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target/riscv: zfh: half-precision computational 

Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>
Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20211210074329.5775-3-frank.chang@sifive.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Kito Cheng 2021-12-10 15:43:21 +08:00 committed by Alistair Francis
parent 915f77b211
commit 00c1899f12
5 changed files with 255 additions and 0 deletions
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86
target/riscv/fpu_helper.c
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@ -81,6 +81,15 @@ void helper_set_rounding_mode(CPURISCVState *env, uint32_t rm)
set_float_rounding_mode(softrm, &env->fp_status);
}
static uint64_t do_fmadd_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2,
uint64_t rs3, int flags)
{
float16 frs1 = check_nanbox_h(rs1);
float16 frs2 = check_nanbox_h(rs2);
float16 frs3 = check_nanbox_h(rs3);
return nanbox_h(float16_muladd(frs1, frs2, frs3, flags, &env->fp_status));
}
static uint64_t do_fmadd_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2,
uint64_t rs3, int flags)
{
@ -102,6 +111,12 @@ uint64_t helper_fmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
return float64_muladd(frs1, frs2, frs3, 0, &env->fp_status);
}
uint64_t helper_fmadd_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return do_fmadd_h(env, frs1, frs2, frs3, 0);
}
uint64_t helper_fmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
@ -115,6 +130,12 @@ uint64_t helper_fmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
&env->fp_status);
}
uint64_t helper_fmsub_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return do_fmadd_h(env, frs1, frs2, frs3, float_muladd_negate_c);
}
uint64_t helper_fnmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
@ -128,6 +149,12 @@ uint64_t helper_fnmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
&env->fp_status);
}
uint64_t helper_fnmsub_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return do_fmadd_h(env, frs1, frs2, frs3, float_muladd_negate_product);
}
uint64_t helper_fnmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
@ -142,6 +169,13 @@ uint64_t helper_fnmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
float_muladd_negate_product, &env->fp_status);
}
uint64_t helper_fnmadd_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return do_fmadd_h(env, frs1, frs2, frs3,
float_muladd_negate_c | float_muladd_negate_product);
}
uint64_t helper_fadd_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
{
float32 frs1 = check_nanbox_s(rs1);
@ -374,3 +408,55 @@ target_ulong helper_fclass_d(uint64_t frs1)
{
return fclass_d(frs1);
}
uint64_t helper_fadd_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
{
float16 frs1 = check_nanbox_h(rs1);
float16 frs2 = check_nanbox_h(rs2);
return nanbox_h(float16_add(frs1, frs2, &env->fp_status));
}
uint64_t helper_fsub_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
{
float16 frs1 = check_nanbox_h(rs1);
float16 frs2 = check_nanbox_h(rs2);
return nanbox_h(float16_sub(frs1, frs2, &env->fp_status));
}
uint64_t helper_fmul_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
{
float16 frs1 = check_nanbox_h(rs1);
float16 frs2 = check_nanbox_h(rs2);
return nanbox_h(float16_mul(frs1, frs2, &env->fp_status));
}
uint64_t helper_fdiv_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
{
float16 frs1 = check_nanbox_h(rs1);
float16 frs2 = check_nanbox_h(rs2);
return nanbox_h(float16_div(frs1, frs2, &env->fp_status));
}
uint64_t helper_fmin_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
{
float16 frs1 = check_nanbox_h(rs1);
float16 frs2 = check_nanbox_h(rs2);
return nanbox_h(env->priv_ver < PRIV_VERSION_1_11_0 ?
float16_minnum(frs1, frs2, &env->fp_status) :
float16_minimum_number(frs1, frs2, &env->fp_status));
}
uint64_t helper_fmax_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
{
float16 frs1 = check_nanbox_h(rs1);
float16 frs2 = check_nanbox_h(rs2);
return nanbox_h(env->priv_ver < PRIV_VERSION_1_11_0 ?
float16_maxnum(frs1, frs2, &env->fp_status) :
float16_maximum_number(frs1, frs2, &env->fp_status));
}
uint64_t helper_fsqrt_h(CPURISCVState *env, uint64_t rs1)
{
float16 frs1 = check_nanbox_h(rs1);
return nanbox_h(float16_sqrt(frs1, &env->fp_status));
}

13
target/riscv/helper.h
View File

@ -7,12 +7,16 @@ DEF_HELPER_FLAGS_2(set_rounding_mode, TCG_CALL_NO_WG, void, env, i32)
/* Floating Point - fused */
DEF_HELPER_FLAGS_4(fmadd_s, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fmadd_d, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fmadd_h, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fmsub_s, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fmsub_d, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fmsub_h, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fnmsub_s, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fnmsub_d, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fnmsub_h, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fnmadd_s, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fnmadd_d, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(fnmadd_h, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
/* Floating Point - Single Precision */
DEF_HELPER_FLAGS_3(fadd_s, TCG_CALL_NO_RWG, i64, env, i64, i64)
@ -62,6 +66,15 @@ DEF_HELPER_FLAGS_1(fclass_d, TCG_CALL_NO_RWG_SE, tl, i64)
DEF_HELPER_FLAGS_2(clmul, TCG_CALL_NO_RWG_SE, tl, tl, tl)
DEF_HELPER_FLAGS_2(clmulr, TCG_CALL_NO_RWG_SE, tl, tl, tl)
/* Floating Point - Half Precision */
DEF_HELPER_FLAGS_3(fadd_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
DEF_HELPER_FLAGS_3(fsub_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
DEF_HELPER_FLAGS_3(fmul_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
DEF_HELPER_FLAGS_3(fdiv_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
DEF_HELPER_FLAGS_3(fmin_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
DEF_HELPER_FLAGS_3(fmax_h, TCG_CALL_NO_RWG, i64, env, i64, i64)
DEF_HELPER_FLAGS_2(fsqrt_h, TCG_CALL_NO_RWG, i64, env, i64)
/* Special functions */
DEF_HELPER_2(csrr, tl, env, int)
DEF_HELPER_3(csrw, void, env, int, tl)

