target/riscv: Generate nanboxed results from fp helpers

Make sure that all results from single-precision scalar helpers
are properly nan-boxed to 64-bits.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Message-Id: <20200724002807.441147-2-richard.henderson@linaro.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/fpu_helper.c

@@ -81,10 +81,16 @@ void helper_set_rounding_mode(CPURISCVState *env, uint32_t rm)
     set_float_rounding_mode(softrm, &env->fp_status);
 }
 
+static uint64_t do_fmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
+                           uint64_t frs3, int flags)
+{
+    return nanbox_s(float32_muladd(frs1, frs2, frs3, flags, &env->fp_status));
+}
+
 uint64_t helper_fmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
-    return float32_muladd(frs1, frs2, frs3, 0, &env->fp_status);
+    return do_fmadd_s(env, frs1, frs2, frs3, 0);
 }
 
 uint64_t helper_fmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
@@ -96,8 +102,7 @@ uint64_t helper_fmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
 uint64_t helper_fmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
-    return float32_muladd(frs1, frs2, frs3, float_muladd_negate_c,
+    return do_fmadd_s(env, frs1, frs2, frs3, float_muladd_negate_c);
-                          &env->fp_status);
 }
 
 uint64_t helper_fmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
@@ -110,8 +115,7 @@ uint64_t helper_fmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
 uint64_t helper_fnmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
-    return float32_muladd(frs1, frs2, frs3, float_muladd_negate_product,
+    return do_fmadd_s(env, frs1, frs2, frs3, float_muladd_negate_product);
-                          &env->fp_status);
 }
 
 uint64_t helper_fnmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
@@ -124,8 +128,8 @@ uint64_t helper_fnmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
 uint64_t helper_fnmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
-    return float32_muladd(frs1, frs2, frs3, float_muladd_negate_c |
+    return do_fmadd_s(env, frs1, frs2, frs3,
-                          float_muladd_negate_product, &env->fp_status);
+                      float_muladd_negate_c | float_muladd_negate_product);
 }
 
 uint64_t helper_fnmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
@@ -137,37 +141,37 @@ uint64_t helper_fnmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
 
 uint64_t helper_fadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
-    return float32_add(frs1, frs2, &env->fp_status);
+    return nanbox_s(float32_add(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
-    return float32_sub(frs1, frs2, &env->fp_status);
+    return nanbox_s(float32_sub(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmul_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
-    return float32_mul(frs1, frs2, &env->fp_status);
+    return nanbox_s(float32_mul(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fdiv_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
-    return float32_div(frs1, frs2, &env->fp_status);
+    return nanbox_s(float32_div(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmin_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
-    return float32_minnum(frs1, frs2, &env->fp_status);
+    return nanbox_s(float32_minnum(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmax_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
-    return float32_maxnum(frs1, frs2, &env->fp_status);
+    return nanbox_s(float32_maxnum(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fsqrt_s(CPURISCVState *env, uint64_t frs1)
 {
-    return float32_sqrt(frs1, &env->fp_status);
+    return nanbox_s(float32_sqrt(frs1, &env->fp_status));
 }
 
 target_ulong helper_fle_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
@@ -209,23 +213,23 @@ uint64_t helper_fcvt_lu_s(CPURISCVState *env, uint64_t frs1)
 
 uint64_t helper_fcvt_s_w(CPURISCVState *env, target_ulong rs1)
 {
-    return int32_to_float32((int32_t)rs1, &env->fp_status);
+    return nanbox_s(int32_to_float32((int32_t)rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_s_wu(CPURISCVState *env, target_ulong rs1)
 {
-    return uint32_to_float32((uint32_t)rs1, &env->fp_status);
+    return nanbox_s(uint32_to_float32((uint32_t)rs1, &env->fp_status));
 }
 
 #if defined(TARGET_RISCV64)
 uint64_t helper_fcvt_s_l(CPURISCVState *env, uint64_t rs1)
 {
-    return int64_to_float32(rs1, &env->fp_status);
+    return nanbox_s(int64_to_float32(rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_s_lu(CPURISCVState *env, uint64_t rs1)
 {
-    return uint64_to_float32(rs1, &env->fp_status);
+    return nanbox_s(uint64_to_float32(rs1, &env->fp_status));
 }
 #endif
 
@@ -266,7 +270,7 @@ uint64_t helper_fmax_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 
 uint64_t helper_fcvt_s_d(CPURISCVState *env, uint64_t rs1)
 {
-    return float64_to_float32(rs1, &env->fp_status);
+    return nanbox_s(float64_to_float32(rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_d_s(CPURISCVState *env, uint64_t rs1)

target/riscv/internals.h

@@ -38,4 +38,9 @@ target_ulong fclass_d(uint64_t frs1);
 #define SEW32 2
 #define SEW64 3
 
+static inline uint64_t nanbox_s(float32 f)
+{
+    return f | MAKE_64BIT_MASK(32, 32);
+}
+
 #endif