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tcg/aarch64: Implement INDEX_op_rotl{i,v}_vec 

For immediate rotate , we can implement this in two instructions,
using SLI.  For variable rotate, the oddness of aarch64 right-shift-
as-negative-left-shift means a backend-specific expansion works best.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-04-20 04:03:09 +00:00
parent 885b1706df
commit 7cff8988fa
2 changed files with 52 additions and 2 deletions
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53
tcg/aarch64/tcg-target.inc.c
View File

@ -557,6 +557,7 @@ typedef enum {
I3614_SSHR = 0x0f000400,
I3614_SSRA = 0x0f001400,
I3614_SHL = 0x0f005400,
I3614_SLI = 0x2f005400,
I3614_USHR = 0x2f000400,
I3614_USRA = 0x2f001400,
@ -2411,6 +2412,9 @@ static void tcg_out_vec_op(TCGContext *s, TCGOpcode opc,
case INDEX_op_sari_vec:
tcg_out_insn(s, 3614, SSHR, is_q, a0, a1, (16 << vece) - a2);
break;
case INDEX_op_aa64_sli_vec:
tcg_out_insn(s, 3614, SLI, is_q, a0, a2, args[3] + (8 << vece));
break;
case INDEX_op_shlv_vec:
tcg_out_insn(s, 3616, USHL, is_q, vece, a0, a1, a2);
break;
@ -2498,8 +2502,11 @@ int tcg_can_emit_vec_op(TCGOpcode opc, TCGType type, unsigned vece)
case INDEX_op_shlv_vec:
case INDEX_op_bitsel_vec:
return 1;
case INDEX_op_rotli_vec:
case INDEX_op_shrv_vec:
case INDEX_op_sarv_vec:
case INDEX_op_rotlv_vec:
case INDEX_op_rotrv_vec:
return -1;
case INDEX_op_mul_vec:
case INDEX_op_smax_vec:
@ -2517,14 +2524,24 @@ void tcg_expand_vec_op(TCGOpcode opc, TCGType type, unsigned vece,
TCGArg a0, ...)
{
va_list va;
TCGv_vec v0, v1, v2, t1;
TCGv_vec v0, v1, v2, t1, t2;
TCGArg a2;
va_start(va, a0);
v0 = temp_tcgv_vec(arg_temp(a0));
v1 = temp_tcgv_vec(arg_temp(va_arg(va, TCGArg)));
v2 = temp_tcgv_vec(arg_temp(va_arg(va, TCGArg)));
a2 = va_arg(va, TCGArg);
v2 = temp_tcgv_vec(arg_temp(a2));
switch (opc) {
case INDEX_op_rotli_vec:
t1 = tcg_temp_new_vec(type);
tcg_gen_shri_vec(vece, t1, v1, -a2 & ((8 << vece) - 1));
vec_gen_4(INDEX_op_aa64_sli_vec, type, vece,
tcgv_vec_arg(v0), tcgv_vec_arg(t1), tcgv_vec_arg(v1), a2);
tcg_temp_free_vec(t1);
break;
case INDEX_op_shrv_vec:
case INDEX_op_sarv_vec:
/* Right shifts are negative left shifts for AArch64. */
@ -2537,6 +2554,35 @@ void tcg_expand_vec_op(TCGOpcode opc, TCGType type, unsigned vece,
tcg_temp_free_vec(t1);
break;
case INDEX_op_rotlv_vec:
t1 = tcg_temp_new_vec(type);
tcg_gen_dupi_vec(vece, t1, 8 << vece);
tcg_gen_sub_vec(vece, t1, v2, t1);
/* Right shifts are negative left shifts for AArch64. */
vec_gen_3(INDEX_op_shlv_vec, type, vece, tcgv_vec_arg(t1),
tcgv_vec_arg(v1), tcgv_vec_arg(t1));
vec_gen_3(INDEX_op_shlv_vec, type, vece, tcgv_vec_arg(v0),
tcgv_vec_arg(v1), tcgv_vec_arg(v2));
tcg_gen_or_vec(vece, v0, v0, t1);
tcg_temp_free_vec(t1);
break;
case INDEX_op_rotrv_vec:
t1 = tcg_temp_new_vec(type);
t2 = tcg_temp_new_vec(type);
tcg_gen_neg_vec(vece, t1, v2);
tcg_gen_dupi_vec(vece, t2, 8 << vece);
tcg_gen_add_vec(vece, t2, t1, t2);
/* Right shifts are negative left shifts for AArch64. */
vec_gen_3(INDEX_op_shlv_vec, type, vece, tcgv_vec_arg(t1),
tcgv_vec_arg(v1), tcgv_vec_arg(t1));
vec_gen_3(INDEX_op_shlv_vec, type, vece, tcgv_vec_arg(t2),
tcgv_vec_arg(v1), tcgv_vec_arg(t2));
tcg_gen_or_vec(vece, v0, t1, t2);
tcg_temp_free_vec(t1);
tcg_temp_free_vec(t2);
break;
default:
g_assert_not_reached();
}
@ -2557,6 +2603,7 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
static const TCGTargetOpDef lZ_l = { .args_ct_str = { "lZ", "l" } };
static const TCGTargetOpDef r_r_r = { .args_ct_str = { "r", "r", "r" } };
static const TCGTargetOpDef w_w_w = { .args_ct_str = { "w", "w", "w" } };
static const TCGTargetOpDef w_0_w = { .args_ct_str = { "w", "0", "w" } };
static const TCGTargetOpDef w_w_wO = { .args_ct_str = { "w", "w", "wO" } };
static const TCGTargetOpDef w_w_wN = { .args_ct_str = { "w", "w", "wN" } };
static const TCGTargetOpDef w_w_wZ = { .args_ct_str = { "w", "w", "wZ" } };
@ -2751,6 +2798,8 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
return &w_w_wZ;
case INDEX_op_bitsel_vec:
return &w_w_w_w;
case INDEX_op_aa64_sli_vec:
return &w_0_w;
default:
return NULL;

1
tcg/aarch64/tcg-target.opc.h
View File

@ -12,3 +12,4 @@
*/
DEF(aa64_sshl_vec, 1, 2, 0, IMPLVEC)
DEF(aa64_sli_vec, 1, 2, 1, IMPLVEC)