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target-arm: A64: Implement FCVTL

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Implement FCVTL, the only instruction in the 2-reg-misc group
which widens from size to 2*size elements.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 1394822294-14837-12-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2014-03-17 16:31:49 +00:00
parent 261a5b4dd1
commit 931c8cc270
1 changed files with 47 additions and 0 deletions
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47
target-arm/translate-a64.c
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@ -8489,6 +8489,51 @@ static void handle_2misc_narrow(DisasContext *s, int opcode, bool u, bool is_q,
}
}
static void handle_2misc_widening(DisasContext *s, int opcode, bool is_q,
int size, int rn, int rd)
{
/* Handle 2-reg-misc ops which are widening (so each size element
* in the source becomes a 2*size element in the destination.
* The only instruction like this is FCVTL.
*/
int pass;
if (size == 3) {
/* 32 -> 64 bit fp conversion */
TCGv_i64 tcg_res[2];
int srcelt = is_q ? 2 : 0;
for (pass = 0; pass < 2; pass++) {
TCGv_i32 tcg_op = tcg_temp_new_i32();
tcg_res[pass] = tcg_temp_new_i64();
read_vec_element_i32(s, tcg_op, rn, srcelt + pass, MO_32);
gen_helper_vfp_fcvtds(tcg_res[pass], tcg_op, cpu_env);
tcg_temp_free_i32(tcg_op);
}
for (pass = 0; pass < 2; pass++) {
write_vec_element(s, tcg_res[pass], rd, pass, MO_64);
tcg_temp_free_i64(tcg_res[pass]);
}
} else {
/* 16 -> 32 bit fp conversion */
int srcelt = is_q ? 4 : 0;
TCGv_i32 tcg_res[4];
for (pass = 0; pass < 4; pass++) {
tcg_res[pass] = tcg_temp_new_i32();
read_vec_element_i32(s, tcg_res[pass], rn, srcelt + pass, MO_16);
gen_helper_vfp_fcvt_f16_to_f32(tcg_res[pass], tcg_res[pass],
cpu_env);
}
for (pass = 0; pass < 4; pass++) {
write_vec_element_i32(s, tcg_res[pass], rd, pass, MO_32);
tcg_temp_free_i32(tcg_res[pass]);
}
}
}
static void handle_rev(DisasContext *s, int opcode, bool u,
bool is_q, int size, int rn, int rd)
{
@ -8830,6 +8875,8 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
handle_2misc_narrow(s, opcode, 0, is_q, size - 1, rn, rd);
return;
case 0x17: /* FCVTL, FCVTL2 */
handle_2misc_widening(s, opcode, is_q, size, rn, rd);
return;
case 0x18: /* FRINTN */
case 0x19: /* FRINTM */
case 0x38: /* FRINTP */