target/riscv: zfh: half-precision floating-point classify

Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>
Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20211210074329.5775-6-frank.chang@sifive.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/fpu_helper.c

@@ -482,6 +482,12 @@ target_ulong helper_feq_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
     return float16_eq_quiet(frs1, frs2, &env->fp_status);
 }
 
+target_ulong helper_fclass_h(uint64_t rs1)
+{
+    float16 frs1 = check_nanbox_h(rs1);
+    return fclass_h(frs1);
+}
+
 target_ulong helper_fcvt_w_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(rs1);

target/riscv/helper.h

@@ -89,6 +89,7 @@ DEF_HELPER_FLAGS_2(fcvt_h_w, TCG_CALL_NO_RWG, i64, env, tl)
 DEF_HELPER_FLAGS_2(fcvt_h_wu, TCG_CALL_NO_RWG, i64, env, tl)
 DEF_HELPER_FLAGS_2(fcvt_h_l, TCG_CALL_NO_RWG, i64, env, tl)
 DEF_HELPER_FLAGS_2(fcvt_h_lu, TCG_CALL_NO_RWG, i64, env, tl)
+DEF_HELPER_FLAGS_1(fclass_h, TCG_CALL_NO_RWG_SE, tl, i64)
 
 /* Special functions */
 DEF_HELPER_2(csrr, tl, env, int)

target/riscv/insn32.decode

@@ -754,6 +754,7 @@ fmv_x_h    1110010  00000 ..... 000 ..... 1010011 @r2
 feq_h      1010010  ..... ..... 010 ..... 1010011 @r
 flt_h      1010010  ..... ..... 001 ..... 1010011 @r
 fle_h      1010010  ..... ..... 000 ..... 1010011 @r
+fclass_h   1110010  00000 ..... 001 ..... 1010011 @r2
 fcvt_h_w   1101010  00000 ..... ... ..... 1010011 @r2_rm
 fcvt_h_wu  1101010  00001 ..... ... ..... 1010011 @r2_rm
 fmv_h_x    1111010  00000 ..... 000 ..... 1010011 @r2

target/riscv/insn_trans/trans_rvzfh.c.inc

@@ -372,6 +372,18 @@ static bool trans_fle_h(DisasContext *ctx, arg_fle_h *a)
     return true;
 }
 
+static bool trans_fclass_h(DisasContext *ctx, arg_fclass_h *a)
+{
+    REQUIRE_FPU;
+    REQUIRE_ZFH(ctx);
+
+    TCGv dest = dest_gpr(ctx, a->rd);
+
+    gen_helper_fclass_h(dest, cpu_fpr[a->rs1]);
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
 static bool trans_fcvt_w_h(DisasContext *ctx, arg_fcvt_w_h *a)
 {
     REQUIRE_FPU;