From: Will Newton <will.new...@linaro.org>
Add support for AArch32 ARMv8 FP VRINTA, VRINTN, VRINTP and VRINTM
instructions.
Signed-off-by: Will Newton <will.new...@linaro.org>
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
target-arm/translate.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
diff --git a/target-arm/translate.c b/target-arm/translate.c
index 8d240e1..2db6812 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;
}
--
1.8.5
