From cc73bbded0dfb5612b0e416f7eda13a66950542a Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 19 Oct 2020 16:12:54 +0100 Subject: target/arm: Implement v8.1M conditional-select insns v8.1M brings four new insns to M-profile: * CSEL : Rd = cond ? Rn : Rm * CSINC : Rd = cond ? Rn : Rm+1 * CSINV : Rd = cond ? Rn : ~Rm * CSNEG : Rd = cond ? Rn : -Rm Implement these. Reviewed-by: Richard Henderson Signed-off-by: Peter Maydell Message-id: 20201019151301.2046-4-peter.maydell@linaro.org --- target/arm/translate.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) (limited to 'target/arm/translate.c') diff --git a/target/arm/translate.c b/target/arm/translate.c index d8729e42c4..9f2201ca57 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -8262,6 +8262,66 @@ static bool trans_IT(DisasContext *s, arg_IT *a) return true; } +/* v8.1M CSEL/CSINC/CSNEG/CSINV */ +static bool trans_CSEL(DisasContext *s, arg_CSEL *a) +{ + TCGv_i32 rn, rm, zero; + DisasCompare c; + + if (!arm_dc_feature(s, ARM_FEATURE_V8_1M)) { + return false; + } + + if (a->rm == 13) { + /* SEE "Related encodings" (MVE shifts) */ + return false; + } + + if (a->rd == 13 || a->rd == 15 || a->rn == 13 || a->fcond >= 14) { + /* CONSTRAINED UNPREDICTABLE: we choose to UNDEF */ + return false; + } + + /* In this insn input reg fields of 0b1111 mean "zero", not "PC" */ + if (a->rn == 15) { + rn = tcg_const_i32(0); + } else { + rn = load_reg(s, a->rn); + } + if (a->rm == 15) { + rm = tcg_const_i32(0); + } else { + rm = load_reg(s, a->rm); + } + + switch (a->op) { + case 0: /* CSEL */ + break; + case 1: /* CSINC */ + tcg_gen_addi_i32(rm, rm, 1); + break; + case 2: /* CSINV */ + tcg_gen_not_i32(rm, rm); + break; + case 3: /* CSNEG */ + tcg_gen_neg_i32(rm, rm); + break; + default: + g_assert_not_reached(); + } + + arm_test_cc(&c, a->fcond); + zero = tcg_const_i32(0); + tcg_gen_movcond_i32(c.cond, rn, c.value, zero, rn, rm); + arm_free_cc(&c); + tcg_temp_free_i32(zero); + + store_reg(s, a->rd, rn); + tcg_temp_free_i32(rm); + + return true; +} + /* * Legacy decoder. */ -- cgit v1.2.3-55-g7522