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target/arm: Convert T16 add, compare, move (two high registers) 

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190904193059.26202-55-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-09-04 12:30:44 -07:00 committed by Peter Maydell
parent a0ef077404
commit 90aa042115
2 changed files with 12 additions and 47 deletions
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10
target/arm/t16.decode
View File

@ -146,6 +146,16 @@ CMP_xri 00101 ... ........ @arith_1i s=1
ADD_rri 00110 ... ........ @arith_1i %s
SUB_rri 00111 ... ........ @arith_1i %s
# Add, compare, move (two high registers)
%reg_0_7 7:1 0:3
@addsub_2h .... .... . rm:4 ... \
&s_rrr_shi rd=%reg_0_7 rn=%reg_0_7 shim=0 shty=0
ADD_rrri 0100 0100 . .... ... @addsub_2h s=0
CMP_xrri 0100 0101 . .... ... @addsub_2h s=1
MOV_rxri 0100 0110 . .... ... @addsub_2h s=0
# Branch and exchange
@branchr .... .... . rm:4 ... &r

49
target/arm/translate.c
View File

@ -10745,55 +10745,10 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
store_reg(s, rd, tmp);
break;
}
if (insn & (1 << 10)) {
/* 0b0100_01xx_xxxx_xxxx
* - data processing extended, branch and exchange
*/
rd = (insn & 7) | ((insn >> 4) & 8);
rm = (insn >> 3) & 0xf;
op = (insn >> 8) & 3;
switch (op) {
case 0: /* add */
tmp = load_reg(s, rd);
tmp2 = load_reg(s, rm);
tcg_gen_add_i32(tmp, tmp, tmp2);
tcg_temp_free_i32(tmp2);
if (rd == 13) {
/* ADD SP, SP, reg */
store_sp_checked(s, tmp);
} else {
store_reg(s, rd, tmp);
}
break;
case 1: /* cmp */
tmp = load_reg(s, rd);
tmp2 = load_reg(s, rm);
gen_sub_CC(tmp, tmp, tmp2);
tcg_temp_free_i32(tmp2);
tcg_temp_free_i32(tmp);
break;
case 2: /* mov/cpy */
tmp = load_reg(s, rm);
if (rd == 13) {
/* MOV SP, reg */
store_sp_checked(s, tmp);
} else {
store_reg(s, rd, tmp);
}
break;
case 3:
/* 0b0100_0111_xxxx_xxxx
* - branch [and link] exchange thumb register
* In decodetree
*/
goto illegal_op;
}
break;
}
/*
* 0b0100_00xx_xxxx_xxxx
* - Data-processing (two low registers), in decodetree
* - Data-processing (two low registers), in decodetree
* - data processing extended, branch and exchange, in decodetree
*/
goto illegal_op;