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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 <will.newton@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Will Newton 2014-01-31 14:47:33 +00:00 committed by Peter Maydell
parent 9972da669f
commit 7655f39bde
1 changed files with 54 additions and 0 deletions
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54
target-arm/translate.c
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@ -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;
}