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[Qemu-devel] [PULL v3 11/15] hardfloat: implement float32/64 multiplicat
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [PULL v3 11/15] hardfloat: implement float32/64 multiplication |
Date: |
Mon, 17 Dec 2018 10:56:46 +0000 |
From: "Emilio G. Cota" <address@hidden>
Performance results for fp-bench:
1. Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
- before:
mul-single: 126.91 MFlops
mul-double: 118.28 MFlops
- after:
mul-single: 258.02 MFlops
mul-double: 197.96 MFlops
2. ARM Aarch64 A57 @ 2.4GHz
- before:
mul-single: 37.42 MFlops
mul-double: 38.77 MFlops
- after:
mul-single: 73.41 MFlops
mul-double: 76.93 MFlops
3. IBM POWER8E @ 2.1 GHz
- before:
mul-single: 58.40 MFlops
mul-double: 59.33 MFlops
- after:
mul-single: 60.25 MFlops
mul-double: 94.79 MFlops
Reviewed-by: Alex Bennée <address@hidden>
Signed-off-by: Emilio G. Cota <address@hidden>
Signed-off-by: Alex Bennée <address@hidden>
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 08afa861a7..dad2ce2d9f 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -1236,7 +1236,8 @@ float16 QEMU_FLATTEN float16_mul(float16 a, float16 b,
float_status *status)
return float16_round_pack_canonical(pr, status);
}
-float32 QEMU_FLATTEN float32_mul(float32 a, float32 b, float_status *status)
+static float32 QEMU_SOFTFLOAT_ATTR
+soft_f32_mul(float32 a, float32 b, float_status *status)
{
FloatParts pa = float32_unpack_canonical(a, status);
FloatParts pb = float32_unpack_canonical(b, status);
@@ -1245,7 +1246,8 @@ float32 QEMU_FLATTEN float32_mul(float32 a, float32 b,
float_status *status)
return float32_round_pack_canonical(pr, status);
}
-float64 QEMU_FLATTEN float64_mul(float64 a, float64 b, float_status *status)
+static float64 QEMU_SOFTFLOAT_ATTR
+soft_f64_mul(float64 a, float64 b, float_status *status)
{
FloatParts pa = float64_unpack_canonical(a, status);
FloatParts pb = float64_unpack_canonical(b, status);
@@ -1254,6 +1256,54 @@ float64 QEMU_FLATTEN float64_mul(float64 a, float64 b,
float_status *status)
return float64_round_pack_canonical(pr, status);
}
+static float hard_f32_mul(float a, float b)
+{
+ return a * b;
+}
+
+static double hard_f64_mul(double a, double b)
+{
+ return a * b;
+}
+
+static bool f32_mul_fast_test(union_float32 a, union_float32 b)
+{
+ return float32_is_zero(a.s) || float32_is_zero(b.s);
+}
+
+static bool f64_mul_fast_test(union_float64 a, union_float64 b)
+{
+ return float64_is_zero(a.s) || float64_is_zero(b.s);
+}
+
+static float32 f32_mul_fast_op(float32 a, float32 b, float_status *s)
+{
+ bool signbit = float32_is_neg(a) ^ float32_is_neg(b);
+
+ return float32_set_sign(float32_zero, signbit);
+}
+
+static float64 f64_mul_fast_op(float64 a, float64 b, float_status *s)
+{
+ bool signbit = float64_is_neg(a) ^ float64_is_neg(b);
+
+ return float64_set_sign(float64_zero, signbit);
+}
+
+float32 QEMU_FLATTEN
+float32_mul(float32 a, float32 b, float_status *s)
+{
+ return float32_gen2(a, b, s, hard_f32_mul, soft_f32_mul,
+ f32_is_zon2, NULL, f32_mul_fast_test, f32_mul_fast_op);
+}
+
+float64 QEMU_FLATTEN
+float64_mul(float64 a, float64 b, float_status *s)
+{
+ return float64_gen2(a, b, s, hard_f64_mul, soft_f64_mul,
+ f64_is_zon2, NULL, f64_mul_fast_test, f64_mul_fast_op);
+}
+
/*
* Returns the result of multiplying the floating-point values `a' and
* `b' then adding 'c', with no intermediate rounding step after the
--
2.17.1
- [Qemu-devel] [PULL v3 00/15] Hardfloat + softfloat maintainers update and gitdm, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 15/15] hardfloat: implement float32/64 comparison, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 12/15] hardfloat: implement float32/64 division, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 08/15] tests/fp: add fp-bench, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 09/15] fpu: introduce hardfloat, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 14/15] hardfloat: implement float32/64 square root, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 11/15] hardfloat: implement float32/64 multiplication,
Alex Bennée <=
- [Qemu-devel] [PULL v3 10/15] hardfloat: implement float32/64 addition and subtraction, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 07/15] softfloat: add float{32, 64}_is_zero_or_normal, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 06/15] softfloat: rename canonicalize to sf_canonicalize, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 01/15] contrib: add a basic gitdm config, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 05/15] target/tricore: use float32_is_denormal, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 04/15] softfloat: add float{32, 64}_is_{de, }normal, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 02/15] MAINTAINERS: update status of FPU emulation, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 03/15] fp-test: pick TARGET_ARM to get its specialization, Alex Bennée, 2018/12/17
- [Qemu-devel] [PULL v3 13/15] hardfloat: implement float32/64 fused multiply-add, Alex Bennée, 2018/12/17
- Re: [Qemu-devel] [PULL v3 00/15] Hardfloat + softfloat maintainers update and gitdm, Peter Maydell, 2018/12/18