mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-06 05:29:55 +00:00
af905efc61
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105315 91177308-0d34-0410-b5e6-96231b3b80d8
346 lines
7.3 KiB
C++
346 lines
7.3 KiB
C++
//===- NeonEmitter.cpp - Generate arm_neon.h for use with clang -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tablegen backend is responsible for emitting arm_neon.h, which includes
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// a declaration and definition of each function specified by the ARM NEON
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// compiler interface. See ARM document DUI0348B.
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//
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//===----------------------------------------------------------------------===//
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#include "NeonEmitter.h"
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#include "Record.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringMap.h"
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#include <string>
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using namespace llvm;
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static void ParseTypes(Record *r, std::string &s,
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SmallVectorImpl<StringRef> &TV) {
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const char *data = s.data();
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int len = 0;
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for (unsigned i = 0, e = s.size(); i != e; ++i, ++len) {
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if (data[len] == 'P' || data[len] == 'Q' || data[len] == 'U')
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continue;
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switch (data[len]) {
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case 'c':
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case 's':
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case 'i':
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case 'l':
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case 'h':
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case 'f':
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break;
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default:
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throw TGError(r->getLoc(),
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"Unexpected letter: " + std::string(data + len, 1));
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break;
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}
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TV.push_back(StringRef(data, len + 1));
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data += len + 1;
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len = -1;
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}
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}
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static const char Widen(const char t) {
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switch (t) {
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case 'c':
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return 's';
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case 's':
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return 'i';
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case 'i':
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return 'l';
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default: throw "unhandled type in widen!";
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}
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return '\0';
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}
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static char ClassifyType(StringRef ty, bool &quad, bool &poly, bool &usgn) {
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unsigned off = 0;
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// remember quad.
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if (ty[off] == 'Q') {
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quad = true;
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++off;
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}
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// remember poly.
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if (ty[off] == 'P') {
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poly = true;
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++off;
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}
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// remember unsigned.
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if (ty[off] == 'U') {
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usgn = true;
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++off;
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}
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// base type to get the type string for.
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return ty[off];
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}
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static std::string TypeString(const char mod, StringRef typestr) {
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bool quad = false;
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bool poly = false;
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bool usgn = false;
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bool scal = false;
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bool cnst = false;
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bool pntr = false;
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// base type to get the type string for.
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char type = ClassifyType(typestr, quad, poly, usgn);
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// Based on the modifying character, change the type and width if necessary.
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switch (mod) {
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case 'v':
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type = 'v';
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scal = true;
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usgn = false;
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break;
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case 't':
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if (poly) {
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poly = false;
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usgn = true;
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}
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break;
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case 'x':
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usgn = true;
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if (type == 'f')
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type = 'i';
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break;
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case 'f':
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type = 'f';
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break;
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case 'w':
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type = Widen(type);
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quad = true;
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break;
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case 'n':
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type = Widen(type);
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break;
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case 'i':
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type = 'i';
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scal = true;
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usgn = false;
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break;
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case 'l':
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type = 'l';
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scal = true;
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usgn = true;
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break;
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case 's':
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scal = true;
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break;
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case 'k':
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quad = true;
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break;
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case 'c':
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cnst = true;
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case 'p':
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pntr = true;
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scal = true;
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break;
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default:
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break;
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}
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SmallString<128> s;
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if (usgn)
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s.push_back('u');
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switch (type) {
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case 'c':
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s += poly ? "poly8" : "int8";
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if (scal)
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break;
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s += quad ? "x16" : "x8";
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break;
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case 's':
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s += poly ? "poly16" : "int16";
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if (scal)
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break;
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s += quad ? "x8" : "x4";
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break;
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case 'i':
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s += "int32";
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if (scal)
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break;
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s += quad ? "x4" : "x2";
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break;
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case 'l':
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s += "int64";
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if (scal)
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break;
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s += quad ? "x2" : "x1";
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break;
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case 'h':
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s += "float16";
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if (scal)
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break;
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s += quad ? "x8" : "x4";
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break;
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case 'f':
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s += "float32";
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if (scal)
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break;
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s += quad ? "x4" : "x2";
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break;
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case 'v':
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s += "void";
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break;
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default:
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throw "unhandled type!";
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break;
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}
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if (mod == '2')
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s += "x2";
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if (mod == '3')
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s += "x3";
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if (mod == '4')
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s += "x4";
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// Append _t, finishing the type string typedef type.
