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target/arm: convert conversion helpers to fpst/ahp_flag

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Instead of passing env and leaving it up to the helper to get the
right fpstatus we pass it explicitly. There was already a get_fpstatus
helper for neon for the 32 bit code. We also add an get_ahp_flag() for
passing the state of the alternative FP16 format flag. This leaves
scope for later tracking the AHP state in translation flags.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2018-05-07 13:17:16 +01:00 committed by Richard Henderson
parent 0bcfbcbea5
commit 486624fcd3
5 changed files with 112 additions and 77 deletions
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56
target/arm/helper.c
View File

@ -11540,64 +11540,24 @@ uint32_t HELPER(set_neon_rmode)(uint32_t rmode, CPUARMState *env)
}
/* Half precision conversions. */
static float32 do_fcvt_f16_to_f32(uint32_t a, CPUARMState *env, float_status *s)
float32 HELPER(vfp_fcvt_f16_to_f32)(float16 a, void *fpstp, uint32_t ahp_mode)
{
int ieee = (env->vfp.xregs[ARM_VFP_FPSCR] & (1 << 26)) == 0;
float32 r = float16_to_float32(make_float16(a), ieee, s);
if (ieee) {
return float32_maybe_silence_nan(r, s);
}
return r;
return float16_to_float32(a, !ahp_mode, fpstp);
}
static uint32_t do_fcvt_f32_to_f16(float32 a, CPUARMState *env, float_status *s)
float16 HELPER(vfp_fcvt_f32_to_f16)(float32 a, void *fpstp, uint32_t ahp_mode)
{
int ieee = (env->vfp.xregs[ARM_VFP_FPSCR] & (1 << 26)) == 0;
float16 r = float32_to_float16(a, ieee, s);
if (ieee) {
r = float16_maybe_silence_nan(r, s);
}
return float16_val(r);
return float32_to_float16(a, !ahp_mode, fpstp);
}
float32 HELPER(neon_fcvt_f16_to_f32)(uint32_t a, CPUARMState *env)
float64 HELPER(vfp_fcvt_f16_to_f64)(float16 a, void *fpstp, uint32_t ahp_mode)
{
return do_fcvt_f16_to_f32(a, env, &env->vfp.standard_fp_status);
return float16_to_float64(a, !ahp_mode, fpstp);
}
uint32_t HELPER(neon_fcvt_f32_to_f16)(float32 a, CPUARMState *env)
float16 HELPER(vfp_fcvt_f64_to_f16)(float64 a, void *fpstp, uint32_t ahp_mode)
{
return do_fcvt_f32_to_f16(a, env, &env->vfp.standard_fp_status);
}
float32 HELPER(vfp_fcvt_f16_to_f32)(uint32_t a, CPUARMState *env)
{
return do_fcvt_f16_to_f32(a, env, &env->vfp.fp_status);
}
uint32_t HELPER(vfp_fcvt_f32_to_f16)(float32 a, CPUARMState *env)
{
return do_fcvt_f32_to_f16(a, env, &env->vfp.fp_status);
}
float64 HELPER(vfp_fcvt_f16_to_f64)(uint32_t a, CPUARMState *env)
{
int ieee = (env->vfp.xregs[ARM_VFP_FPSCR] & (1 << 26)) == 0;
float64 r = float16_to_float64(make_float16(a), ieee, &env->vfp.fp_status);
if (ieee) {
return float64_maybe_silence_nan(r, &env->vfp.fp_status);
}
return r;
}
uint32_t HELPER(vfp_fcvt_f64_to_f16)(float64 a, CPUARMState *env)
{
int ieee = (env->vfp.xregs[ARM_VFP_FPSCR] & (1 << 26)) == 0;
float16 r = float64_to_float16(a, ieee, &env->vfp.fp_status);
if (ieee) {
r = float16_maybe_silence_nan(r, &env->vfp.fp_status);
}
return float16_val(r);
return float64_to_float16(a, !ahp_mode, fpstp);
}
#define float32_two make_float32(0x40000000)

