From 8a99e1bad25283b10c22a14e171ad119d2b8b4fd Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Tue, 3 Jul 2018 02:01:15 -0400
Subject: [PATCH] target/arm: Implement SVE load and broadcast quadword

Backports commit 05abe304be2987cb3576729a14dab96e9ccfaec9 from qemu
---
 qemu/target/arm/sve.decode      |  9 ++++++
 qemu/target/arm/translate-sve.c | 55 +++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/qemu/target/arm/sve.decode b/qemu/target/arm/sve.decode
index 7a993804..c7f4731f 100644
--- a/qemu/target/arm/sve.decode
+++ b/qemu/target/arm/sve.decode
@@ -715,6 +715,15 @@ LD_zprr         1010010 .. nreg:2 ..... 110 ... ..... .....     @rprr_load_msz
 # LD2B, LD2H, LD2W, LD2D; etc.
 LD_zpri         1010010 .. nreg:2 0.... 111 ... ..... .....     @rpri_load_msz
 
+# SVE load and broadcast quadword (scalar plus scalar)
+LD1RQ_zprr      1010010 .. 00 ..... 000 ... ..... ..... \
+                @rprr_load_msz nreg=0
+
+# SVE load and broadcast quadword (scalar plus immediate)
+# LD1RQB, LD1RQH, LD1RQS, LD1RQD
+LD1RQ_zpri      1010010 .. 00 0.... 001 ... ..... ..... \
+                @rpri_load_msz nreg=0
+
 ### SVE Memory Store Group
 
 # SVE contiguous store (scalar plus immediate)
diff --git a/qemu/target/arm/translate-sve.c b/qemu/target/arm/translate-sve.c
index 898c6a46..21372f2e 100644
--- a/qemu/target/arm/translate-sve.c
+++ b/qemu/target/arm/translate-sve.c
@@ -3865,6 +3865,61 @@ static bool trans_LDNF1_zpri(DisasContext *s, arg_rpri_load *a, uint32_t insn)
     return true;
 }
 
+static void do_ldrq(DisasContext *s, int zt, int pg, TCGv_i64 addr, int msz)
+{
+    TCGContext *tcg_ctx = s->uc->tcg_ctx;
+    static gen_helper_gvec_mem * const fns[4] = {
+        gen_helper_sve_ld1bb_r, gen_helper_sve_ld1hh_r,
+        gen_helper_sve_ld1ss_r, gen_helper_sve_ld1dd_r,
+    };
+    unsigned vsz = vec_full_reg_size(s);
+    TCGv_ptr t_pg;
+    TCGv_i32 desc;
+
+    /* Load the first quadword using the normal predicated load helpers.  */
+    desc = tcg_const_i32(tcg_ctx, simd_desc(16, 16, zt));
+    t_pg = tcg_temp_new_ptr(tcg_ctx);
+
+    tcg_gen_addi_ptr(tcg_ctx, t_pg, tcg_ctx->cpu_env, pred_full_reg_offset(s, pg));
+    fns[msz](tcg_ctx, tcg_ctx->cpu_env, t_pg, addr, desc);
+
+    tcg_temp_free_ptr(tcg_ctx, t_pg);
+    tcg_temp_free_i32(tcg_ctx, desc);
+
+    /* Replicate that first quadword.  */
+    if (vsz > 16) {
+        unsigned dofs = vec_full_reg_offset(s, zt);
+        tcg_gen_gvec_dup_mem(tcg_ctx, 4, dofs + 16, dofs, vsz - 16, vsz - 16);
+    }
+}
+
+static bool trans_LD1RQ_zprr(DisasContext *s, arg_rprr_load *a, uint32_t insn)
+{
+    if (a->rm == 31) {
+        return false;
+    }
+    if (sve_access_check(s)) {
+        TCGContext *tcg_ctx = s->uc->tcg_ctx;
+        int msz = dtype_msz(a->dtype);
+        TCGv_i64 addr = new_tmp_a64(s);
+        tcg_gen_shli_i64(tcg_ctx, addr, cpu_reg(s, a->rm), msz);
+        tcg_gen_add_i64(tcg_ctx, addr, addr, cpu_reg_sp(s, a->rn));
+        do_ldrq(s, a->rd, a->pg, addr, msz);
+    }
+    return true;
+}
+
+static bool trans_LD1RQ_zpri(DisasContext *s, arg_rpri_load *a, uint32_t insn)
+{
+    if (sve_access_check(s)) {
+        TCGContext *tcg_ctx = s->uc->tcg_ctx;
+        TCGv_i64 addr = new_tmp_a64(s);
+        tcg_gen_addi_i64(tcg_ctx, addr, cpu_reg_sp(s, a->rn), a->imm * 16);
+        do_ldrq(s, a->rd, a->pg, addr, dtype_msz(a->dtype));
+    }
+    return true;
+}
+
 static void do_st_zpa(DisasContext *s, int zt, int pg, TCGv_i64 addr,
                       int msz, int esz, int nreg)
 {