ppc: [liftoff] implement LoadConstant

Change-Id: Ia3c703dc47744cffc3f86ec46abb341e6c37590c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2857637Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74283}

src/wasm/baseline/ppc/liftoff-assembler-ppc.h

@@ -128,7 +128,30 @@ bool LiftoffAssembler::NeedsAlignment(ValueKind kind) {
 
 void LiftoffAssembler::LoadConstant(LiftoffRegister reg, WasmValue value,
                                     RelocInfo::Mode rmode) {
-  bailout(kUnsupportedArchitecture, "LoadConstant");
+  switch (value.type().kind()) {
+    case kI32:
+      mov(reg.gp(), Operand(value.to_i32(), rmode));
+      break;
+    case kI64:
+      mov(reg.gp(), Operand(value.to_i64(), rmode));
+      break;
+    case kF32: {
+      UseScratchRegisterScope temps(this);
+      Register scratch = temps.Acquire();
+      mov(scratch, Operand(value.to_f32_boxed().get_scalar()));
+      MovIntToFloat(reg.fp(), scratch);
+      break;
+    }
+    case kF64: {
+      UseScratchRegisterScope temps(this);
+      Register scratch = temps.Acquire();
+      mov(scratch, Operand(value.to_f32_boxed().get_scalar()));
+      MovInt64ToDouble(reg.fp(), scratch);
+      break;
+    }
+    default:
+      UNREACHABLE();
+  }
 }
 
 void LiftoffAssembler::LoadInstanceFromFrame(Register dst) {