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author | Peter Maydell <peter.maydell@linaro.org> | 2011-10-19 16:14:07 +0000 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2011-10-19 16:14:07 +0000 |
commit | da97f52cb35ccf72a4a3d745926ee5e3c263ed07 (patch) | |
tree | 4a83c955b33a27bc620502e3470e7fbf8ebe44dc /target-arm | |
parent | 369be8f618ac145d2421ea4bfff86ee774ad618c (diff) | |
download | qemu-da97f52cb35ccf72a4a3d745926ee5e3c263ed07.zip qemu-da97f52cb35ccf72a4a3d745926ee5e3c263ed07.tar.gz qemu-da97f52cb35ccf72a4a3d745926ee5e3c263ed07.tar.bz2 |
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>
Diffstat (limited to 'target-arm')
-rw-r--r-- | target-arm/cpu.h | 1 | ||||
-rw-r--r-- | target-arm/helper.c | 14 | ||||
-rw-r--r-- | target-arm/helper.h | 3 | ||||
-rw-r--r-- | target-arm/translate.c | 72 |
4 files changed, 90 insertions, 0 deletions
diff --git a/target-arm/cpu.h b/target-arm/cpu.h index af3904d..c4d742f 100644 --- a/target-arm/cpu.h +++ b/target-arm/cpu.h @@ -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) diff --git a/target-arm/helper.c b/target-arm/helper.c index 3a51fd7..eddb923 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -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; diff --git a/target-arm/helper.h b/target-arm/helper.h index 3ad1cb0..16dd5fc 100644 --- a/target-arm/helper.h +++ b/target-arm/helper.h @@ -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) diff --git a/target-arm/translate.c b/target-arm/translate.c index 812a9e7..0f35b60 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -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(); } |