11
target/riscv/insn32.decode
View File

@ -730,3 +730,14 @@ bseti 00101. ........... 001 ..... 0010011 @sh
# *** RV32 Zfh Extension ***
flh ............ ..... 001 ..... 0000111 @i
fsh ....... ..... ..... 001 ..... 0100111 @s
fmadd_h ..... 10 ..... ..... ... ..... 1000011 @r4_rm
fmsub_h ..... 10 ..... ..... ... ..... 1000111 @r4_rm
fnmsub_h ..... 10 ..... ..... ... ..... 1001011 @r4_rm
fnmadd_h ..... 10 ..... ..... ... ..... 1001111 @r4_rm
fadd_h 0000010 ..... ..... ... ..... 1010011 @r_rm
fsub_h 0000110 ..... ..... ... ..... 1010011 @r_rm
fmul_h 0001010 ..... ..... ... ..... 1010011 @r_rm
fdiv_h 0001110 ..... ..... ... ..... 1010011 @r_rm
fsqrt_h 0101110 00000 ..... ... ..... 1010011 @r2_rm
fmin_h 0010110 ..... ..... 000 ..... 1010011 @r
fmax_h 0010110 ..... ..... 001 ..... 1010011 @r

129
target/riscv/insn_trans/trans_rvzfh.c.inc
View File

@ -63,3 +63,132 @@ static bool trans_fsh(DisasContext *ctx, arg_fsh *a)
return true;
}
static bool trans_fmadd_h(DisasContext *ctx, arg_fmadd_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fmadd_h(cpu_fpr[a->rd], cpu_env, cpu_fpr[a->rs1],
cpu_fpr[a->rs2], cpu_fpr[a->rs3]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fmsub_h(DisasContext *ctx, arg_fmsub_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fmsub_h(cpu_fpr[a->rd], cpu_env, cpu_fpr[a->rs1],
cpu_fpr[a->rs2], cpu_fpr[a->rs3]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fnmsub_h(DisasContext *ctx, arg_fnmsub_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fnmsub_h(cpu_fpr[a->rd], cpu_env, cpu_fpr[a->rs1],
cpu_fpr[a->rs2], cpu_fpr[a->rs3]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fnmadd_h(DisasContext *ctx, arg_fnmadd_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fnmadd_h(cpu_fpr[a->rd], cpu_env, cpu_fpr[a->rs1],
cpu_fpr[a->rs2], cpu_fpr[a->rs3]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fadd_h(DisasContext *ctx, arg_fadd_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fadd_h(cpu_fpr[a->rd], cpu_env,
cpu_fpr[a->rs1], cpu_fpr[a->rs2]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fsub_h(DisasContext *ctx, arg_fsub_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fsub_h(cpu_fpr[a->rd], cpu_env,
cpu_fpr[a->rs1], cpu_fpr[a->rs2]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fmul_h(DisasContext *ctx, arg_fmul_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fmul_h(cpu_fpr[a->rd], cpu_env,
cpu_fpr[a->rs1], cpu_fpr[a->rs2]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fdiv_h(DisasContext *ctx, arg_fdiv_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fdiv_h(cpu_fpr[a->rd], cpu_env,
cpu_fpr[a->rs1], cpu_fpr[a->rs2]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fsqrt_h(DisasContext *ctx, arg_fsqrt_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_set_rm(ctx, a->rm);
gen_helper_fsqrt_h(cpu_fpr[a->rd], cpu_env, cpu_fpr[a->rs1]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fmin_h(DisasContext *ctx, arg_fmin_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_helper_fmin_h(cpu_fpr[a->rd], cpu_env, cpu_fpr[a->rs1],
cpu_fpr[a->rs2]);
mark_fs_dirty(ctx);
return true;
}
static bool trans_fmax_h(DisasContext *ctx, arg_fmax_h *a)
{
REQUIRE_FPU;
REQUIRE_ZFH(ctx);
gen_helper_fmax_h(cpu_fpr[a->rd], cpu_env, cpu_fpr[a->rs1],
cpu_fpr[a->rs2]);
mark_fs_dirty(ctx);
return true;
}

16
target/riscv/internals.h
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@ -58,4 +58,20 @@ static inline float32 check_nanbox_s(uint64_t f)
}
}
static inline uint64_t nanbox_h(float16 f)
{
return f | MAKE_64BIT_MASK(16, 48);
}
static inline float16 check_nanbox_h(uint64_t f)
{
uint64_t mask = MAKE_64BIT_MASK(16, 48);
if (likely((f & mask) == mask)) {
return (uint16_t)f;
} else {
return 0x7E00u; /* default qnan */
}
}
#endif