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//===- subzero/crosstest/vectors.h - Common SIMD vector utilies -*- C++ -*-===//
// The Subzero Code Generator
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file provides declarations for PNaCl portable SIMD vector types. In
// addition, this file provides utilies that may be useful for crosstesting
// vector code.
#ifndef VECTORS_H
#define VECTORS_H
#include <sstream>
#include <stdint.h>
#include <string>
// The driver and the test program may be compiled by different
// versions of clang, with different standard libraries that have
// different definitions of int8_t. Specifically, int8_t may be
// typedef'd as either 'char' or 'signed char', which mangle to
// different strings. Avoid int8_t and use an explicit myint8_t.
typedef signed char myint8_t;
#include "vectors.def"
// PNaCl portable vector types
// Types declared: v4si32, v4ui32, v8si16, v8ui16, v16si8, v16ui8, v4f32
#define X(ty, eltty, castty) typedef eltty ty __attribute__((vector_size(16)));
#undef X
// i1 vector types are not native C++ SIMD vector types. Instead, for
// testing, they are expanded by the test code into native 128 bit
// SIMD vector types with the appropriate number of elements.
// Representing the types in Vectors<> requires a unique label for each
// type which this declaration provides.
// Types declared: v4i1, v8i1, v16i1
#define X(ty, expandedty, numelements) class ty;
#undef X
namespace {
template <typename T> struct Vectors;
// Vectors<T> provides information about a vector type with label T:
// * Vectors<T>::Ty is the C++ vector type
// * Vectors<T>::ElementTy is the C++ element type
// * Vectors<T>::CastTy is a type that is safe to cast elements to and from
// and is used for getting the representation of elements in ostreams
// * Vectors<T>::NumElements is the number of elements
// * Vectors<T>::TypeName is a string that names the type
template <> struct Vectors<LABEL> { \
typedef TY Ty; \
typedef ELTTY ElementTy; \
typedef CASTTY CastTy; \
static const size_t NumElements; \
static const char *const TypeName; \
}; \
const size_t Vectors<LABEL>::NumElements = NUM_ELEMENTS; \
const char *const Vectors<LABEL>::TypeName = #LABEL;
#define X(ty, eltty, castty) \
DECLARE_VECTOR_TYPE(ty, ty, eltty, castty, (sizeof(ty) / sizeof(eltty)))
#undef X
#define X(ty, expandedty, numelements) \
DECLARE_VECTOR_TYPE(ty, expandedty, bool, int64_t, numelements)
#undef X
// Return a string representation of the vector.
template <typename T>
std::string vectAsString(const typename Vectors<T>::Ty Vect) {
std::ostringstream OS;
for (size_t i = 0; i < Vectors<T>::NumElements; ++i) {
if (i > 0)
OS << " ";
OS << (typename Vectors<T>::CastTy)Vect[i];
return OS.str();
// In some crosstests, test vectors are deterministically constructed by
// selecting elements from a pool of scalar values based on a
// pseudorandom sequence. Testing all possible combinations of scalar
// values from the value pool is often not tractable.
// TODO: Replace with a portable PRNG from C++11.
class PRNG {
explicit PRNG(uint32_t Seed = 1) : State(Seed) {}
uint32_t operator()() {
// Lewis, Goodman, and Miller (1969)
State = (16807 * State) % 2147483647;
return State;
uint32_t State;
} // end anonymous namespace
#endif // VECTORS_H