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target/mips/tx79: Introduce PEXTL[BHW] opcodes (Parallel Extend Lower) 

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 <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210309145653.743937-13-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2021-02-13 14:42:30 +01:00
parent 0bc6937296
commit a9ea77f2dc
2 changed files with 78 additions and 0 deletions
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3
target/mips/tcg/tx79.decode
View File

@ -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

75
target/mips/tcg/tx79_translate.c
View File

@ -297,6 +297,81 @@ static void gen_pextw(TCGv_i64 dl, TCGv_i64 dh, TCGv_i64 a, TCGv_i64 b)
tcg_gen_deposit_i64(dh, a, b, 0, 32);
}
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 half */
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 half */
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);
gen_pextw(cpu_gpr[a->rd], cpu_gpr_hi[a->rd], ax, bx);
tcg_temp_free(bx);
tcg_temp_free(ax);
return true;
}
/* Parallel Extend Upper from Word */
static bool trans_PEXTUW(DisasContext *ctx, arg_rtype *a)
{