[Libclc-dev] [PATCH 2/2] math: Add ldexp implementation
Aaron Watry
awatry at gmail.com
Mon Mar 16 08:07:51 PDT 2015
On Mon, Mar 16, 2015 at 8:59 AM, Tom Stellard <tom at stellard.net> wrote:
> On Fri, Mar 13, 2015 at 09:50:56AM -0500, Aaron Watry wrote:
> > On Thu, Mar 12, 2015 at 10:13 PM, Tom Stellard <tom at stellard.net> wrote:
> >
> > > On Thu, Mar 12, 2015 at 08:48:13PM -0500, Aaron Watry wrote:
> > > > Signed-off-by: Aaron Watry <awatry at gmail.com>
> > > > ---
> > > > generic/include/clc/clc.h | 1 +
> > > > generic/include/clc/math/binary_decl.inc | 18 ++++-
> > > > generic/include/clc/math/gentype_tss.inc | 108
> > > +++++++++++++++++++++++++++++
> > > > generic/include/clc/math/ldexp.h | 9 +++
> > > > generic/lib/SOURCES | 1 +
> > > > generic/lib/clcmacro.h | 26 +++++++
> > > > generic/lib/math/ldexp.cl | 114
> > > +++++++++++++++++++++++++++++++
> > >
> > > I just sent out a patch implementing an optimized ldexp for R600/SI.
> > > I was able create the declarations and definitions without having to
> > > modify too many of the *.inc files or adding new macros to clcmacro.h
> > >
> > > I think we should try a similar approach for the generic version.
> > >
> > >
> > Fair enough. We might as well piggy-back on what you did for the R600/SI
> > version.
> >
> >
> > > > 7 files changed, 274 insertions(+), 3 deletions(-)
> > > > create mode 100644 generic/include/clc/math/gentype_tss.inc
> > > > create mode 100644 generic/include/clc/math/ldexp.h
> > > > create mode 100644 generic/lib/math/ldexp.cl
> > > >
> > > > diff --git a/generic/include/clc/clc.h b/generic/include/clc/clc.h
> > > > index 1c12cf3..ecabcf1 100644
> > > > --- a/generic/include/clc/clc.h
> > > > +++ b/generic/include/clc/clc.h
> > > > @@ -51,6 +51,7 @@
> > > > #include <clc/math/fmin.h>
> > > > #include <clc/math/fmod.h>
> > > > #include <clc/math/hypot.h>
> > > > +#include <clc/math/ldexp.h>
> > > > #include <clc/math/log.h>
> > > > #include <clc/math/log10.h>
> > > > #include <clc/math/log1p.h>
> > > > diff --git a/generic/include/clc/math/binary_decl.inc
> > > b/generic/include/clc/math/binary_decl.inc
> > > > index 70a7114..1805527 100644
> > > > --- a/generic/include/clc/math/binary_decl.inc
> > > > +++ b/generic/include/clc/math/binary_decl.inc
> > > > @@ -1,6 +1,18 @@
> > > > -_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE __CLC_FUNCTION(__CLC_GENTYPE
> a,
> > > __CLC_GENTYPE b);
> > > > -_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE __CLC_FUNCTION(__CLC_GENTYPE
> a,
> > > float b);
> > > > +#ifdef __CLC_INT_GENTYPE
> > > > + #if !defined(__CLC_SCALAR)
> > > > + _CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE
> __CLC_FUNCTION(__CLC_GENTYPE
> > > a, __CLC_INT_GENTYPE b);
> > > > + #endif
> > > > + _CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE
> __CLC_FUNCTION(__CLC_GENTYPE
> > > a, __CLC_SCALAR_INT_TYPE b);
> > > > +
> > > > +#else
> > > > +
> > > > +#if !defined(__CLC_SCALAR)
> > > > + _CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE
> __CLC_FUNCTION(__CLC_GENTYPE a,
> > > __CLC_GENTYPE b);
> > > > +#endif
> > > > + _CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE
> __CLC_FUNCTION(__CLC_GENTYPE a,
> > > float b);
> > > >
> > > > #ifdef cl_khr_fp64
> > > > -_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE __CLC_FUNCTION(__CLC_GENTYPE
> a,
> > > double b);
> > > > + _CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE
> __CLC_FUNCTION(__CLC_GENTYPE a,
> > > double b);
> > > > +#endif
> > > > +
> > > > #endif
> > > > diff --git a/generic/include/clc/math/gentype_tss.inc
> > > b/generic/include/clc/math/gentype_tss.inc
> > > > new file mode 100644
> > > > index 0000000..11ec9ff
> > > > --- /dev/null
> > > > +++ b/generic/include/clc/math/gentype_tss.inc
> > > > @@ -0,0 +1,108 @@
> > > > +/* Used to provide support for multi-arg functions where the
> argument
> > > types and/or sizes do NOT match
> > > > + *
> > > > + * e.g. ldexp(float16,int), ldexp(float16,int16), ldexp(double8,
> int)
> > > > + *
> > > > + * In general, consumers of this include will probably have versions
> > > with a vector first argument, and then
> > > > + * vector/scalar 2nd argument which may have an entirely different
> base
> > > type.
