[v3,48/69] target/arm: Introduce clear_vec

Commit Message

Richard Henderson Dec. 11, 2024, 4:30 p.m. UTC

In a couple of places, clearing the entire vector before storing one
element is the easiest solution.  Wrap that into a helper function.

Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
Signed-off-by: Richard Henderson <[e-mail]>
---
 target/arm/tcg/translate-a64.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

Patch

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 717d30dd5b..0e8e867058 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -628,7 +628,16 @@  static TCGv_i32 read_fp_hreg(DisasContext *s, int reg)
     return v;
 }
 
-/* Clear the bits above an N-bit vector, for N = (is_q ? 128 : 64).
+static void clear_vec(DisasContext *s, int rd)
+{
+    unsigned ofs = fp_reg_offset(s, rd, MO_64);
+    unsigned vsz = vec_full_reg_size(s);
+
+    tcg_gen_gvec_dup_imm(MO_64, ofs, vsz, vsz, 0);
+}
+
+/*
+ * Clear the bits above an N-bit vector, for N = (is_q ? 128 : 64).
  * If SVE is not enabled, then there are only 128 bits in the vector.
  */
 static void clear_vec_high(DisasContext *s, bool is_q, int rd)
@@ -4851,7 +4860,6 @@  static bool trans_SM3SS1(DisasContext *s, arg_SM3SS1 *a)
         TCGv_i32 tcg_op2 = tcg_temp_new_i32();
         TCGv_i32 tcg_op3 = tcg_temp_new_i32();
         TCGv_i32 tcg_res = tcg_temp_new_i32();
-        unsigned vsz, dofs;
 
         read_vec_element_i32(s, tcg_op1, a->rn, 3, MO_32);
         read_vec_element_i32(s, tcg_op2, a->rm, 3, MO_32);
@@ -4863,9 +4871,7 @@  static bool trans_SM3SS1(DisasContext *s, arg_SM3SS1 *a)
         tcg_gen_rotri_i32(tcg_res, tcg_res, 25);
 
         /* Clear the whole register first, then store bits [127:96]. */
-        vsz = vec_full_reg_size(s);
-        dofs = vec_full_reg_offset(s, a->rd);
-        tcg_gen_gvec_dup_imm(MO_64, dofs, vsz, vsz, 0);
+        clear_vec(s, a->rd);
         write_vec_element_i32(s, tcg_res, a->rd, 3, MO_32);
     }
     return true;
@@ -6307,7 +6313,6 @@  static bool do_scalar_muladd_widening_idx(DisasContext *s, arg_rrx_e *a,
         TCGv_i64 t0 = tcg_temp_new_i64();
         TCGv_i64 t1 = tcg_temp_new_i64();
         TCGv_i64 t2 = tcg_temp_new_i64();
-        unsigned vsz, dofs;
 
         if (acc) {
             read_vec_element(s, t0, a->rd, 0, a->esz + 1);
@@ -6317,9 +6322,7 @@  static bool do_scalar_muladd_widening_idx(DisasContext *s, arg_rrx_e *a,
         fn(t0, t1, t2);
 
         /* Clear the whole register first, then store scalar. */
-        vsz = vec_full_reg_size(s);
-        dofs = vec_full_reg_offset(s, a->rd);
-        tcg_gen_gvec_dup_imm(MO_64, dofs, vsz, vsz, 0);
+        clear_vec(s, a->rd);
         write_vec_element(s, t0, a->rd, 0, a->esz + 1);
     }
     return true;