target/arm: Implement SVE floating-point convert precision

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180627043328.11531-24-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c
index 79358c8..4b36c1e 100644
--- a/target/arm/sve_helper.c
+++ b/target/arm/sve_helper.c
@@ -3147,6 +3147,61 @@ void HELPER(NAME)(void *vd, void *vn, void *vg, void *status, uint32_t desc) \
     } while (i != 0);                                                 \
 }
 
+/* SVE fp16 conversions always use IEEE mode.  Like AdvSIMD, they ignore
+ * FZ16.  When converting from fp16, this affects flushing input denormals;
+ * when converting to fp16, this affects flushing output denormals.
+ */
+static inline float32 sve_f16_to_f32(float16 f, float_status *fpst)
+{
+    flag save = get_flush_inputs_to_zero(fpst);
+    float32 ret;
+
+    set_flush_inputs_to_zero(false, fpst);
+    ret = float16_to_float32(f, true, fpst);
+    set_flush_inputs_to_zero(save, fpst);
+    return ret;
+}
+
+static inline float64 sve_f16_to_f64(float16 f, float_status *fpst)
+{
+    flag save = get_flush_inputs_to_zero(fpst);
+    float64 ret;
+
+    set_flush_inputs_to_zero(false, fpst);
+    ret = float16_to_float64(f, true, fpst);
+    set_flush_inputs_to_zero(save, fpst);
+    return ret;
+}
+
+static inline float16 sve_f32_to_f16(float32 f, float_status *fpst)
+{
+    flag save = get_flush_to_zero(fpst);
+    float16 ret;
+
+    set_flush_to_zero(false, fpst);
+    ret = float32_to_float16(f, true, fpst);
+    set_flush_to_zero(save, fpst);
+    return ret;
+}
+
+static inline float16 sve_f64_to_f16(float64 f, float_status *fpst)
+{
+    flag save = get_flush_to_zero(fpst);
+    float16 ret;
+
+    set_flush_to_zero(false, fpst);
+    ret = float64_to_float16(f, true, fpst);
+    set_flush_to_zero(save, fpst);
+    return ret;
+}
+
+DO_ZPZ_FP(sve_fcvt_sh, uint32_t, H1_4, sve_f32_to_f16)
+DO_ZPZ_FP(sve_fcvt_hs, uint32_t, H1_4, sve_f16_to_f32)
+DO_ZPZ_FP(sve_fcvt_dh, uint64_t,     , sve_f64_to_f16)
+DO_ZPZ_FP(sve_fcvt_hd, uint64_t,     , sve_f16_to_f64)
+DO_ZPZ_FP(sve_fcvt_ds, uint64_t,     , float64_to_float32)
+DO_ZPZ_FP(sve_fcvt_sd, uint64_t,     , float32_to_float64)
+
 DO_ZPZ_FP(sve_scvt_hh, uint16_t, H1_2, int16_to_float16)
 DO_ZPZ_FP(sve_scvt_sh, uint32_t, H1_4, int32_to_float16)
 DO_ZPZ_FP(sve_scvt_ss, uint32_t, H1_4, int32_to_float32)