> > > > + */
> > > > +
> > > > +#define __CLC_SCALAR_GENTYPE float
> > > > +#ifndef __CLC_SCALAR_INT_TYPE
> > > > + #define __CLC_UNDEF_SCALAR_INT_TYPE
> > > > + #define __CLC_SCALAR_INT_TYPE int
> > > > +#endif
> > > > +#define __CLC_FPSIZE 32
> > > > +
> > > > +#define __CLC_GENTYPE float
> > > > +#define __CLC_INT_GENTYPE int
> > > > +#define __CLC_SCALAR
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +#undef __CLC_SCALAR
> > > > +
> > > > +#define __CLC_GENTYPE float2
> > > > +#define __CLC_INT_GENTYPE int2
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE float3
> > > > +#define __CLC_INT_GENTYPE int3
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE float4
> > > > +#define __CLC_INT_GENTYPE int4
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE float8
> > > > +#define __CLC_INT_GENTYPE int8
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE float16
> > > > +#define __CLC_INT_GENTYPE int16
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#undef __CLC_FPSIZE
> > > > +#undef __CLC_SCALAR_GENTYPE
> > > > +
> > > > +#ifdef cl_khr_fp64
> > > > +#define __CLC_SCALAR_GENTYPE double
> > > > +#define __CLC_FPSIZE 64
> > > > +
> > > > +#define __CLC_SCALAR
> > > > +#define __CLC_GENTYPE double
> > > > +#define __CLC_INT_GENTYPE int
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_SCALAR
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE double2
> > > > +#define __CLC_INT_GENTYPE int2
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE double3
> > > > +#define __CLC_INT_GENTYPE int3
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE double4
> > > > +#define __CLC_INT_GENTYPE int4
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE double8
> > > > +#define __CLC_INT_GENTYPE int8
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#define __CLC_GENTYPE double16
> > > > +#define __CLC_INT_GENTYPE int16
> > > > +#include __CLC_BODY
> > > > +#undef __CLC_GENTYPE
> > > > +#undef __CLC_INT_GENTYPE
> > > > +
> > > > +#undef __CLC_FPSIZE
> > > > +#undef __CLC_SCALAR_GENTYPE
> > > > +#endif
> > > > +
> > > > +#ifdef __CLC_UNDEF_SCALAR_INT_TYPE
> > > > + #undef __CLC_SCALAR_INT_TYPE
> > > > + #undef __CLC_UNDEF_SCALAR_INT_TYPE
> > > > +#endif
> > > > +
> > > > +#undef __CLC_BODY
> > > > diff --git a/generic/include/clc/math/ldexp.h
> > > b/generic/include/clc/math/ldexp.h
> > > > new file mode 100644
> > > > index 0000000..2e3b502
> > > > --- /dev/null
> > > > +++ b/generic/include/clc/math/ldexp.h
> > > > @@ -0,0 +1,9 @@
> > > > +#define __CLC_BODY <clc/math/binary_decl.inc>
> > > > +#define __CLC_FUNCTION ldexp
> > > > +
> > > > +#include <clc/math/gentype_tss.inc>
> > > > +
> > > > +#undef __CLC_BODY
> > > > +#undef __CLC_FUNCTION
> > > > +
> > > > +#undef __CLC_ARG2_BASE_TYPE
> > > > \ No newline at end of file
> > > > diff --git a/generic/lib/SOURCES b/generic/lib/SOURCES
> > > > index 0110e15..be6865e 100644
