[v6,51/61] target/riscv: vmfirst find-first-set mask bit

Commit Message

LIU Zhiwei March 17, 2020, 3:06 p.m. UTC

Signed-off-by: LIU Zhiwei <[e-mail]>
Reviewed-by: Richard Henderson <[e-mail]>
---
 target/riscv/helper.h                   |  2 ++
 target/riscv/insn32.decode              |  1 +
 target/riscv/insn_trans/trans_rvv.inc.c | 32 +++++++++++++++++++++++++
 target/riscv/vector_helper.c            | 19 +++++++++++++++
 4 files changed, 54 insertions(+)

Patch

diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index e919c5e30b..ec6cf7d2a2 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -1093,3 +1093,5 @@  DEF_HELPER_6(vmornot_mm, void, ptr, ptr, ptr, ptr, env, i32)
 DEF_HELPER_6(vmxnor_mm, void, ptr, ptr, ptr, ptr, env, i32)
 
 DEF_HELPER_4(vmpopc_m, tl, ptr, ptr, env, i32)
+
+DEF_HELPER_4(vmfirst_m, tl, ptr, ptr, env, i32)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index decb7f773f..4c7706561a 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -554,6 +554,7 @@  vmnor_mm        011110 - ..... ..... 010 ..... 1010111 @r
 vmornot_mm      011100 - ..... ..... 010 ..... 1010111 @r
 vmxnor_mm       011111 - ..... ..... 010 ..... 1010111 @r
 vmpopc_m        010100 . ..... ----- 010 ..... 1010111 @r2_vm
+vmfirst_m       010101 . ..... ----- 010 ..... 1010111 @r2_vm
 
 vsetvli         0 ........... ..... 111 ..... 1010111  @r2_zimm
 vsetvl          1000000 ..... ..... 111 ..... 1010111  @r
diff --git a/target/riscv/insn_trans/trans_rvv.inc.c b/target/riscv/insn_trans/trans_rvv.inc.c
index c3d6042f82..3518049e68 100644
--- a/target/riscv/insn_trans/trans_rvv.inc.c
+++ b/target/riscv/insn_trans/trans_rvv.inc.c
@@ -2249,3 +2249,35 @@  static bool trans_vmpopc_m(DisasContext *s, arg_rmr *a)
     }
     return false;
 }
+
+/* vmfirst find-first-set mask bit */
+static bool trans_vmfirst_m(DisasContext *s, arg_rmr *a)
+{
+    if (vext_check_isa_ill(s)) {
+        TCGv_ptr src2, mask;
+        TCGv dst;
+        TCGv_i32 desc;
+        uint32_t data = 0;
+        data = FIELD_DP32(data, VDATA, MLEN, s->mlen);
+        data = FIELD_DP32(data, VDATA, VM, a->vm);
+        data = FIELD_DP32(data, VDATA, LMUL, s->lmul);
+
+        mask = tcg_temp_new_ptr();
+        src2 = tcg_temp_new_ptr();
+        dst = tcg_temp_new();
+        desc = tcg_const_i32(simd_desc(0, s->vlen / 8, data));
+
+        tcg_gen_addi_ptr(src2, cpu_env, vreg_ofs(s, a->rs2));
+        tcg_gen_addi_ptr(mask, cpu_env, vreg_ofs(s, 0));
+
+        gen_helper_vmfirst_m(dst, mask, src2, cpu_env, desc);
+        gen_set_gpr(a->rd, dst);
+
+        tcg_temp_free_ptr(mask);
+        tcg_temp_free_ptr(src2);
+        tcg_temp_free(dst);
+        tcg_temp_free_i32(desc);
+        return true;
+    }
+    return false;
+}
diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 829a39a8fe..f37bc1c0a0 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -4531,3 +4531,22 @@  target_ulong HELPER(vmpopc_m)(void *v0, void *vs2, CPURISCVState *env,
     }
     return cnt;
 }
+
+/* vmfirst find-first-set mask bit*/
+target_ulong HELPER(vmfirst_m)(void *v0, void *vs2, CPURISCVState *env,
+        uint32_t desc)
+{
+    uint32_t mlen = vext_mlen(desc);
+    uint32_t vm = vext_vm(desc);
+    uint32_t vl = env->vl;
+    int i;
+
+    for (i = 0; i < vl; i++) {
+        if (vm || vext_elem_mask(v0, mlen, i)) {
+            if (vext_elem_mask(vs2, mlen, i)) {
+                return i;
+            }
+        }
+    }
+    return -1LL;
+}