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s += "_t";
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if (cnst)
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s += " const";
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if (pntr)
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s += " *";
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return s.str();
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}
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// Turn "vst2_lane" into "vst2q_lane_f32", etc.
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static std::string MangleName(const std::string &name, StringRef typestr) {
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bool quad = false;
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bool poly = false;
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bool usgn = false;
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char type = ClassifyType(typestr, quad, poly, usgn);
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std::string s = name;
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switch (type) {
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case 'c':
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s += poly ? "_p8" : usgn ? "_u8" : "_s8";
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break;
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case 's':
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s += poly ? "_p16" : usgn ? "_u16" : "_s16";
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break;
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case 'i':
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s += usgn ? "_u32" : "_s32";
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break;
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case 'l':
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s += usgn ? "_u64" : "_s64";
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break;
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case 'h':
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s += "_f16";
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break;
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case 'f':
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s += "_f32";
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break;
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default:
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throw "unhandled type!";
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break;
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}
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// Insert a 'q' before the first '_' character so that it ends up before
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// _lane or _n on vector-scalar operations.
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if (quad) {
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size_t pos = s.find('_');
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s = s.insert(pos, "q");
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}
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return s;
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}
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// Generate the string "(argtype a, argtype b, ...)"
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static std::string GenArgs(const std::string &proto, StringRef typestr) {
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char arg = 'a';
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std::string s;
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s += "(";
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for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
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s += TypeString(proto[i], typestr);
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s.push_back(' ');
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s.push_back(arg);
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if ((i + 1) < e)
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s += ", ";
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}
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s += ")";
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return s;
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}
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void NeonEmitter::run(raw_ostream &OS) {
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EmitSourceFileHeader("ARM NEON Header", OS);
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// FIXME: emit license into file?
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OS << "#ifndef __ARM_NEON_H\n";
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OS << "#define __ARM_NEON_H\n\n";
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OS << "#ifndef __ARM_NEON__\n";
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OS << "#error \"NEON support not enabled\"\n";
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OS << "#endif\n\n";
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OS << "#include <stdint.h>\n\n";
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// EmitTypedefs(OS);
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std::vector<Record*> RV = Records.getAllDerivedDefinitions("Inst");
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// Initialize Type Map
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// Unique the return+pattern types, and assign them.
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for (unsigned i = 0, e = RV.size(); i != e; ++i) {
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Record *R = RV[i];
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std::string name = LowercaseString(R->getName());
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std::string Proto = R->getValueAsString("Prototype");
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std::string Types = R->getValueAsString("Types");
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SmallVector<StringRef, 16> TypeVec;
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ParseTypes(R, Types, TypeVec);
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for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
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assert(!Proto.empty() && "");
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SmallString<128> Prototype;
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Prototype += TypeString(Proto[0], TypeVec[ti]);
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Prototype += " ";
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Prototype += MangleName(name, TypeVec[ti]);
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Prototype += GenArgs(Proto, TypeVec[ti]);
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OS << Prototype << ";\n";
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// gen definition
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// if (opcode)
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// gen opstring
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// gen builtin (args)
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}
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OS << "\n";
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}
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// TODO:
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// Unique the return+pattern types, and assign them to each record
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// Emit a #define for each unique "type" of intrinsic declaring all variants.
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// Emit a #define for each intrinsic mapping it to a particular type.
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OS << "\n#endif /* __ARM_NEON_H */\n";
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}
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