ppc: [liftoff] implement emit_i64_eqz/set_cond

Change-Id: Idf927a4c8bc5e4751e5e8913fe9912fd44001190
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2857854Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74263}

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

@@ -645,13 +645,28 @@ void LiftoffAssembler::emit_i32_set_cond(LiftoffCondition liftoff_cond,
 }
 
 void LiftoffAssembler::emit_i64_eqz(Register dst, LiftoffRegister src) {
-  bailout(kUnsupportedArchitecture, "emit_i64_eqz");
+  Label done;
+  cmpi(src.gp(), Operand(0));
+  mov(dst, Operand(1));
+  beq(&done);
+  mov(dst, Operand::Zero());
+  bind(&done);
 }
 
 void LiftoffAssembler::emit_i64_set_cond(LiftoffCondition liftoff_cond,
                                          Register dst, LiftoffRegister lhs,
                                          LiftoffRegister rhs) {
-  bailout(kUnsupportedArchitecture, "emit_i64_set_cond");
+  bool use_signed = liftoff::UseSignedOp(liftoff_cond);
+  if (use_signed) {
+    cmp(lhs.gp(), rhs.gp());
+  } else {
+    cmpl(lhs.gp(), rhs.gp());
+  }
+  Label done;
+  mov(dst, Operand(1));
+  b(liftoff::ToCondition(liftoff_cond), &done);
+  mov(dst, Operand::Zero());
+  bind(&done);
 }
 
 void LiftoffAssembler::emit_f32_set_cond(LiftoffCondition liftoff_cond,