mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2024-12-23 00:05:36 +00:00
hardfloat: implement float32/64 addition and subtraction
Performance results (single and double precision) for fp-bench: 1. Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz - before: add-single: 135.07 MFlops add-double: 131.60 MFlops sub-single: 130.04 MFlops sub-double: 133.01 MFlops - after: add-single: 443.04 MFlops add-double: 301.95 MFlops sub-single: 411.36 MFlops sub-double: 293.15 MFlops 2. ARM Aarch64 A57 @ 2.4GHz - before: add-single: 44.79 MFlops add-double: 49.20 MFlops sub-single: 44.55 MFlops sub-double: 49.06 MFlops - after: add-single: 93.28 MFlops add-double: 88.27 MFlops sub-single: 91.47 MFlops sub-double: 88.27 MFlops 3. IBM POWER8E @ 2.1 GHz - before: add-single: 72.59 MFlops add-double: 72.27 MFlops sub-single: 75.33 MFlops sub-double: 70.54 MFlops - after: add-single: 112.95 MFlops add-double: 201.11 MFlops sub-single: 116.80 MFlops sub-double: 188.72 MFlops Note that the IBM and ARM machines benefit from having HARDFLOAT_2F{32,64}_USE_FP set to 0. Otherwise their performance can suffer significantly: - IBM Power8: add-single: [1] 54.94 vs [0] 116.37 MFlops add-double: [1] 58.92 vs [0] 201.44 MFlops - Aarch64 A57: add-single: [1] 80.72 vs [0] 93.24 MFlops add-double: [1] 82.10 vs [0] 88.18 MFlops On the Intel machine, having 2F64 set to 1 pays off, but it doesn't for 2F32: - Intel i7-6700K: add-single: [1] 285.79 vs [0] 426.70 MFlops add-double: [1] 302.15 vs [0] 278.82 MFlops Backports commit 1b615d482094e0123d187f0ad3c676ba8eb9d0a3 from qemu
This commit is contained in:
parent
bca8e39e3c
commit
0862d9c462
|
@ -1057,28 +1057,7 @@ float16 QEMU_FLATTEN float16_add(float16 a, float16 b,
|
|||
return float16_round_pack_canonical(pr, status);
|
||||
}
|
||||
|
||||
float32 QEMU_FLATTEN float32_add(float32 a, float32 b,
|
||||
float_status *status)
|
||||
{
|
||||
FloatParts pa = float32_unpack_canonical(a, status);
|
||||
FloatParts pb = float32_unpack_canonical(b, status);
|
||||
FloatParts pr = addsub_floats(pa, pb, false, status);
|
||||
|
||||
return float32_round_pack_canonical(pr, status);
|
||||
}
|
||||
|
||||
float64 QEMU_FLATTEN float64_add(float64 a, float64 b,
|
||||
float_status *status)
|
||||
{
|
||||
FloatParts pa = float64_unpack_canonical(a, status);
|
||||
FloatParts pb = float64_unpack_canonical(b, status);
|
||||
FloatParts pr = addsub_floats(pa, pb, false, status);
|
||||
|
||||
return float64_round_pack_canonical(pr, status);
|
||||
}
|
||||
|
||||
float16 QEMU_FLATTEN float16_sub(float16 a, float16 b,
|
||||
float_status *status)
|
||||
float16 QEMU_FLATTEN float16_sub(float16 a, float16 b, float_status *status)
|
||||
{
|
||||
FloatParts pa = float16_unpack_canonical(a, status);
|
||||
FloatParts pb = float16_unpack_canonical(b, status);
|
||||
|
@ -1087,26 +1066,121 @@ float16 QEMU_FLATTEN float16_sub(float16 a, float16 b,
|
|||
return float16_round_pack_canonical(pr, status);
|
||||
}
|
||||
|
||||
float32 QEMU_FLATTEN float32_sub(float32 a, float32 b,
|
||||
float_status *status)
|
||||
static float32 QEMU_SOFTFLOAT_ATTR
|
||||
soft_f32_addsub(float32 a, float32 b, bool subtract, float_status *status)
|
||||
{
|
||||
FloatParts pa = float32_unpack_canonical(a, status);
|
||||
FloatParts pb = float32_unpack_canonical(b, status);
|
||||
FloatParts pr = addsub_floats(pa, pb, true, status);
|
||||
FloatParts pr = addsub_floats(pa, pb, subtract, status);
|
||||
|
||||
return float32_round_pack_canonical(pr, status);
|
||||
}
|
||||
|
||||
float64 QEMU_FLATTEN float64_sub(float64 a, float64 b,
