diff options
author | Emilio G. Cota <cota@braap.org> | 2018-03-17 00:45:01 -0400 |
---|---|---|
committer | Alex Bennée <alex.bennee@linaro.org> | 2018-12-17 08:25:25 +0000 |
commit | 4a6295613f533a6841de5968c50e1ca36748807e (patch) | |
tree | f2ba39d2a76e5a48dc3eeca9387b0642e753b3c6 | |
parent | 2dfabc86e656e835c67954c60e143ecd33e15817 (diff) |
hardfloat: implement float32/64 division
Performance results for fp-bench:
1. Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
- before:
div-single: 34.84 MFlops
div-double: 34.04 MFlops
- after:
div-single: 275.23 MFlops
div-double: 216.38 MFlops
2. ARM Aarch64 A57 @ 2.4GHz
- before:
div-single: 9.33 MFlops
div-double: 9.30 MFlops
- after:
div-single: 51.55 MFlops
div-double: 15.09 MFlops
3. IBM POWER8E @ 2.1 GHz
- before:
div-single: 25.65 MFlops
div-double: 24.91 MFlops
- after:
div-single: 96.83 MFlops
div-double: 31.01 MFlops
Here setting 2FP64_USE_FP to 1 pays off for x86_64:
[1] 215.97 vs [0] 62.15 MFlops
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
-rw-r--r-- | fpu/softfloat.c | 64 |
1 files changed, 62 insertions, 2 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index dad2ce2d9f..82294458fe 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -1628,7 +1628,8 @@ float16 float16_div(float16 a, float16 b, float_status *status) return float16_round_pack_canonical(pr, status); } -float32 float32_div(float32 a, float32 b, float_status *status) +static float32 QEMU_SOFTFLOAT_ATTR +soft_f32_div(float32 a, float32 b, float_status *status) { FloatParts pa = float32_unpack_canonical(a, status); FloatParts pb = float32_unpack_canonical(b, status); @@ -1637,7 +1638,8 @@ float32 float32_div(float32 a, float32 b, float_status *status) return float32_round_pack_canonical(pr, status); } -float64 float64_div(float64 a, float64 b, float_status *status) +static float64 QEMU_SOFTFLOAT_ATTR +soft_f64_div(float64 a, float64 b, float_status *status) { FloatParts pa = float64_unpack_canonical(a, status); FloatParts pb = float64_unpack_canonical(b, status); @@ -1646,6 +1648,64 @@ float64 float64_div(float64 a, float64 b, float_status *status) return float64_round_pack_canonical(pr, status); } +static float hard_f32_div(float a, float b) +{ + return a / b; +} + +static double hard_f64_div(double a, double b) +{ + return a / b; +} + +static bool f32_div_pre(union_float32 a, union_float32 b) +{ + if (QEMU_HARDFLOAT_2F32_USE_FP) { + return (fpclassify(a.h) == FP_NORMAL || fpclassify(a.h) == FP_ZERO) && + fpclassify(b.h) == FP_NORMAL; + } + return float32_is_zero_or_normal(a.s) && float32_is_normal(b.s); +} + +static bool f64_div_pre(union_float64 a, union_float64 b) +{ + if (QEMU_HARDFLOAT_2F64_USE_FP) { + return (fpclassify(a.h) == FP_NORMAL || fpclassify(a.h) == FP_ZERO) && + fpclassify(b.h) == FP_NORMAL; + } + return float64_is_zero_or_normal(a.s) && float64_is_normal(b.s); +} + +static bool f32_div_post(union_float32 a, union_float32 b) +{ + if (QEMU_HARDFLOAT_2F32_USE_FP) { + return fpclassify(a.h) != FP_ZERO; + } + return !float32_is_zero(a.s); +} + +static bool f64_div_post(union_float64 a, union_float64 b) +{ + if (QEMU_HARDFLOAT_2F64_USE_FP) { + return fpclassify(a.h) != FP_ZERO; + } + return !float64_is_zero(a.s); +} + +float32 QEMU_FLATTEN +float32_div(float32 a, float32 b, float_status *s) +{ + return float32_gen2(a, b, s, hard_f32_div, soft_f32_div, + f32_div_pre, f32_div_post, NULL, NULL); +} + +float64 QEMU_FLATTEN +float64_div(float64 a, float64 b, float_status *s) +{ + return float64_gen2(a, b, s, hard_f64_div, soft_f64_div, + f64_div_pre, f64_div_post, NULL, NULL); +} + /* * Float to Float conversions * |