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target-arm: Handle UNDEF cases for Neon 2 register misc forms 

Add missing UNDEF checks for Neon "two register miscellaneous" forms:
 * all instructions except VMOVN,VQMOVN must UNDEF
   if Q==1 && (Vd<0> == 1 || Vm<0> == 1)
 * VMOVN,VQMOVN,VCVT.F16.F32 UNDEF if Q == 1 || Vm<0> == 1
 * VSHLL,VCVT.F32.F16 UNDEF if Q == 1 || Vd<0> == 1
(The only other UNDEF case is VZIP,VUZP if Q == 0 && size == 10,
which we already handle.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-04-11 16:26:21 +01:00 committed by Aurelien Jarno
parent 600b828c44
commit fc2a9b3784
1 changed files with 16 additions and 5 deletions
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21
target-arm/translate.c
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@ -5677,6 +5677,10 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
if ((neon_2rm_sizes[op] & (1 << size)) == 0) {
return 1;
}
if ((op != NEON_2RM_VMOVN && op != NEON_2RM_VQMOVN) &&
q && ((rm | rd) & 1)) {
return 1;
}
switch (op) {
case NEON_2RM_VREV64:
for (pass = 0; pass < (q ? 2 : 1); pass++) {
@ -5747,6 +5751,9 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
break;
case NEON_2RM_VMOVN: case NEON_2RM_VQMOVN:
/* also VQMOVUN; op field and mnemonics don't line up */
if (rm & 1) {
return 1;
}
TCGV_UNUSED(tmp2);
for (pass = 0; pass < 2; pass++) {
neon_load_reg64(cpu_V0, rm + pass);
@ -5762,7 +5769,7 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
}
break;
case NEON_2RM_VSHLL:
if (q) {
if (q || (rd & 1)) {
return 1;
}
tmp = neon_load_reg(rm, 0);
@ -5776,8 +5783,10 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
}
break;
case NEON_2RM_VCVT_F16_F32:
if (!arm_feature(env, ARM_FEATURE_VFP_FP16))
return 1;
if (!arm_feature(env, ARM_FEATURE_VFP_FP16) ||
q || (rm & 1)) {
return 1;
}
tmp = tcg_temp_new_i32();
tmp2 = tcg_temp_new_i32();
tcg_gen_ld_f32(cpu_F0s, cpu_env, neon_reg_offset(rm, 0));
@ -5798,8 +5807,10 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
tcg_temp_free_i32(tmp);
break;
case NEON_2RM_VCVT_F32_F16:
if (!arm_feature(env, ARM_FEATURE_VFP_FP16))
return 1;
if (!arm_feature(env, ARM_FEATURE_VFP_FP16) ||
q || (rd & 1)) {
return 1;
}
tmp3 = tcg_temp_new_i32();
tmp = neon_load_reg(rm, 0);
tmp2 = neon_load_reg(rm, 1);