target-i386: add floatx_{add,mul,sub} and use them

Add floatx_{add,mul,sub} defines, and use them instead of using direct
C operations.
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

target-i386/exec.h

@@ -110,6 +110,9 @@ static inline void svm_check_intercept(uint32_t type)
 #define float64_to_floatx float64_to_floatx80
 #define floatx_to_float32 floatx80_to_float32
 #define floatx_to_float64 floatx80_to_float64
+#define floatx_add floatx80_add
+#define floatx_mul floatx80_mul
+#define floatx_sub floatx80_sub
 #define floatx_abs floatx80_abs
 #define floatx_chs floatx80_chs
 #define floatx_round_to_int floatx80_round_to_int
@@ -126,6 +129,9 @@ static inline void svm_check_intercept(uint32_t type)
 #define float64_to_floatx(x, e) (x)
 #define floatx_to_float32 float64_to_float32
 #define floatx_to_float64(x, e) (x)
+#define floatx_add float64_add
+#define floatx_mul float64_mul
+#define floatx_sub float64_sub
 #define floatx_abs float64_abs
 #define floatx_chs float64_chs
 #define floatx_round_to_int float64_round_to_int

target-i386/op_helper.c

@@ -3711,22 +3711,22 @@ void helper_fucomi_ST0_FT0(void)
 
 void helper_fadd_ST0_FT0(void)
 {
-    ST0 += FT0;
+    ST0 = floatx_add(ST0, FT0, &env->fp_status);
 }
 
 void helper_fmul_ST0_FT0(void)
 {
-    ST0 *= FT0;
+    ST0 = floatx_mul(ST0, FT0, &env->fp_status);
 }
 
 void helper_fsub_ST0_FT0(void)
 {
-    ST0 -= FT0;
+    ST0 = floatx_sub(ST0, FT0, &env->fp_status);
 }
 
 void helper_fsubr_ST0_FT0(void)
 {
-    ST0 = FT0 - ST0;
+    ST0 = floatx_sub(FT0, ST0, &env->fp_status);
 }
 
 void helper_fdiv_ST0_FT0(void)
@@ -3743,24 +3743,22 @@ void helper_fdivr_ST0_FT0(void)
 
 void helper_fadd_STN_ST0(int st_index)
 {
-    ST(st_index) += ST0;
+    ST(st_index) = floatx_add(ST(st_index), ST0, &env->fp_status);
 }
 
 void helper_fmul_STN_ST0(int st_index)
 {
-    ST(st_index) *= ST0;
+    ST(st_index) = floatx_mul(ST(st_index), ST0, &env->fp_status);
 }
 
 void helper_fsub_STN_ST0(int st_index)
 {
-    ST(st_index) -= ST0;
+    ST(st_index) = floatx_sub(ST(st_index), ST0, &env->fp_status);
 }
 
 void helper_fsubr_STN_ST0(int st_index)
 {
-    CPU86_LDouble *p;
-    p = &ST(st_index);
-    *p = ST0 - *p;
+    ST(st_index) = floatx_sub(ST0, ST(st_index), &env->fp_status);
 }
 
 void helper_fdiv_STN_ST0(int st_index)