target/arm: Convert SSHLL, USHLL to decodetree
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240912024114.1097832-20-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index 77b860a..bf67f8a 100644
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -1269,3 +1269,11 @@
SLI_v 0.10 11110 .... ... 01010 1 ..... ..... @q_shli_h
SLI_v 0.10 11110 .... ... 01010 1 ..... ..... @q_shli_s
SLI_v 0.10 11110 .... ... 01010 1 ..... ..... @q_shli_d
+
+SSHLL_v 0.00 11110 .... ... 10100 1 ..... ..... @q_shli_b
+SSHLL_v 0.00 11110 .... ... 10100 1 ..... ..... @q_shli_h
+SSHLL_v 0.00 11110 .... ... 10100 1 ..... ..... @q_shli_s
+
+USHLL_v 0.10 11110 .... ... 10100 1 ..... ..... @q_shli_b
+USHLL_v 0.10 11110 .... ... 10100 1 ..... ..... @q_shli_h
+USHLL_v 0.10 11110 .... ... 10100 1 ..... ..... @q_shli_s
diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 7406200..e00d7fb 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -6983,6 +6983,42 @@
TRANS(SHL_v, do_vec_shift_imm, a, tcg_gen_gvec_shli)
TRANS(SLI_v, do_vec_shift_imm, a, gen_gvec_sli);
+static bool do_vec_shift_imm_wide(DisasContext *s, arg_qrri_e *a, bool is_u)
+{
+ TCGv_i64 tcg_rn, tcg_rd;
+ int esz = a->esz;
+ int esize;
+
+ if (!fp_access_check(s)) {
+ return true;
+ }
+
+ /*
+ * For the LL variants the store is larger than the load,
+ * so if rd == rn we would overwrite parts of our input.
+ * So load everything right now and use shifts in the main loop.
+ */
+ tcg_rd = tcg_temp_new_i64();
+ tcg_rn = tcg_temp_new_i64();
+ read_vec_element(s, tcg_rn, a->rn, a->q, MO_64);
+
+ esize = 8 << esz;
+ for (int i = 0, elements = 8 >> esz; i < elements; i++) {
+ if (is_u) {
+ tcg_gen_extract_i64(tcg_rd, tcg_rn, i * esize, esize);
+ } else {
+ tcg_gen_sextract_i64(tcg_rd, tcg_rn, i * esize, esize);
+ }
+ tcg_gen_shli_i64(tcg_rd, tcg_rd, a->imm);
+ write_vec_element(s, tcg_rd, a->rd, i, esz + 1);
+ }
+ clear_vec_high(s, true, a->rd);
+ return true;
+}
+
+TRANS(SSHLL_v, do_vec_shift_imm_wide, a, false)
+TRANS(USHLL_v, do_vec_shift_imm_wide, a, true)
+
/* Shift a TCGv src by TCGv shift_amount, put result in dst.
* Note that it is the caller's responsibility to ensure that the
* shift amount is in range (ie 0..31 or 0..63) and provide the ARM
@@ -10447,47 +10483,6 @@
}
}
-/* USHLL/SHLL - Vector shift left with widening */
-static void handle_vec_simd_wshli(DisasContext *s, bool is_q, bool is_u,
- int immh, int immb, int opcode, int rn, int rd)
-{
- int size = 32 - clz32(immh) - 1;
- int immhb = immh << 3 | immb;
- int shift = immhb - (8 << size);
- int dsize = 64;
- int esize = 8 << size;
- int elements = dsize/esize;
- TCGv_i64 tcg_rn = tcg_temp_new_i64();
- TCGv_i64 tcg_rd = tcg_temp_new_i64();
- int i;
-
- if (size >= 3) {
- unallocated_encoding(s);
- return;
- }
-
- if (!fp_access_check(s)) {
- return;
- }
-
- /* For the LL variants the store is larger than the load,
- * so if rd == rn we would overwrite parts of our input.
- * So load everything right now and use shifts in the main loop.
- */
- read_vec_element(s, tcg_rn, rn, is_q ? 1 : 0, MO_64);
-
- for (i = 0; i < elements; i++) {
- if (is_u) {
- tcg_gen_extract_i64(tcg_rd, tcg_rn, i * esize, esize);
- } else {
- tcg_gen_sextract_i64(tcg_rd, tcg_rn, i * esize, esize);
- }
- tcg_gen_shli_i64(tcg_rd, tcg_rd, shift);
- write_vec_element(s, tcg_rd, rd, i, size + 1);
- }
- clear_vec_high(s, true, rd);
-}
-
/* SHRN/RSHRN - Shift right with narrowing (and potential rounding) */
static void handle_vec_simd_shrn(DisasContext *s, bool is_q,
int immh, int immb, int opcode, int rn, int rd)
@@ -10577,9 +10572,6 @@
handle_vec_simd_sqshrn(s, false, is_q, is_u, is_u, immh, immb,
opcode, rn, rd);
break;
- case 0x14: /* SSHLL / USHLL */
- handle_vec_simd_wshli(s, is_q, is_u, immh, immb, opcode, rn, rd);
- break;
case 0x1c: /* SCVTF / UCVTF */
handle_simd_shift_intfp_conv(s, false, is_q, is_u, immh, immb,
opcode, rn, rd);
@@ -10604,6 +10596,7 @@
case 0x06: /* SRSRA / URSRA (accum + rounding) */
case 0x08: /* SRI */
case 0x0a: /* SHL / SLI */
+ case 0x14: /* SSHLL / USHLL */
unallocated_encoding(s);
return;
}
