Fix exception propagation for VFP single precision

2 files changed, 38 insertions, 33 deletions

diff --git a/src/core/arm/skyeye_common/vfp/vfp_helper.h b/src/core/arm/skyeye_common/vfp/vfp_helper.h
index c1cc4fd7e..c66a3fad4 100644
--- a/src/core/arm/skyeye_common/vfp/vfp_helper.h
+++ b/src/core/arm/skyeye_common/vfp/vfp_helper.h
@@ -271,8 +271,9 @@ inline int vfp_single_type(const vfp_single* s)
 // Unpack a single-precision float.  Note that this returns the magnitude
 // of the single-precision float mantissa with the 1. if necessary,
 // aligned to bit 30.
-inline void vfp_single_unpack(vfp_single* s, s32 val, u32* fpscr)
+inline u32 vfp_single_unpack(vfp_single* s, s32 val, u32 fpscr)
 {
+    u32 exceptions = 0;
     s->sign = vfp_single_packed_sign(val) >> 16,
     s->exponent = vfp_single_packed_exponent(val);
 
@@ -283,12 +284,13 @@ inline void vfp_single_unpack(vfp_single* s, s32 val, u32* fpscr)
 
     // If flush-to-zero mode is enabled, turn the denormal into zero.
     // On a VFPv2 architecture, the sign of the zero is always positive.
-    if ((*fpscr & FPSCR_FLUSH_TO_ZERO) != 0 && (vfp_single_type(s) & VFP_DENORMAL) != 0) {
+    if ((fpscr & FPSCR_FLUSH_TO_ZERO) != 0 && (vfp_single_type(s) & VFP_DENORMAL) != 0) {
         s->sign = 0;
         s->exponent = 0;
         s->significand = 0;
-        *fpscr |= FPSCR_IDC;
+        exceptions |= FPSCR_IDC;
     }
+    return exceptions;
 }
 
 // Re-pack a single-precision float. This assumes that the float is
diff --git a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
index e47ad2760..5fb6b51ec 100644
--- a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
+++ b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
@@ -334,8 +334,9 @@ static u32 vfp_single_fsqrt(ARMul_State* state, int sd, int unused, s32 m, u32 f
 {
     struct vfp_single vsm, vsd, *vsp;
     int ret, tm;
+    u32 exceptions = 0;
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
     tm = vfp_single_type(&vsm);
     if (tm & (VFP_NAN|VFP_INFINITY)) {
         vsp = &vsd;
@@ -408,7 +409,9 @@ sqrt_invalid:
     }
     vsd.significand = vfp_shiftright32jamming(vsd.significand, 1);
 
-    return vfp_single_normaliseround(state, sd, &vsd, fpscr, 0, "fsqrt");
+    exceptions |= vfp_single_normaliseround(state, sd, &vsd, fpscr, 0, "fsqrt");
+
+    return exceptions;
 }
 
 /*
@@ -503,7 +506,7 @@ static u32 vfp_single_fcvtd(ARMul_State* state, int dd, int unused, s32 m, u32 f
     int tm;
     u32 exceptions = 0;
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
 
     tm = vfp_single_type(&vsm);
 
@@ -511,7 +514,7 @@ static u32 vfp_single_fcvtd(ARMul_State* state, int dd, int unused, s32 m, u32 f
      * If we have a signalling NaN, signal invalid operation.
      */
     if (tm == VFP_SNAN)
-        exceptions = FPSCR_IOC;
+        exceptions |= FPSCR_IOC;
 
     if (tm & VFP_DENORMAL)
         vfp_single_normalise_denormal(&vsm);
@@ -568,7 +571,7 @@ static u32 vfp_single_ftoui(ARMul_State* state, int sd, int unused, s32 m, u32 f
     int rmode = fpscr & FPSCR_RMODE_MASK;
     int tm;
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
     vfp_single_dump("VSM", &vsm);
 
     /*
@@ -583,7 +586,7 @@ static u32 vfp_single_ftoui(ARMul_State* state, int sd, int unused, s32 m, u32 f
 
     if (vsm.exponent >= 127 + 32) {
         d = vsm.sign ? 0 : 0xffffffff;
-        exceptions = FPSCR_IOC;
+        exceptions |= FPSCR_IOC;
     } else if (vsm.exponent >= 127) {
         int shift = 127 + 31 - vsm.exponent;
         u32 rem, incr = 0;
@@ -648,7 +651,7 @@ static u32 vfp_single_ftosi(ARMul_State* state, int sd, int unused, s32 m, u32 f
     int rmode = fpscr & FPSCR_RMODE_MASK;
     int tm;
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
     vfp_single_dump("VSM", &vsm);
 
     /*
@@ -774,7 +777,7 @@ vfp_single_fadd_nonnumber(struct vfp_single *vsd, struct vfp_single *vsn,
             /*
              * different signs -> invalid
              */
-            exceptions = FPSCR_IOC;
+            exceptions |= FPSCR_IOC;
             vsp = &vfp_single_default_qnan;
         } else {
             /*
@@ -921,27 +924,27 @@ static u32
 vfp_single_multiply_accumulate(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr, u32 negate, const char *func)
 {
     vfp_single vsd, vsp, vsn, vsm;
-    u32 exceptions;
+    u32 exceptions = 0;
     s32 v;
 
     v = vfp_get_float(state, sn);
     LOG_TRACE(Core_ARM11, "s%u = %08x", sn, v);
-    vfp_single_unpack(&vsn, v, &fpscr);
+    exceptions |= vfp_single_unpack(&vsn, v, fpscr);
     if (vsn.exponent == 0 && vsn.significand)
         vfp_single_normalise_denormal(&vsn);
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
     if (vsm.exponent == 0 && vsm.significand)
         vfp_single_normalise_denormal(&vsm);
 
