Introduce the 'Parallel Extend Lower' opcodes:
- PEXTLB (Parallel Extend Upper from Byte)
- PEXTLH (Parallel Extend Upper from Halfword)
- PEXTLW (Parallel Extend Upper from Word)
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
target/mips/tx79.decode | 3 ++
target/mips/tx79_translate.c | 78 ++++++++++++++++++++++++++++++++++++
2 files changed, 81 insertions(+)
diff --git a/target/mips/tx79.decode b/target/mips/tx79.decode
index ead5f8281e5..98f21d33e3f 100644
--- a/target/mips/tx79.decode
+++ b/target/mips/tx79.decode
@@ -34,6 +34,9 @@ MTLO1 011100 ..... 0000000000 00000 010011 @rs
PSUBW 011100 ..... ..... ..... 00001 001000 @rs_rt_rd
PSUBH 011100 ..... ..... ..... 00101 001000 @rs_rt_rd
PSUBB 011100 ..... ..... ..... 01001 001000 @rs_rt_rd
+PEXTLW 011100 ..... ..... ..... 10010 001000 @rs_rt_rd
+PEXTLH 011100 ..... ..... ..... 10110 001000 @rs_rt_rd
+PEXTLB 011100 ..... ..... ..... 11010 001000 @rs_rt_rd
# MMI1
diff --git a/target/mips/tx79_translate.c b/target/mips/tx79_translate.c
index 0a2fb28600b..11968d6edab 100644
--- a/target/mips/tx79_translate.c
+++ b/target/mips/tx79_translate.c
@@ -332,6 +332,84 @@ static bool trans_PNOR(DisasContext *ctx, arg_rtype *a)
* PEXTLW rd, rs, rt Parallel Extend Lower from Word
*/
+static bool trans_PEXTLx(DisasContext *ctx, arg_rtype *a, unsigned wlen)
+{
+ TCGv_i64 ax, bx;
+
+ if (a->rd == 0) {
+ /* nop */
+ return true;
+ }
+
+ ax = tcg_temp_new_i64();
+ bx = tcg_temp_new_i64();
+
+ gen_load_gpr(ax, a->rs);
+ gen_load_gpr(bx, a->rt);
+
+ /* Lower halve */
+ for (int i = 0; i < 64 / (2 * wlen); i++) {
+ tcg_gen_deposit_i64(cpu_gpr[a->rd],
+ cpu_gpr[a->rd], bx, 2 * wlen * i, wlen);
+ tcg_gen_deposit_i64(cpu_gpr[a->rd],
+ cpu_gpr[a->rd], ax, 2 * wlen * i + wlen, wlen);
+ tcg_gen_shri_i64(bx, bx, wlen);
+ tcg_gen_shri_i64(ax, ax, wlen);
+ }
+ /* Upper halve */
+ for (int i = 0; i < 64 / (2 * wlen); i++) {
+ tcg_gen_deposit_i64(cpu_gpr_hi[a->rd],
+ cpu_gpr_hi[a->rd], bx, 2 * wlen * i, wlen);
+ tcg_gen_deposit_i64(cpu_gpr_hi[a->rd],
+ cpu_gpr_hi[a->rd], ax, 2 * wlen * i + wlen, wlen);
+ tcg_gen_shri_i64(bx, bx, wlen);
+ tcg_gen_shri_i64(ax, ax, wlen);
+ }
+
+ tcg_temp_free(bx);
+ tcg_temp_free(ax);
+
+ return true;
+}
+
+/* Parallel Extend Lower from Byte */
+static bool trans_PEXTLB(DisasContext *ctx, arg_rtype *a)
+{
+ return trans_PEXTLx(ctx, a, 8);
+}
+
+/* Parallel Extend Lower from Halfword */
+static bool trans_PEXTLH(DisasContext *ctx, arg_rtype *a)
+{
+ return trans_PEXTLx(ctx, a, 16);
+}
+
+/* Parallel Extend Lower from Word */
+static bool trans_PEXTLW(DisasContext *ctx, arg_rtype *a)
+{
+ TCGv_i64 ax, bx;
+
+ if (a->rd == 0) {
+ /* nop */
+ return true;
+ }
+
+ ax = tcg_temp_new_i64();
+ bx = tcg_temp_new_i64();
+
+ gen_load_gpr(ax, a->rs);
+ gen_load_gpr(bx, a->rt);
+
+ tcg_gen_deposit_i64(cpu_gpr[a->rd], bx, ax, 32, 32);
+ tcg_gen_shri_i64(bx, bx, 32);
+ tcg_gen_deposit_i64(cpu_gpr_hi[a->rd], ax, bx, 0, 32);
+
+ tcg_temp_free(bx);
+ tcg_temp_free(ax);
+
+ return true;
+}
+
/* Parallel Extend Upper from Word */
static bool trans_PEXTUW(DisasContext *ctx, arg_rtype *a)
{
--
2.26.2
