target/arm: Implement VFP fp16 for fused-multiply-add

Implement VFP fp16 support for fused multiply-add insns
VFNMA, VFNMS, VFMA, VFMS.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200828183354.27913-7-peter.maydell@linaro.org

1 files changed, 7 insertions, 0 deletions

diff --git a/target/arm/vfp_helper.c b/target/arm/vfp_helper.c
index f93ddf0b20..579ca3832d 100644
--- a/target/arm/vfp_helper.c
+++ b/target/arm/vfp_helper.c
@@ -1062,6 +1062,13 @@ uint32_t HELPER(rsqrte_u32)(uint32_t a)
 }
 
 /* VFPv4 fused multiply-accumulate */
+dh_ctype_f16 VFP_HELPER(muladd, h)(dh_ctype_f16 a, dh_ctype_f16 b,
+                                   dh_ctype_f16 c, void *fpstp)
+{
+    float_status *fpst = fpstp;
+    return float16_muladd(a, b, c, 0, fpst);
+}
+
 float32 VFP_HELPER(muladd, s)(float32 a, float32 b, float32 c, void *fpstp)
 {
     float_status *fpst = fpstp;