-    exceptions = vfp_single_multiply(&vsp, &vsn, &vsm, fpscr);
+    exceptions |= vfp_single_multiply(&vsp, &vsn, &vsm, fpscr);
 
     if (negate & NEG_MULTIPLY)
         vsp.sign = vfp_sign_negate(vsp.sign);
 
     v = vfp_get_float(state, sd);
     LOG_TRACE(Core_ARM11, "s%u = %08x", sd, v);
-    vfp_single_unpack(&vsn, v, &fpscr);
+    exceptions |= vfp_single_unpack(&vsn, v, fpscr);
     if (vsn.exponent == 0 && vsn.significand != 0)
         vfp_single_normalise_denormal(&vsn);
 
@@ -1000,20 +1003,20 @@ static u32 vfp_single_fnmsc(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr
 static u32 vfp_single_fmul(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
 {
     struct vfp_single vsd, vsn, vsm;
-    u32 exceptions;
+    u32 exceptions = 0;
     s32 n = vfp_get_float(state, sn);
 
     LOG_TRACE(Core_ARM11, "s%u = %08x", sn, n);
 
-    vfp_single_unpack(&vsn, n, &fpscr);
+    exceptions |= vfp_single_unpack(&vsn, n, fpscr);
     if (vsn.exponent == 0 && vsn.significand)
         vfp_single_normalise_denormal(&vsn);
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
     if (vsm.exponent == 0 && vsm.significand)
         vfp_single_normalise_denormal(&vsm);
 
-    exceptions = vfp_single_multiply(&vsd, &vsn, &vsm, fpscr);
+    exceptions |= vfp_single_multiply(&vsd, &vsn, &vsm, fpscr);
     return vfp_single_normaliseround(state, sd, &vsd, fpscr, exceptions, "fmul");
 }
 
@@ -1023,20 +1026,20 @@ static u32 vfp_single_fmul(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
 static u32 vfp_single_fnmul(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
 {
     struct vfp_single vsd, vsn, vsm;
-    u32 exceptions;
+    u32 exceptions = 0;
     s32 n = vfp_get_float(state, sn);
 
     LOG_TRACE(Core_ARM11, "s%u = %08x", sn, n);
 
-    vfp_single_unpack(&vsn, n, &fpscr);
+    exceptions |= vfp_single_unpack(&vsn, n, fpscr);
     if (vsn.exponent == 0 && vsn.significand)
         vfp_single_normalise_denormal(&vsn);
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
     if (vsm.exponent == 0 && vsm.significand)
         vfp_single_normalise_denormal(&vsm);
 
-    exceptions = vfp_single_multiply(&vsd, &vsn, &vsm, fpscr);
+    exceptions |= vfp_single_multiply(&vsd, &vsn, &vsm, fpscr);
     vsd.sign = vfp_sign_negate(vsd.sign);
     return vfp_single_normaliseround(state, sd, &vsd, fpscr, exceptions, "fnmul");
 }
@@ -1047,7 +1050,7 @@ static u32 vfp_single_fnmul(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr
 static u32 vfp_single_fadd(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
 {
     struct vfp_single vsd, vsn, vsm;
-    u32 exceptions;
+    u32 exceptions = 0;
     s32 n = vfp_get_float(state, sn);
 
     LOG_TRACE(Core_ARM11, "s%u = %08x", sn, n);
@@ -1055,15 +1058,15 @@ static u32 vfp_single_fadd(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
     /*
      * Unpack and normalise denormals.
      */
-    vfp_single_unpack(&vsn, n, &fpscr);
+    exceptions |= vfp_single_unpack(&vsn, n, fpscr);
     if (vsn.exponent == 0 && vsn.significand)
         vfp_single_normalise_denormal(&vsn);
 
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
     if (vsm.exponent == 0 && vsm.significand)
         vfp_single_normalise_denormal(&vsm);
 
-    exceptions = vfp_single_add(&vsd, &vsn, &vsm, fpscr);
+    exceptions |= vfp_single_add(&vsd, &vsn, &vsm, fpscr);
 
     return vfp_single_normaliseround(state, sd, &vsd, fpscr, exceptions, "fadd");
 }
@@ -1095,8 +1098,8 @@ static u32 vfp_single_fdiv(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
 
     LOG_TRACE(Core_ARM11, "s%u = %08x", sn, n);
 
-    vfp_single_unpack(&vsn, n, &fpscr);
-    vfp_single_unpack(&vsm, m, &fpscr);
+    exceptions |= vfp_single_unpack(&vsn, n, fpscr);
+    exceptions |= vfp_single_unpack(&vsm, m, fpscr);
 
     vsd.sign = vsn.sign ^ vsm.sign;
 
@@ -1165,13 +1168,13 @@ static u32 vfp_single_fdiv(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
     return vfp_single_normaliseround(state, sd, &vsd, fpscr, 0, "fdiv");
 
 vsn_nan:
-    exceptions = vfp_propagate_nan(&vsd, &vsn, &vsm, fpscr);
+    exceptions |= vfp_propagate_nan(&vsd, &vsn, &vsm, fpscr);
 pack:
     vfp_put_float(state, vfp_single_pack(&vsd), sd);
     return exceptions;
 
 vsm_nan:
-    exceptions = vfp_propagate_nan(&vsd, &vsm, &vsn, fpscr);
+    exceptions |= vfp_propagate_nan(&vsd, &vsm, &vsn, fpscr);
     goto pack;
 
 zero:
@@ -1180,7 +1183,7 @@ zero:
     goto pack;
 
 divzero:
-    exceptions = FPSCR_DZC;
+    exceptions |= FPSCR_DZC;
 infinity:
     vsd.exponent = 255;
     vsd.significand = 0;