vfp: Get rid of warnings

- Unary minus operator applied to unsigned type.
- Unsafe use of bool.

src/core/arm/skyeye_common/vfp/vfpdouble.cpp

@@ -531,7 +531,7 @@ static u32 vfp_double_fsito(ARMul_State* state, int dd, int unused, int dm, u32
     LOG_TRACE(Core_ARM11, "In %s\n", __FUNCTION__);
     vdm.sign = (m & 0x80000000) >> 16;
     vdm.exponent = 1023 + 63 - 1;
-    vdm.significand = vdm.sign ? -m : m;
+    vdm.significand = vdm.sign ? (~m + 1) : m;
 
     return vfp_double_normaliseround(state, dd, &vdm, fpscr, 0, "fsito");
 }
@@ -669,7 +669,7 @@ static u32 vfp_double_ftosi(ARMul_State* state, int sd, int unused, int dm, u32
             exceptions |= FPSCR_IXC;
 
         if (vdm.sign)
-            d = -d;
+            d = (~d + 1);
     } else {
         d = 0;
         if (vdm.exponent | vdm.significand) {
@@ -817,7 +817,7 @@ u32 vfp_double_add(struct vfp_double *vdd, struct vfp_double *vdn,struct vfp_dou
         m_sig = vdn->significand - m_sig;
         if ((s64)m_sig < 0) {
             vdd->sign = vfp_sign_negate(vdd->sign);
-            m_sig = -m_sig;
+            m_sig = (~m_sig + 1);
         } else if (m_sig == 0) {
             vdd->sign = (fpscr & FPSCR_RMODE_MASK) ==
                         FPSCR_ROUND_MINUSINF ? 0x8000 : 0;

src/core/arm/skyeye_common/vfp/vfpsingle.cpp

@@ -388,7 +388,7 @@ sqrt_invalid:
         } else {
             u64 term;
             s64 rem;
-            vsm.significand <<= !(vsm.exponent & 1);
+            vsm.significand <<= static_cast<u32>((vsm.exponent & 1) == 0);
             term = (u64)vsd.significand * vsd.significand;
             rem = ((u64)vsm.significand << 32) - term;
 
@@ -691,7 +691,7 @@ static u32 vfp_single_ftosi(ARMul_State* state, int sd, int unused, s32 m, u32 f
             exceptions |= FPSCR_IXC;
 
         if (vsm.sign)
-            d = 0-d;
+            d = (~d + 1);
     } else {
         d = 0;
         if (vsm.exponent | vsm.significand) {
@@ -843,7 +843,7 @@ vfp_single_add(struct vfp_single *vsd, struct vfp_single *vsn,
         m_sig = vsn->significand - m_sig;
         if ((s32)m_sig < 0) {
             vsd->sign = vfp_sign_negate(vsd->sign);
-            m_sig = 0-m_sig;
+            m_sig = (~m_sig + 1);
         } else if (m_sig == 0) {
             vsd->sign = (fpscr & FPSCR_RMODE_MASK) ==
                         FPSCR_ROUND_MINUSINF ? 0x8000 : 0;