[PATCH v5 4/8] target/riscv: zfh: half-precision floating-point compare

[frank.chang@sifive.com]

From: Kito Cheng <kito.cheng@sifive.com>

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>
---
 target/riscv/fpu_helper.c                 | 21 +++++++++++++
 target/riscv/helper.h                     |  3 ++
 target/riscv/insn32.decode                |  3 ++
 target/riscv/insn_trans/trans_rvzfh.c.inc | 37 +++++++++++++++++++++++
 4 files changed, 64 insertions(+)

diff --git a/target/riscv/fpu_helper.c b/target/riscv/fpu_helper.c
index 2ed9b03193c..ec2009ee65b 100644
--- a/target/riscv/fpu_helper.c
+++ b/target/riscv/fpu_helper.c
@@ -461,6 +461,27 @@ uint64_t helper_fsqrt_h(CPURISCVState *env, uint64_t rs1)
     return nanbox_h(float16_sqrt(frs1, &env->fp_status));
 }
 
+target_ulong helper_fle_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
+{
+    float16 frs1 = check_nanbox_h(rs1);
+    float16 frs2 = check_nanbox_h(rs2);
+    return float16_le(frs1, frs2, &env->fp_status);
+}
+
+target_ulong helper_flt_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
+{
+    float16 frs1 = check_nanbox_h(rs1);
+    float16 frs2 = check_nanbox_h(rs2);
+    return float16_lt(frs1, frs2, &env->fp_status);
+}
+
+target_ulong helper_feq_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
+{
+    float16 frs1 = check_nanbox_h(rs1);
+    float16 frs2 = check_nanbox_h(rs2);
+    return float16_eq_quiet(frs1, frs2, &env->fp_status);
+}
+
 target_ulong helper_fcvt_w_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(rs1);
diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index b50672d1684..9c89521d4ad 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -74,6 +74,9 @@ DEF_HELPER_FLAGS_3(fdiv_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
 DEF_HELPER_FLAGS_3(fmin_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
 DEF_HELPER_FLAGS_3(fmax_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
 DEF_HELPER_FLAGS_2(fsqrt_h, TCG_CALL_NO_RWG, i64, env, i64)
+DEF_HELPER_FLAGS_3(fle_h, TCG_CALL_NO_RWG, tl, env, i64, i64)
+DEF_HELPER_FLAGS_3(flt_h, TCG_CALL_NO_RWG, tl, env, i64, i64)
+DEF_HELPER_FLAGS_3(feq_h, TCG_CALL_NO_RWG, tl, env, i64, i64)
 DEF_HELPER_FLAGS_2(fcvt_s_h, TCG_CALL_NO_RWG, i64, env, i64)
 DEF_HELPER_FLAGS_2(fcvt_h_s, TCG_CALL_NO_RWG, i64, env, i64)
 DEF_HELPER_FLAGS_2(fcvt_d_h, TCG_CALL_NO_RWG, i64, env, i64)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index ba40f3e7f89..3906c9fb201 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -751,6 +751,9 @@ fcvt_d_h   0100001  00010 ..... ... ..... 1010011 @r2_rm
 fcvt_w_h   1100010  00000 ..... ... ..... 1010011 @r2_rm
 fcvt_wu_h  1100010  00001 ..... ... ..... 1010011 @r2_rm
 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
 fcvt_h_w   1101010  00000 ..... ... ..... 1010011 @r2_rm
 fcvt_h_wu  1101010  00001 ..... ... ..... 1010011 @r2_rm
 fmv_h_x    1111010  00000 ..... 000 ..... 1010011 @r2
diff --git a/target/riscv/insn_trans/trans_rvzfh.c.inc b/target/riscv/insn_trans/trans_rvzfh.c.inc
index d1250257666..8d0959a6671 100644
--- a/target/riscv/insn_trans/trans_rvzfh.c.inc
+++ b/target/riscv/insn_trans/trans_rvzfh.c.inc
@@ -335,6 +335,43 @@ static bool trans_fcvt_h_d(DisasContext *ctx, arg_fcvt_h_d *a)
     return true;
 }
 
+static bool trans_feq_h(DisasContext *ctx, arg_feq_h *a)
+{
+    REQUIRE_FPU;
+    REQUIRE_ZFH(ctx);
+
+    TCGv dest = dest_gpr(ctx, a->rd);
+
+    gen_helper_feq_h(dest, cpu_env, cpu_fpr[a->rs1], cpu_fpr[a->rs2]);
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
+static bool trans_flt_h(DisasContext *ctx, arg_flt_h *a)
+{
+    REQUIRE_FPU;
+    REQUIRE_ZFH(ctx);
+
+    TCGv dest = dest_gpr(ctx, a->rd);
+
+    gen_helper_flt_h(dest, cpu_env, cpu_fpr[a->rs1], cpu_fpr[a->rs2]);
+    gen_set_gpr(ctx, a->rd, dest);
+
+    return true;
+}
+
+static bool trans_fle_h(DisasContext *ctx, arg_fle_h *a)
+{
+    REQUIRE_FPU;
+    REQUIRE_ZFH(ctx);
+
+    TCGv dest = dest_gpr(ctx, a->rd);
+
+    gen_helper_fle_h(dest, cpu_env, cpu_fpr[a->rs1], cpu_fpr[a->rs2]);
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
 static bool trans_fcvt_w_h(DisasContext *ctx, arg_fcvt_w_h *a)
 {
     REQUIRE_FPU;
-- 
2.25.1