From 7655f39bde5de92b4a3c154a5a8735476c34f458 Mon Sep 17 00:00:00 2001 From: Will Newton Date: Fri, 31 Jan 2014 14:47:33 +0000 Subject: [PATCH] target-arm: Add AArch32 FP VRINTA, VRINTN, VRINTP and VRINTM Add support for AArch32 ARMv8 FP VRINTA, VRINTN, VRINTP and VRINTM instructions. Signed-off-by: Will Newton Signed-off-by: Peter Maydell --- target-arm/translate.c | 54 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/target-arm/translate.c b/target-arm/translate.c index 8d240e160d..2db681287d 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -2759,6 +2759,56 @@ static int handle_vminmaxnm(uint32_t insn, uint32_t rd, uint32_t rn, return 0; } +static int handle_vrint(uint32_t insn, uint32_t rd, uint32_t rm, uint32_t dp, + int rounding) +{ + TCGv_ptr fpst = get_fpstatus_ptr(0); + TCGv_i32 tcg_rmode; + + tcg_rmode = tcg_const_i32(arm_rmode_to_sf(rounding)); + gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env); + + if (dp) { + TCGv_i64 tcg_op; + TCGv_i64 tcg_res; + tcg_op = tcg_temp_new_i64(); + tcg_res = tcg_temp_new_i64(); + tcg_gen_ld_f64(tcg_op, cpu_env, vfp_reg_offset(dp, rm)); + gen_helper_rintd(tcg_res, tcg_op, fpst); + tcg_gen_st_f64(tcg_res, cpu_env, vfp_reg_offset(dp, rd)); + tcg_temp_free_i64(tcg_op); + tcg_temp_free_i64(tcg_res); + } else { + TCGv_i32 tcg_op; + TCGv_i32 tcg_res; + tcg_op = tcg_temp_new_i32(); + tcg_res = tcg_temp_new_i32(); + tcg_gen_ld_f32(tcg_op, cpu_env, vfp_reg_offset(dp, rm)); + gen_helper_rints(tcg_res, tcg_op, fpst); + tcg_gen_st_f32(tcg_res, cpu_env, vfp_reg_offset(dp, rd)); + tcg_temp_free_i32(tcg_op); + tcg_temp_free_i32(tcg_res); + } + + gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env); + tcg_temp_free_i32(tcg_rmode); + + tcg_temp_free_ptr(fpst); + return 0; +} + + +/* Table for converting the most common AArch32 encoding of + * rounding mode to arm_fprounding order (which matches the + * common AArch64 order); see ARM ARM pseudocode FPDecodeRM(). + */ +static const uint8_t fp_decode_rm[] = { + FPROUNDING_TIEAWAY, + FPROUNDING_TIEEVEN, + FPROUNDING_POSINF, + FPROUNDING_NEGINF, +}; + static int disas_vfp_v8_insn(CPUARMState *env, DisasContext *s, uint32_t insn) { uint32_t rd, rn, rm, dp = extract32(insn, 8, 1); @@ -2781,6 +2831,10 @@ static int disas_vfp_v8_insn(CPUARMState *env, DisasContext *s, uint32_t insn) return handle_vsel(insn, rd, rn, rm, dp); } else if ((insn & 0x0fb00e10) == 0x0e800a00) { return handle_vminmaxnm(insn, rd, rn, rm, dp); + } else if ((insn & 0x0fbc0ed0) == 0x0eb80a40) { + /* VRINTA, VRINTN, VRINTP, VRINTM */ + int rounding = fp_decode_rm[extract32(insn, 16, 2)]; + return handle_vrint(insn, rd, rm, dp, rounding); } return 1; }