|
||||
float_status *status)
|
||||
static inline float32 soft_f32_add(float32 a, float32 b, float_status *status)
|
||||
{
|
||||
return soft_f32_addsub(a, b, false, status);
|
||||
}
|
||||
|
||||
static inline float32 soft_f32_sub(float32 a, float32 b, float_status *status)
|
||||
{
|
||||
return soft_f32_addsub(a, b, true, status);
|
||||
}
|
||||
|
||||
static float64 QEMU_SOFTFLOAT_ATTR
|
||||
soft_f64_addsub(float64 a, float64 b, bool subtract, float_status *status)
|
||||
{
|
||||
FloatParts pa = float64_unpack_canonical(a, status);
|
||||
FloatParts pb = float64_unpack_canonical(b, status);
|
||||
FloatParts pr = addsub_floats(pa, pb, true, status);
|
||||
FloatParts pr = addsub_floats(pa, pb, subtract, status);
|
||||
|
||||
return float64_round_pack_canonical(pr, status);
|
||||
}
|
||||
|
||||
static inline float64 soft_f64_add(float64 a, float64 b, float_status *status)
|
||||
{
|
||||
return soft_f64_addsub(a, b, false, status);
|
||||
}
|
||||
|
||||
static inline float64 soft_f64_sub(float64 a, float64 b, float_status *status)
|
||||
{
|
||||
return soft_f64_addsub(a, b, true, status);
|
||||
}
|
||||
|
||||
static float hard_f32_add(float a, float b)
|
||||
{
|
||||
return a + b;
|
||||
}
|
||||
|
||||
static float hard_f32_sub(float a, float b)
|
||||
{
|
||||
return a - b;
|
||||
}
|
||||
|
||||
static double hard_f64_add(double a, double b)
|
||||
{
|
||||
return a + b;
|
||||
}
|
||||
|
||||
static double hard_f64_sub(double a, double b)
|
||||
{
|
||||
return a - b;
|
||||
}
|
||||
|
||||
static bool f32_addsub_post(union_float32 a, union_float32 b)
|
||||
{
|
||||
if (QEMU_HARDFLOAT_2F32_USE_FP) {
|
||||
return !(fpclassify(a.h) == FP_ZERO && fpclassify(b.h) == FP_ZERO);
|
||||
}
|
||||
return !(float32_is_zero(a.s) && float32_is_zero(b.s));
|
||||
}
|
||||
|
||||
static bool f64_addsub_post(union_float64 a, union_float64 b)
|
||||
{
|
||||
if (QEMU_HARDFLOAT_2F64_USE_FP) {
|
||||
return !(fpclassify(a.h) == FP_ZERO && fpclassify(b.h) == FP_ZERO);
|
||||
} else {
|
||||
return !(float64_is_zero(a.s) && float64_is_zero(b.s));
|
||||
}
|
||||
}
|
||||
|
||||
static float32 float32_addsub(float32 a, float32 b, float_status *s,
|
||||
hard_f32_op2_fn hard, soft_f32_op2_fn soft)
|
||||
{
|
||||
return float32_gen2(a, b, s, hard, soft,
|
||||
f32_is_zon2, f32_addsub_post, NULL, NULL);
|
||||
}
|
||||
|
||||
static float64 float64_addsub(float64 a, float64 b, float_status *s,
|
||||
hard_f64_op2_fn hard, soft_f64_op2_fn soft)
|
||||
{
|
||||
return float64_gen2(a, b, s, hard, soft,
|
||||
f64_is_zon2, f64_addsub_post, NULL, NULL);
|
||||
}
|
||||
|
||||
float32 QEMU_FLATTEN
|
||||
float32_add(float32 a, float32 b, float_status *s)
|
||||
{
|
||||
return float32_addsub(a, b, s, hard_f32_add, soft_f32_add);
|
||||
}
|
||||
|
||||
float32 QEMU_FLATTEN
|
||||
float32_sub(float32 a, float32 b, float_status *s)
|
||||
{
|
||||
return float32_addsub(a, b, s, hard_f32_sub, soft_f32_sub);
|
||||
}
|
||||
|
||||
float64 QEMU_FLATTEN
|
||||
float64_add(float64 a, float64 b, float_status *s)
|
||||
{
|
||||
return float64_addsub(a, b, s, hard_f64_add, soft_f64_add);
|
||||
}
|
||||
|
||||
float64 QEMU_FLATTEN
|
||||
float64_sub(float64 a, float64 b, float_status *s)
|
||||
{
|
||||
return float64_addsub(a, b, s, hard_f64_sub, soft_f64_sub);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns the result of multiplying the floating-point values `a' and
|
||||
* `b'. The operation is performed according to the IEC/IEEE Standard
|
||||
|
|
Loading…
Reference in a new issue