10
target/arm/helper.h
View File

@ -187,12 +187,10 @@ DEF_HELPER_3(vfp_uqtoh, f16, i64, i32, ptr)
DEF_HELPER_FLAGS_2(set_rmode, TCG_CALL_NO_RWG, i32, i32, ptr)
DEF_HELPER_FLAGS_2(set_neon_rmode, TCG_CALL_NO_RWG, i32, i32, env)
DEF_HELPER_2(vfp_fcvt_f16_to_f32, f32, i32, env)
DEF_HELPER_2(vfp_fcvt_f32_to_f16, i32, f32, env)
DEF_HELPER_2(neon_fcvt_f16_to_f32, f32, i32, env)
DEF_HELPER_2(neon_fcvt_f32_to_f16, i32, f32, env)
DEF_HELPER_FLAGS_2(vfp_fcvt_f16_to_f64, TCG_CALL_NO_RWG, f64, i32, env)
DEF_HELPER_FLAGS_2(vfp_fcvt_f64_to_f16, TCG_CALL_NO_RWG, i32, f64, env)
DEF_HELPER_FLAGS_3(vfp_fcvt_f16_to_f32, TCG_CALL_NO_RWG, f32, f16, ptr, i32)
DEF_HELPER_FLAGS_3(vfp_fcvt_f32_to_f16, TCG_CALL_NO_RWG, f16, f32, ptr, i32)
DEF_HELPER_FLAGS_3(vfp_fcvt_f16_to_f64, TCG_CALL_NO_RWG, f64, f16, ptr, i32)
DEF_HELPER_FLAGS_3(vfp_fcvt_f64_to_f16, TCG_CALL_NO_RWG, f16, f64, ptr, i32)
DEF_HELPER_4(vfp_muladdd, f64, f64, f64, f64, ptr)
DEF_HELPER_4(vfp_muladds, f32, f32, f32, f32, ptr)