> > > > --- a/generic/lib/SOURCES
> > > > +++ b/generic/lib/SOURCES
> > > > @@ -70,6 +70,7 @@ math/fmax.cl
> > > > math/fmin.cl
> > > > math/fmod.cl
> > > > math/hypot.cl
> > > > +math/ldexp.cl
> > > > math/log10.cl
> > > > math/log1p.cl
> > > > math/mad.cl
> > > > diff --git a/generic/lib/clcmacro.h b/generic/lib/clcmacro.h
> > > > index 346adf2..3f389e5 100644
> > > > --- a/generic/lib/clcmacro.h
> > > > +++ b/generic/lib/clcmacro.h
> > > > @@ -41,6 +41,28 @@
> > > > return (RET_TYPE##16)(FUNCTION(x.lo, y.lo), FUNCTION(x.hi,
> y.hi)); \
> > > > }
> > > >
> > > > +#define _CLC_BINARY_VECTORIZE_SCALAR_SECOND_ARG(DECLSPEC, RET_TYPE,
> > > FUNCTION, ARG1_TYPE, ARG2_TYPE) \
> > > > + DECLSPEC RET_TYPE##2 FUNCTION(ARG1_TYPE##2 x, ARG2_TYPE y) { \
> > > > + return (RET_TYPE##2)(FUNCTION(x.x, y), FUNCTION(x.y, y)); \
> > > > + } \
> > > > +\
> > > > + DECLSPEC RET_TYPE##3 FUNCTION(ARG1_TYPE##3 x, ARG2_TYPE y) { \
> > > > + return (RET_TYPE##3)(FUNCTION(x.x, y), FUNCTION(x.y, y), \
> > > > + FUNCTION(x.z, y)); \
> > > > + } \
> > > > +\
> > > > + DECLSPEC RET_TYPE##4 FUNCTION(ARG1_TYPE##4 x, ARG2_TYPE y) { \
> > > > + return (RET_TYPE##4)(FUNCTION(x.lo, y), FUNCTION(x.hi, y)); \
> > > > + } \
> > > > +\
> > > > + DECLSPEC RET_TYPE##8 FUNCTION(ARG1_TYPE##8 x, ARG2_TYPE y) { \
> > > > + return (RET_TYPE##8)(FUNCTION(x.lo, y), FUNCTION(x.hi, y)); \
> > > > + } \
> > > > +\
> > > > + DECLSPEC RET_TYPE##16 FUNCTION(ARG1_TYPE##16 x, ARG2_TYPE y) { \
> > > > + return (RET_TYPE##16)(FUNCTION(x.lo, y), FUNCTION(x.hi, y)); \
> > > > + }
> > > > +
> > > > #define _CLC_V_S_V_VECTORIZE(DECLSPEC, RET_TYPE, FUNCTION,
> ARG1_TYPE,
> > > ARG2_TYPE) \
> > > > DECLSPEC RET_TYPE##2 FUNCTION(ARG1_TYPE x, ARG2_TYPE##2 y) { \
> > > > return (RET_TYPE##2)(FUNCTION(x, y.lo), FUNCTION(x, y.hi)); \
> > > > @@ -115,6 +137,10 @@ _CLC_DEF _CLC_OVERLOAD RET_TYPE
> FUNCTION(ARG1_TYPE
> > > x, ARG2_TYPE y) { \
> > > > } \
> > > > _CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, RET_TYPE, FUNCTION,
> > > ARG1_TYPE, ARG2_TYPE)
> > > >
> > > > +#define _CLC_DEFINE_BINARY_BUILTIN_WITH_SCALAR_SECOND_ARG(RET_TYPE,
> > > FUNCTION, BUILTIN, ARG1_TYPE, ARG2_TYPE) \
> > > > +_CLC_DEFINE_BINARY_BUILTIN(RET_TYPE, FUNCTION, BUILTIN, ARG1_TYPE,
> > > ARG2_TYPE) \
> > > > +_CLC_BINARY_VECTORIZE_SCALAR_SECOND_ARG(_CLC_OVERLOAD _CLC_DEF,
> > > RET_TYPE, FUNCTION, ARG1_TYPE, ARG2_TYPE)
> > > > +
> > > > #define _CLC_DEFINE_UNARY_BUILTIN(RET_TYPE, FUNCTION, BUILTIN,
> > > ARG1_TYPE) \
> > > > _CLC_DEF _CLC_OVERLOAD RET_TYPE FUNCTION(ARG1_TYPE x) { \
> > > > return BUILTIN(x); \
> > > > diff --git a/generic/lib/math/ldexp.cl b/generic/lib/math/ldexp.cl
> > > > new file mode 100644
> > > > index 0000000..b7c5a92
> > > > --- /dev/null
> > > > +++ b/generic/lib/math/ldexp.cl
> > > > @@ -0,0 +1,114 @@
> > > > +/*
> > > > + * Copyright (c) 2014 Advanced Micro Devices, Inc.
