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target-arm: Implement VFPv4 fused multiply-accumulate insns 

Implement the fused multiply-accumulate instructions (VFMA, VFMS,
VFNMA, VFNMS) which are new in VFPv4.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2011-10-19 16:14:07 +00:00
parent 369be8f618
commit da97f52cb3
4 changed files with 90 additions and 0 deletions
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1
target-arm/cpu.h
View File

@ -376,6 +376,7 @@ enum arm_features {
ARM_FEATURE_STRONGARM,
ARM_FEATURE_VAPA, /* cp15 VA to PA lookups */
ARM_FEATURE_ARM_DIV, /* divide supported in ARM encoding */
ARM_FEATURE_VFP4, /* VFPv4 (implies that NEON is v2) */
};
static inline int arm_feature(CPUARMState *env, int feature)

14
target-arm/helper.c
View File

@ -204,6 +204,7 @@ static void cpu_reset_model_id(CPUARMState *env, uint32_t id)
set_feature(env, ARM_FEATURE_THUMB2);
set_feature(env, ARM_FEATURE_VFP);
set_feature(env, ARM_FEATURE_VFP3);
set_feature(env, ARM_FEATURE_VFP4);
set_feature(env, ARM_FEATURE_VFP_FP16);
set_feature(env, ARM_FEATURE_NEON);
set_feature(env, ARM_FEATURE_THUMB2EE);
@ -3084,6 +3085,19 @@ uint32_t HELPER(rsqrte_u32)(uint32_t a, CPUState *env)
return 0x80000000 | ((float64_val(f64) >> 21) & 0x7fffffff);
}
/* VFPv4 fused multiply-accumulate */
float32 VFP_HELPER(muladd, s)(float32 a, float32 b, float32 c, void *fpstp)
{
float_status *fpst = fpstp;
return float32_muladd(a, b, c, 0, fpst);
}
float64 VFP_HELPER(muladd, d)(float64 a, float64 b, float64 c, void *fpstp)
{
float_status *fpst = fpstp;
return float64_muladd(a, b, c, 0, fpst);
}
void HELPER(set_teecr)(CPUState *env, uint32_t val)
{
val &= 1;

3
target-arm/helper.h
View File

@ -132,6 +132,9 @@ 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_4(vfp_muladdd, f64, f64, f64, f64, ptr)
DEF_HELPER_4(vfp_muladds, f32, f32, f32, f32, ptr)
DEF_HELPER_3(recps_f32, f32, f32, f32, env)
DEF_HELPER_3(rsqrts_f32, f32, f32, f32, env)
DEF_HELPER_2(recpe_f32, f32, f32, env)

72
target-arm/translate.c
View File

@ -3141,6 +3141,57 @@ static int disas_vfp_insn(CPUState * env, DisasContext *s, uint32_t insn)
case 8: /* div: fn / fm */
gen_vfp_div(dp);
break;
case 10: /* VFNMA : fd = muladd(-fd, fn, fm) */
case 11: /* VFNMS : fd = muladd(-fd, -fn, fm) */
case 12: /* VFMA : fd = muladd( fd, fn, fm) */
case 13: /* VFMS : fd = muladd( fd, -fn, fm) */
/* These are fused multiply-add, and must be done as one
* floating point operation with no rounding between the
* multiplication and addition steps.
* NB that doing the negations here as separate steps is
* correct : an input NaN should come out with its sign bit
* flipped if it is a negated-input.
*/
if (!arm_feature(env, ARM_FEATURE_VFP4)) {
return 1;
}
if (dp) {
TCGv_ptr fpst;
TCGv_i64 frd;
if (op & 1) {
/* VFNMS, VFMS */
gen_helper_vfp_negd(cpu_F0d, cpu_F0d);
}
frd = tcg_temp_new_i64();
tcg_gen_ld_f64(frd, cpu_env, vfp_reg_offset(dp, rd));
if (op & 2) {
/* VFNMA, VFNMS */
gen_helper_vfp_negd(frd, frd);
}
fpst = get_fpstatus_ptr(0);
gen_helper_vfp_muladdd(cpu_F0d, cpu_F0d,
cpu_F1d, frd, fpst);
tcg_temp_free_ptr(fpst);
tcg_temp_free_i64(frd);
} else {
TCGv_ptr fpst;
TCGv_i32 frd;
if (op & 1) {
/* VFNMS, VFMS */
gen_helper_vfp_negs(cpu_F0s, cpu_F0s);
}
frd = tcg_temp_new_i32();
tcg_gen_ld_f32(frd, cpu_env, vfp_reg_offset(dp, rd));
if (op & 2) {
gen_helper_vfp_negs(frd, frd);
}
fpst = get_fpstatus_ptr(0);
gen_helper_vfp_muladds(cpu_F0s, cpu_F0s,
cpu_F1s, frd, fpst);
tcg_temp_free_ptr(fpst);
tcg_temp_free_i32(frd);
}
break;
case 14: /* fconst */
if (!arm_feature(env, ARM_FEATURE_VFP3))
return 1;
@ -4417,6 +4468,7 @@ static void gen_neon_narrow_op(int op, int u, int size, TCGv dest, TCGv_i64 src)
#define NEON_3R_VPMIN 21
#define NEON_3R_VQDMULH_VQRDMULH 22
#define NEON_3R_VPADD 23
#define NEON_3R_VFM 25 /* VFMA, VFMS : float fused multiply-add */
#define NEON_3R_FLOAT_ARITH 26 /* float VADD, VSUB, VPADD, VABD */
#define NEON_3R_FLOAT_MULTIPLY 27 /* float VMLA, VMLS, VMUL */
#define NEON_3R_FLOAT_CMP 28 /* float VCEQ, VCGE, VCGT */
@ -4449,6 +4501,7 @@ static const uint8_t neon_3r_sizes[] = {
[NEON_3R_VPMIN] = 0x7,
[NEON_3R_VQDMULH_VQRDMULH] = 0x6,
[NEON_3R_VPADD] = 0x7,
[NEON_3R_VFM] = 0x5, /* size bit 1 encodes op */
[NEON_3R_FLOAT_ARITH] = 0x5, /* size bit 1 encodes op */
[NEON_3R_FLOAT_MULTIPLY] = 0x5, /* size bit 1 encodes op */
[NEON_3R_FLOAT_CMP] = 0x5, /* size bit 1 encodes op */
@ -4726,6 +4779,11 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
return 1;
}
break;
case NEON_3R_VFM:
if (!arm_feature(env, ARM_FEATURE_VFP4) || u) {
return 1;
}
break;
default:
break;
}
@ -5006,6 +5064,20 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
else
gen_helper_rsqrts_f32(tmp, tmp, tmp2, cpu_env);
break;
case NEON_3R_VFM:
{
/* VFMA, VFMS: fused multiply-add */
TCGv_ptr fpstatus = get_fpstatus_ptr(1);
TCGv_i32 tmp3 = neon_load_reg(rd, pass);
if (size) {
/* VFMS */
gen_helper_vfp_negs(tmp, tmp);
}
gen_helper_vfp_muladds(tmp, tmp, tmp2, tmp3, fpstatus);
tcg_temp_free_i32(tmp3);
tcg_temp_free_ptr(fpstatus);
break;
}
default:
abort();
}