37
target/arm/translate-a64.c
View File

@ -5147,10 +5147,15 @@ static void handle_fp_fcvt(DisasContext *s, int opcode,
} else {
/* Single to half */
TCGv_i32 tcg_rd = tcg_temp_new_i32();
gen_helper_vfp_fcvt_f32_to_f16(tcg_rd, tcg_rn, cpu_env);
TCGv_i32 ahp = get_ahp_flag();
TCGv_ptr fpst = get_fpstatus_ptr(false);
gen_helper_vfp_fcvt_f32_to_f16(tcg_rd, tcg_rn, fpst, ahp);
/* write_fp_sreg is OK here because top half of tcg_rd is zero */
write_fp_sreg(s, rd, tcg_rd);
tcg_temp_free_i32(tcg_rd);
tcg_temp_free_i32(ahp);
tcg_temp_free_ptr(fpst);
}
tcg_temp_free_i32(tcg_rn);
break;
@ -5163,9 +5168,13 @@ static void handle_fp_fcvt(DisasContext *s, int opcode,
/* Double to single */
gen_helper_vfp_fcvtsd(tcg_rd, tcg_rn, cpu_env);
} else {
TCGv_ptr fpst = get_fpstatus_ptr(false);
TCGv_i32 ahp = get_ahp_flag();
/* Double to half */
gen_helper_vfp_fcvt_f64_to_f16(tcg_rd, tcg_rn, cpu_env);
gen_helper_vfp_fcvt_f64_to_f16(tcg_rd, tcg_rn, fpst, ahp);
/* write_fp_sreg is OK here because top half of tcg_rd is zero */
tcg_temp_free_ptr(fpst);
tcg_temp_free_i32(ahp);
}
write_fp_sreg(s, rd, tcg_rd);
tcg_temp_free_i32(tcg_rd);
@ -5175,17 +5184,21 @@ static void handle_fp_fcvt(DisasContext *s, int opcode,
case 0x3:
{
TCGv_i32 tcg_rn = read_fp_sreg(s, rn);
TCGv_ptr tcg_fpst = get_fpstatus_ptr(false);
TCGv_i32 tcg_ahp = get_ahp_flag();
tcg_gen_ext16u_i32(tcg_rn, tcg_rn);
if (dtype == 0) {
/* Half to single */
TCGv_i32 tcg_rd = tcg_temp_new_i32();
gen_helper_vfp_fcvt_f16_to_f32(tcg_rd, tcg_rn, cpu_env);
gen_helper_vfp_fcvt_f16_to_f32(tcg_rd, tcg_rn, tcg_fpst, tcg_ahp);
write_fp_sreg(s, rd, tcg_rd);
tcg_temp_free_ptr(tcg_fpst);
tcg_temp_free_i32(tcg_ahp);
tcg_temp_free_i32(tcg_rd);
} else {
/* Half to double */
TCGv_i64 tcg_rd = tcg_temp_new_i64();
gen_helper_vfp_fcvt_f16_to_f64(tcg_rd, tcg_rn, cpu_env);
gen_helper_vfp_fcvt_f16_to_f64(tcg_rd, tcg_rn, tcg_fpst, tcg_ahp);
write_fp_dreg(s, rd, tcg_rd);
tcg_temp_free_i64(tcg_rd);
}
@ -9053,12 +9066,17 @@ static void handle_2misc_narrow(DisasContext *s, bool scalar,
} else {
TCGv_i32 tcg_lo = tcg_temp_new_i32();
TCGv_i32 tcg_hi = tcg_temp_new_i32();
TCGv_ptr fpst = get_fpstatus_ptr(false);
TCGv_i32 ahp = get_ahp_flag();
tcg_gen_extr_i64_i32(tcg_lo, tcg_hi, tcg_op);
gen_helper_vfp_fcvt_f32_to_f16(tcg_lo, tcg_lo, cpu_env);
gen_helper_vfp_fcvt_f32_to_f16(tcg_hi, tcg_hi, cpu_env);
gen_helper_vfp_fcvt_f32_to_f16(tcg_lo, tcg_lo, fpst, ahp);
gen_helper_vfp_fcvt_f32_to_f16(tcg_hi, tcg_hi, fpst, ahp);
tcg_gen_deposit_i32(tcg_res[pass], tcg_lo, tcg_hi, 16, 16);
tcg_temp_free_i32(tcg_lo);
tcg_temp_free_i32(tcg_hi);
tcg_temp_free_ptr(fpst);
tcg_temp_free_i32(ahp);
}
break;
case 0x56: /* FCVTXN, FCVTXN2 */
@ -11532,18 +11550,23 @@ static void handle_2misc_widening(DisasContext *s, int opcode, bool is_q,
/* 16 -> 32 bit fp conversion */
int srcelt = is_q ? 4 : 0;
TCGv_i32 tcg_res[4];
TCGv_ptr fpst = get_fpstatus_ptr(false);
TCGv_i32 ahp = get_ahp_flag();
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);
fpst, ahp);
}
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]);
}
tcg_temp_free_ptr(fpst);
tcg_temp_free_i32(ahp);
}
}