> > > > + *
> > > > + * Permission is hereby granted, free of charge, to any person
> > > obtaining a copy
> > > > + * of this software and associated documentation files (the
> > > "Software"), to deal
> > > > + * in the Software without restriction, including without limitation
> > > the rights
> > > > + * to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> > > sell
> > > > + * copies of the Software, and to permit persons to whom the
> Software is
> > > > + * furnished to do so, subject to the following conditions:
> > > > + *
> > > > + * The above copyright notice and this permission notice shall be
> > > included in
> > > > + * all copies or substantial portions of the Software.
> > > > + *
> > > > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> > > EXPRESS OR
> > > > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> > > MERCHANTABILITY,
> > > > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
> > > SHALL THE
> > > > + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
> > > OTHER
> > > > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> > > ARISING FROM,
> > > > + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> > > DEALINGS IN
> > > > + * THE SOFTWARE.
> > > > + */
> > > > +
> > > > +#include <clc/clc.h>
> > > > +#include "../clcmacro.h"
> > > > +#include "math.h"
> > > > +
> > > > +_CLC_DEF _CLC_OVERLOAD float ldexp(float x, int n) {
> > >
> > > I think this is where we need to integrate with my subnormal helper
> > > patches to add denormal flushing. I can give this a try if you want.
> > >
> > >
> > Go for it. I did notice that your denormal patch always reports false
> for
> > 16/32-bit float denormal support, so this will always fall into the same
> > code path regardless for float ldexp. It's just doubles which have a
> call
> > into llvm to check if the hardware supports subnormals.
> >
>
> My patch just implemented the defaults required by the OpenCL spec.
> Targets
> will be able to override these if they want.
>
>
> > Bit of a question: If the hardware supports subnormals, do we just not
> > need the subnormal support code?
>
> We are not required by the spec to include the subnormal support code if
> subnormals are supported. However, if we want to support the
> -cl-denorms-are-zero flag, we will need the subnormal support code.
>
> Note that spec does not require us to do anything when this flag is passed,
> so supporting this flag is not required for compliance, it is just
> for enabling optimizations in some cases.
> Supporting this flag is very low priority for me.
>
> >
> > I noticed in quite a few of the amd builtins that subnormal support is
> > explicitly tested for, but in the ldexp case, the code below is straight
> > from the AMD built-in (doesn't have a check for if the hardware supports
> > subnormals or not). I guess it's possible that the ldexp implementation
> > was done in such a way that it didn't matter if the hardware supports
> > subnormals or not, and we're leaving missing out on possible performance
> by
> > always running the code as written when we have hardware with subnormal
> > support.
>
> In the ldexp implementation, I think the code inside the #if 0
> block was handling denormals:
>
>
> http://llvm.org/viewvc/llvm-project/libclc/branches/amd-builtins/amd-builtins/math32/ldexpF.cl?view=co
>
Wow, I'm blind. I was looking at that exact file as I wrote up my previous
email, and I totally glossed over the #if 0 section. I'm guessing because
my IDE highlighted it as a comment/dead-code and, well, because it was
Friday morning before coffee....
