 @@ void LGapResolver::EmitSwap(int index) {
     __ movsd(other, reg);
     __ movaps(reg, xmm0);
   } else if (source->IsDoubleStackSlot() && destination->IsDoubleStackSlot()) {
-    CpuFeatureScope scope(cgen_->masm(), SSE2);
     // Double-width memory-to-memory.  Spill on demand to use a general
     // purpose temporary register and also rely on having xmm0 available as
     // a fixed scratch register.