74
target/arm/translate.c
View File

@ -3824,38 +3824,56 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
gen_vfp_sqrt(dp);
break;
case 4: /* vcvtb.f32.f16, vcvtb.f64.f16 */
{
TCGv_ptr fpst = get_fpstatus_ptr(false);
TCGv_i32 ahp_mode = get_ahp_flag();
tmp = gen_vfp_mrs();
tcg_gen_ext16u_i32(tmp, tmp);
if (dp) {
gen_helper_vfp_fcvt_f16_to_f64(cpu_F0d, tmp,
cpu_env);
fpst, ahp_mode);
} else {
gen_helper_vfp_fcvt_f16_to_f32(cpu_F0s, tmp,
cpu_env);
fpst, ahp_mode);
}
tcg_temp_free_i32(ahp_mode);
tcg_temp_free_ptr(fpst);
tcg_temp_free_i32(tmp);
break;
}
case 5: /* vcvtt.f32.f16, vcvtt.f64.f16 */
{
TCGv_ptr fpst = get_fpstatus_ptr(false);
TCGv_i32 ahp = get_ahp_flag();
tmp = gen_vfp_mrs();
tcg_gen_shri_i32(tmp, tmp, 16);
if (dp) {
gen_helper_vfp_fcvt_f16_to_f64(cpu_F0d, tmp,
cpu_env);
fpst, ahp);
} else {
gen_helper_vfp_fcvt_f16_to_f32(cpu_F0s, tmp,
cpu_env);
fpst, ahp);
}
tcg_temp_free_i32(tmp);
tcg_temp_free_i32(ahp);
tcg_temp_free_ptr(fpst);
break;
}
case 6: /* vcvtb.f16.f32, vcvtb.f16.f64 */
{
TCGv_ptr fpst = get_fpstatus_ptr(false);
TCGv_i32 ahp = get_ahp_flag();
tmp = tcg_temp_new_i32();
if (dp) {
gen_helper_vfp_fcvt_f64_to_f16(tmp, cpu_F0d,
cpu_env);
fpst, ahp);
} else {
gen_helper_vfp_fcvt_f32_to_f16(tmp, cpu_F0s,
cpu_env);
fpst, ahp);
}
tcg_temp_free_i32(ahp);
tcg_temp_free_ptr(fpst);
gen_mov_F0_vreg(0, rd);
tmp2 = gen_vfp_mrs();
tcg_gen_andi_i32(tmp2, tmp2, 0xffff0000);
@ -3863,15 +3881,21 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
tcg_temp_free_i32(tmp2);
gen_vfp_msr(tmp);
break;
}
case 7: /* vcvtt.f16.f32, vcvtt.f16.f64 */
{
TCGv_ptr fpst = get_fpstatus_ptr(false);
TCGv_i32 ahp = get_ahp_flag();
tmp = tcg_temp_new_i32();
if (dp) {
gen_helper_vfp_fcvt_f64_to_f16(tmp, cpu_F0d,
cpu_env);
fpst, ahp);
} else {
gen_helper_vfp_fcvt_f32_to_f16(tmp, cpu_F0s,
cpu_env);
fpst, ahp);
}
tcg_temp_free_i32(ahp);
tcg_temp_free_ptr(fpst);
tcg_gen_shli_i32(tmp, tmp, 16);
gen_mov_F0_vreg(0, rd);
tmp2 = gen_vfp_mrs();
@ -3880,6 +3904,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
tcg_temp_free_i32(tmp2);
gen_vfp_msr(tmp);
break;
}
case 8: /* cmp */
gen_vfp_cmp(dp);
break;
@ -7222,53 +7247,70 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
}
break;
case NEON_2RM_VCVT_F16_F32:
{
TCGv_ptr fpst;
TCGv_i32 ahp;
if (!arm_dc_feature(s, ARM_FEATURE_VFP_FP16) ||
q || (rm & 1)) {
return 1;
}
tmp = tcg_temp_new_i32();
tmp2 = tcg_temp_new_i32();
fpst = get_fpstatus_ptr(true);
ahp = get_ahp_flag();
tcg_gen_ld_f32(cpu_F0s, cpu_env, neon_reg_offset(rm, 0));
gen_helper_neon_fcvt_f32_to_f16(tmp, cpu_F0s, cpu_env);
gen_helper_vfp_fcvt_f32_to_f16(tmp, cpu_F0s, fpst, ahp);
