rvv: fix vfm* and vfnm

 1. use fuesed mac since the precision is different
 2. remove reduncnt rounding mode and legal checking
 3. remove last exception generation
Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>

1 files changed, 9 insertions, 14 deletions

diff --git a/riscv/insns/vfmsub_vf.h b/riscv/insns/vfmsub_vf.h
index 44bb5ab..a85d267 100644
--- a/riscv/insns/vfmsub_vf.h
+++ b/riscv/insns/vfmsub_vf.h
@@ -1,19 +1,14 @@
 // vfmsub: vd[i] = +(vd[i] * f[rs1]) - vs2[i]
-require_fp;
-softfloat_roundingMode = STATE.VU.vxrm;
-float32_t mul_result;
-
 VFP_VF_LOOP
 ({
- switch(STATE.VU.vsew){
- case e32:
-    mul_result = f32_mul(vd, rs1);
-    vd = f32_sub(mul_result, vs2);
+  switch(STATE.VU.vsew){
+  case e32:
+    vd = f32_mulAdd(vd, rs1, f32(vs2.v ^ F32_SIGN));
     break;
- case e16:
- case e8:
- default:
-     softfloat_exceptionFlags = 1;
- };
+  case e16:
+  case e8:
+  default:
+    softfloat_exceptionFlags = 1;
+    break;
+  };
 })
-set_fp_exceptions;