--Aaron
>
> -Tom
>
> >
> > In summary, floating point isn't my strongest area, and without
> wikipedia,
> > wolfram, and other sites to explain some of these algorithms, I'd be
> > hopeless :)
> >
> > --Aaron
> >
> > -Tom
> > >
> > >
> > > > + /* supports denormal values */
> > > > + const int multiplier = 24;
> > > > + float val_f;
> > > > + uint val_ui;
> > > > + uint sign;
> > > > + int exponent;
> > > > + val_ui = as_uint(x);
> > > > + sign = val_ui & 0x80000000;
> > > > + val_ui = val_ui & 0x7fffffff;/* remove the sign bit */
> > > > + int val_x = val_ui;
> > > > +
> > > > + exponent = val_ui >> 23; /* get the exponent */
> > > > + int dexp = exponent;
> > > > +
> > > > + /* denormal support */
> > > > + int fbh = 127 - (as_uint((float)(as_float(val_ui | 0x3f800000)
> -
> > > 1.0f)) >> 23);
> > > > + int dexponent = 25 - fbh;
> > > > + uint dval_ui = (( (val_ui << fbh) & 0x007fffff) | (dexponent <<
> > > 23));
> > > > + int ex = dexponent + n - multiplier;
> > > > + dexponent = ex;
> > > > + uint val = sign | (ex << 23) | (dval_ui & 0x007fffff);
> > > > + int ex1 = dexponent + multiplier;
> > > > + ex1 = -ex1 +25;
> > > > + dval_ui = (((dval_ui & 0x007fffff )| 0x800000) >> ex1);
> > > > + dval_ui = dexponent > 0 ? val :dval_ui;
> > > > + dval_ui = dexponent > 254 ? 0x7f800000 :dval_ui; /*overflow*/
> > > > + dval_ui = dexponent < -multiplier ? 0 : dval_ui; /*underflow*/
> > > > + dval_ui = dval_ui | sign;
> > > > + val_f = as_float(dval_ui);
> > > > +
> > > > + exponent += n;
> > > > +
> > > > + val = sign | (exponent << 23) | (val_ui & 0x007fffff);
> > > > + ex1 = exponent + multiplier;
> > > > + ex1 = -ex1 +25;
> > > > + val_ui = (((val_ui & 0x007fffff )| 0x800000) >> ex1);
> > > > + val_ui = exponent > 0 ? val :val_ui;
> > > > + val_ui = exponent > 254 ? 0x7f800000 :val_ui; /*overflow*/
> > > > + val_ui = exponent < -multiplier ? 0 : val_ui; /*underflow*/
> > > > + val_ui = val_ui | sign;
> > > > +
> > > > + val_ui = dexp == 0? dval_ui : val_ui;
> > > > + val_f = as_float(val_ui);
> > > > +
> > > > + val_f = isnan(x) | isinf(x) | val_x == 0 ? x : val_f;
> > > > + return val_f;
> > > > +}
> > > > +_CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, ldexp, float,
> int)
> > > > +_CLC_BINARY_VECTORIZE_SCALAR_SECOND_ARG(_CLC_OVERLOAD _CLC_DEF,
> float,
> > > ldexp, float, int)
> > > > +
> > > > +#ifdef cl_khr_fp64
> > > > +
> > > > +#pragma OPENCL EXTENSION cl_khr_fp64 : enable
> > > > +
> > > > +_CLC_DEF _CLC_OVERLOAD double ldexp(double x, int n) {
> > > > + long l = as_ulong(x);
> > > > + int e = (l >> 52) & 0x7ff;
> > > > + long s = l & 0x8000000000000000;
> > > > +
> > > > + ulong ux = as_ulong(x * 0x1.0p+53);
> > > > + int de = ((int)(ux >> 52) & 0x7ff) - 53;
> > > > + int c = e == 0;
> > > > + e = c ? de: e;
> > > > +
> > > > + ux = c ? ux : l;
> > > > +
> > > > + int v = e + n;
> > > > + v = clamp(v, -0x7ff, 0x7ff);
> > > > +
> > > > + ux &= ~EXPBITS_DP64;
> > > > +
> > > > + double mr = as_double(ux | ((ulong)(v+53) << 52));
> > > > + mr = mr * 0x1.0p-53;
> > > > +
> > > > + mr = v > 0 ? as_double(ux | ((ulong)v << 52)) : mr;
> > > > +
> > > > + mr = v == 0x7ff ? as_double(s | PINFBITPATT_DP64) : mr;
> > > > + mr = v < -53 ? as_double(s) : mr;
> > > > +
> > > > + mr = ((n == 0) | isinf(x) | (x == 0) ) ? x : mr;
> > > > + return mr;
> > > > +}
> > > > +
> > > > +_CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, ldexp, double,
> > > int)
> > > > +_CLC_BINARY_VECTORIZE_SCALAR_SECOND_ARG(_CLC_OVERLOAD _CLC_DEF,
> double,
> > > ldexp, double, int)
> > > > +
> > > > +#endif
> > > > --
> > > > 2.2.0
> > > >
> > > >
> > > > _______________________________________________
> > > > Libclc-dev mailing list
> > > > Libclc-dev at pcc.me.uk
> > > > http://www.pcc.me.uk/cgi-bin/mailman/listinfo/libclc-dev
> > >
>
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