tcg_gen_ld_f32(cpu_F0s, cpu_env, neon_reg_offset(rm, 1));
gen_helper_neon_fcvt_f32_to_f16(tmp2, cpu_F0s, cpu_env);
gen_helper_vfp_fcvt_f32_to_f16(tmp2, cpu_F0s, fpst, ahp);
tcg_gen_shli_i32(tmp2, tmp2, 16);
tcg_gen_or_i32(tmp2, tmp2, tmp);
tcg_gen_ld_f32(cpu_F0s, cpu_env, neon_reg_offset(rm, 2));
gen_helper_neon_fcvt_f32_to_f16(tmp, cpu_F0s, cpu_env);
gen_helper_vfp_fcvt_f32_to_f16(tmp, cpu_F0s, fpst, ahp);
tcg_gen_ld_f32(cpu_F0s, cpu_env, neon_reg_offset(rm, 3));
neon_store_reg(rd, 0, tmp2);
tmp2 = tcg_temp_new_i32();
gen_helper_neon_fcvt_f32_to_f16(tmp2, cpu_F0s, cpu_env);
gen_helper_vfp_fcvt_f32_to_f16(tmp2, cpu_F0s, fpst, ahp);
tcg_gen_shli_i32(tmp2, tmp2, 16);
tcg_gen_or_i32(tmp2, tmp2, tmp);
neon_store_reg(rd, 1, tmp2);
tcg_temp_free_i32(tmp);
tcg_temp_free_i32(ahp);
tcg_temp_free_ptr(fpst);
break;
}
case NEON_2RM_VCVT_F32_F16:
{
TCGv_ptr fpst;
TCGv_i32 ahp;
if (!arm_dc_feature(s, ARM_FEATURE_VFP_FP16) ||
q || (rd & 1)) {
return 1;
}
fpst = get_fpstatus_ptr(true);
ahp = get_ahp_flag();
tmp3 = tcg_temp_new_i32();
tmp = neon_load_reg(rm, 0);
tmp2 = neon_load_reg(rm, 1);
tcg_gen_ext16u_i32(tmp3, tmp);
gen_helper_neon_fcvt_f16_to_f32(cpu_F0s, tmp3, cpu_env);
gen_helper_vfp_fcvt_f16_to_f32(cpu_F0s, tmp3, fpst, ahp);
tcg_gen_st_f32(cpu_F0s, cpu_env, neon_reg_offset(rd, 0));
tcg_gen_shri_i32(tmp3, tmp, 16);
gen_helper_neon_fcvt_f16_to_f32(cpu_F0s, tmp3, cpu_env);
gen_helper_vfp_fcvt_f16_to_f32(cpu_F0s, tmp3, fpst, ahp);
tcg_gen_st_f32(cpu_F0s, cpu_env, neon_reg_offset(rd, 1));
tcg_temp_free_i32(tmp);
tcg_gen_ext16u_i32(tmp3, tmp2);
gen_helper_neon_fcvt_f16_to_f32(cpu_F0s, tmp3, cpu_env);
gen_helper_vfp_fcvt_f16_to_f32(cpu_F0s, tmp3, fpst, ahp);
tcg_gen_st_f32(cpu_F0s, cpu_env, neon_reg_offset(rd, 2));
tcg_gen_shri_i32(tmp3, tmp2, 16);
gen_helper_neon_fcvt_f16_to_f32(cpu_F0s, tmp3, cpu_env);
gen_helper_vfp_fcvt_f16_to_f32(cpu_F0s, tmp3, fpst, ahp);
tcg_gen_st_f32(cpu_F0s, cpu_env, neon_reg_offset(rd, 3));
tcg_temp_free_i32(tmp2);
tcg_temp_free_i32(tmp3);
tcg_temp_free_i32(ahp);
tcg_temp_free_ptr(fpst);
break;
}
case NEON_2RM_AESE: case NEON_2RM_AESMC:
if (!arm_dc_feature(s, ARM_FEATURE_V8_AES)
|| ((rm | rd) & 1)) {

12
target/arm/translate.h
View File

@ -177,4 +177,16 @@ void arm_free_cc(DisasCompare *cmp);
void arm_jump_cc(DisasCompare *cmp, TCGLabel *label);
void arm_gen_test_cc(int cc, TCGLabel *label);
/* Return state of Alternate Half-precision flag, caller frees result */
static inline TCGv_i32 get_ahp_flag(void)
{
TCGv_i32 ret = tcg_temp_new_i32();
tcg_gen_ld_i32(ret, cpu_env,
offsetof(CPUARMState, vfp.xregs[ARM_VFP_FPSCR]));
tcg_gen_extract_i32(ret, ret, 26, 1);
return ret;
}
#endif /* TARGET_ARM_TRANSLATE_H */