[maglev] Support GapMove with double registers

Bug: v8:7700
Change-Id: I766b523cfaf30eda9c33d9f2c580bc72a2eaa9ca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3605815
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80203}

src/maglev/maglev-ir.cc

@@ -606,18 +606,31 @@ void GapMove::AllocateVreg(MaglevVregAllocationState* vreg_state,
 }
 void GapMove::GenerateCode(MaglevCodeGenState* code_gen_state,
                            const ProcessingState& state) {
-  if (source().IsAnyRegister()) {
+  if (source().IsRegister()) {
     Register source_reg = ToRegister(source());
     if (target().IsAnyRegister()) {
+      DCHECK(target().IsRegister());
       __ movq(ToRegister(target()), source_reg);
     } else {
       __ movq(code_gen_state->ToMemOperand(target()), source_reg);
     }
+  } else if (source().IsDoubleRegister()) {
+    DoubleRegister source_reg = ToDoubleRegister(source());
+    if (target().IsAnyRegister()) {
+      DCHECK(target().IsDoubleRegister());
+      __ Movsd(ToDoubleRegister(target()), source_reg);
+    } else {
+      __ Movsd(code_gen_state->ToMemOperand(target()), source_reg);
+    }
   } else {
+    DCHECK(source().IsAnyStackSlot());
     MemOperand source_op = code_gen_state->ToMemOperand(source());
-    if (target().IsAnyRegister()) {
+    if (target().IsRegister()) {
       __ movq(ToRegister(target()), source_op);
+    } else if (target().IsDoubleRegister()) {
+      __ Movsd(ToDoubleRegister(target()), source_op);
     } else {
+      DCHECK(target().IsAnyStackSlot());
       __ movq(kScratchRegister, source_op);
       __ movq(code_gen_state->ToMemOperand(target()), kScratchRegister);
     }