target/loongarch: Add floating point comparison instruction translation

This includes:
- FCMP.cond.{S/D}

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-12-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/target/loongarch/insn_trans/trans_fcmp.c.inc b/target/loongarch/insn_trans/trans_fcmp.c.inc
new file mode 100644
index 0000000000..93a6a2230f
--- /dev/null
+++ b/target/loongarch/insn_trans/trans_fcmp.c.inc
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ */
+
+/* bit0(signaling/quiet) bit1(lt) bit2(eq) bit3(un) bit4(neq) */
+static uint32_t get_fcmp_flags(int cond)
+{
+    uint32_t flags = 0;
+
+    if (cond & 0x1) {
+        flags |= FCMP_LT;
+    }
+    if (cond & 0x2) {
+        flags |= FCMP_EQ;
+    }
+    if (cond & 0x4) {
+        flags |= FCMP_UN;
+    }
+    if (cond & 0x8) {
+        flags |= FCMP_GT | FCMP_LT;
+    }
+    return flags;
+}
+
+static bool trans_fcmp_cond_s(DisasContext *ctx, arg_fcmp_cond_s *a)
+{
+    TCGv var = tcg_temp_new();
+    uint32_t flags;
+    void (*fn)(TCGv, TCGv_env, TCGv, TCGv, TCGv_i32);
+
+    fn = (a->fcond & 1 ? gen_helper_fcmp_s_s : gen_helper_fcmp_c_s);
+    flags = get_fcmp_flags(a->fcond >> 1);
+
+    fn(var, cpu_env, cpu_fpr[a->fj], cpu_fpr[a->fk], tcg_constant_i32(flags));
+
+    tcg_gen_st8_tl(var, cpu_env, offsetof(CPULoongArchState, cf[a->cd]));
+    tcg_temp_free(var);
+    return true;
+}
+
+static bool trans_fcmp_cond_d(DisasContext *ctx, arg_fcmp_cond_d *a)
+{
+    TCGv var = tcg_temp_new();
+    uint32_t flags;
+    void (*fn)(TCGv, TCGv_env, TCGv, TCGv, TCGv_i32);
+    fn = (a->fcond & 1 ? gen_helper_fcmp_s_d : gen_helper_fcmp_c_d);
+    flags = get_fcmp_flags(a->fcond >> 1);
+
+    fn(var, cpu_env, cpu_fpr[a->fj], cpu_fpr[a->fk], tcg_constant_i32(flags));
+
+    tcg_gen_st8_tl(var, cpu_env, offsetof(CPULoongArchState, cf[a->cd]));
+
+    tcg_temp_free(var);
+    return true;
+}