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Functions
#include <cmath>
#include <cstdint>
#include <cstdlib>
#include <algorithm>
+ Include dependency graph for scalar.h:
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Description

Scalar float functions corresponding to GROMACS SIMD functions.

These versions make it possible to write functions that are templated with either a SIMD or scalar type. While some of these functions might not appear SIMD-specific, we have placed them here because the only reason to use these instead of generic function is in templated combined SIMD/non-SIMD code.

There are a handful of limitations, in particular that it is impossible to overload the bitwise logical operators on built-in types.

Author
Erik Lindahl erik..nosp@m.lind.nosp@m.ahl@g.nosp@m.mail.nosp@m..com

Functions

static void gmx::store (float *m, float a)
 Store contents of float variable to aligned memory m. More...
 
static void gmx::storeU (float *m, float a)
 Store contents of float variable to unaligned memory m. More...
 
static float gmx::fma (float a, float b, float c)
 Float Fused-multiply-add. Result is a*b + c. More...
 
static float gmx::fms (float a, float b, float c)
 Float Fused-multiply-subtract. Result is a*b - c. More...
 
static float gmx::fnma (float a, float b, float c)
 Float Fused-negated-multiply-add. Result is -a*b + c. More...
 
static float gmx::fnms (float a, float b, float c)
 Float Fused-negated-multiply-subtract. Result is -a*b - c. More...
 
static float gmx::maskAdd (float a, float b, float m)
 Add two float variables, masked version. More...
 
static float gmx::maskzMul (float a, float b, float m)
 Multiply two float variables, masked version. More...
 
static float gmx::maskzFma (float a, float b, float c, float m)
 Float fused multiply-add, masked version. More...
 
static float gmx::abs (float a)
 Float Floating-point abs(). More...
 
static float gmx::max (float a, float b)
 Set each float element to the largest from two variables. More...
 
static float gmx::min (float a, float b)
 Set each float element to the smallest from two variables. More...
 
static float gmx::round (float a)
 Float round to nearest integer value (in floating-point format). More...
 
static float gmx::trunc (float a)
 Truncate float, i.e. round towards zero - common hardware instruction. More...
 
static float gmx::reduce (float a)
 Return sum of all elements in float variable (i.e., the variable itself). More...
 
static float gmx::andNot (float a, float b)
 Bitwise andnot for two scalar float variables. More...
 
static bool gmx::testBits (float a)
 Return true if any bits are set in the float variable. More...
 
static bool gmx::anyTrue (bool a)
 Returns if the boolean is true. More...
 
static float gmx::selectByMask (float a, bool mask)
 Select from single precision variable where boolean is true. More...
 
static float gmx::selectByNotMask (float a, bool mask)
 Select from single precision variable where boolean is false. More...
 
static float gmx::blend (float a, float b, float sel)
 Blend float selection. More...
 
static std::int32_t gmx::cvtR2I (float a)
 Round single precision floating point to integer. More...
 
static std::int32_t gmx::cvttR2I (float a)
 Truncate single precision floating point to integer. More...
 
static std::int32_t gmx::cvtI2R (std::int32_t a)
 Return integer. More...
 
static void gmx::store (double *m, double a)
 Store contents of double variable to aligned memory m. More...
 
static void gmx::storeU (double *m, double a)
 Store contents of double variable to unaligned memory m. More...
 
static double gmx::fma (double a, double b, double c)
 double Fused-multiply-add. Result is a*b + c. More...
 
static double gmx::fms (double a, double b, double c)
 double Fused-multiply-subtract. Result is a*b - c. More...
 
static double gmx::fnma (double a, double b, double c)
 double Fused-negated-multiply-add. Result is - a*b + c. More...
 
static double gmx::fnms (double a, double b, double c)
 double Fused-negated-multiply-subtract. Result is -a*b - c. More...
 
static double gmx::maskAdd (double a, double b, double m)
 Add two double variables, masked version. More...
 
static double gmx::maskzMul (double a, double b, double m)
 Multiply two double variables, masked version. More...
 
static double gmx::maskzFma (double a, double b, double c, double m)
 double fused multiply-add, masked version. More...
 
static double gmx::abs (double a)
 double doubleing-point abs(). More...
 
static double gmx::max (double a, double b)
 Set each double element to the largest from two variables. More...
 
static double gmx::min (double a, double b)
 Set each double element to the smallest from two variables. More...
 
static double gmx::round (double a)
 double round to nearest integer value (in doubleing-point format). More...
 
static double gmx::trunc (double a)
 Truncate double, i.e. round towards zero - common hardware instruction. More...
 
static double gmx::reduce (double a)
 Return sum of all elements in double variable (i.e., the variable itself). More...
 
static double gmx::andNot (double a, double b)
 Bitwise andnot for two scalar double variables. More...
 
static bool gmx::testBits (double a)
 Return true if any bits are set in the double variable. More...
 
static double gmx::selectByMask (double a, bool mask)
 Select from double precision variable where boolean is true. More...
 
static double gmx::selectByNotMask (double a, bool mask)
 Select from double precision variable where boolean is false. More...
 
static double gmx::blend (double a, double b, double sel)
 Blend double selection. More...
 
static std::int32_t gmx::cvtR2I (double a)
 Round single precision doubleing point to integer. More...
 
static std::int32_t gmx::cvttR2I (double a)
 Truncate single precision doubleing point to integer. More...
 
static double gmx::cvtF2D (float a)
 Convert float to double (mimicks SIMD conversion) More...
 
static float gmx::cvtD2F (double a)
 Convert double to float (mimicks SIMD conversion) More...
 
static void gmx::store (std::int32_t *m, std::int32_t a)
 Store contents of integer variable to aligned memory m. More...
 
static void gmx::storeU (std::int32_t *m, std::int32_t a)
 Store contents of integer variable to unaligned memory m. More...
 
static std::int32_t gmx::andNot (std::int32_t a, std::int32_t b)
 Bitwise andnot for two scalar integer variables. More...
 
static bool gmx::testBits (std::int32_t a)
 Return true if any bits are set in the integer variable. More...
 
static std::int32_t gmx::selectByMask (std::int32_t a, bool mask)
 Select from integer variable where boolean is true. More...
 
static std::int32_t gmx::selectByNotMask (std::int32_t a, bool mask)
 Select from integer variable where boolean is false. More...
 
static std::int32_t gmx::blend (std::int32_t a, std::int32_t b, float sel)
 Blend integer selection. More...
 
static bool gmx::cvtB2IB (bool a)
 Just return a boolean (mimicks SIMD real-to-int bool conversions) More...
 
static bool gmx::cvtIB2B (bool a)
 Just return a boolean (mimicks SIMD int-to-real bool conversions) More...