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De-bootstrap the qfloat16 generator tool

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It doesn't really need Qt. So remove the dependency. I've confirmed that
the output is identical to what used to be generated.

This ought to be replaced by a script. Or just committed to Git, since
the generated output is not really supposed to change, ever.

Change-Id: I46363e5b8944459e8c48fffd158bb5d74fb6184c
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
This commit is contained in:
Thiago Macieira 2019-03-13 20:33:52 -07:00
parent 6492541df3
commit 26e5aa45e1
3 changed files with 44 additions and 56 deletions
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2
src/corelib/global/global.pri
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@ -129,7 +129,7 @@ QMAKE_QFLOAT16_TABLES_GENERATE = global/qfloat16.h
qtPrepareTool(QMAKE_QFLOAT16_TABLES, qfloat16-tables)
qfloat16_tables.commands = $$QMAKE_QFLOAT16_TABLES ${QMAKE_FILE_OUT}
qfloat16_tables.commands = $$QMAKE_QFLOAT16_TABLES > ${QMAKE_FILE_OUT}
qfloat16_tables.output = global/qfloat16tables.cpp
qfloat16_tables.depends = $$QMAKE_QFLOAT16_TABLES_EXE
qfloat16_tables.input = QMAKE_QFLOAT16_TABLES_GENERATE

96
src/tools/qfloat16-tables/gen_qfloat16_tables.cpp
View File

@ -1,6 +1,7 @@
/****************************************************************************
**
** Copyright (C) 2016 by Southwest Research Institute (R)
** Copyright (C) 2019 Intel Corporation.
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
@ -37,13 +38,13 @@
**
****************************************************************************/
#include <qfile.h>
#include <qdebug.h>
#include <stdint.h>
#include <stdio.h>
quint32 convertmantissa(qint32 i)
uint32_t convertmantissa(int32_t i)
{
quint32 m = i << 13; // Zero pad mantissa bits
quint32 e = 0; // Zero exponent
uint32_t m = i << 13; // Zero pad mantissa bits
uint32_t e = 0; // Zero exponent
while (!(m & 0x00800000)) { // While not normalized
e -= 0x00800000; // Decrement exponent (1<<23)
@ -56,60 +57,48 @@ quint32 convertmantissa(qint32 i)
// we first build these tables up and then print them out as a separate step in order
// to more closely map the implementation given in the paper.
quint32 basetable[512];
quint32 shifttable[512];
uint32_t basetable[512];
uint32_t shifttable[512];
#define PRINTHEX(a) "0x" + QByteArray::number(a,16).toUpper() + "U,\n"
qint32 main(qint32 argc, char **argv)
int main()
{
if (argc < 2) {
qWarning() << "Must provide output filename as argument.";
return -1;
}
uint32_t i;
QFile fid(QFile::decodeName(argv[1]));
if (!fid.open(QIODevice::WriteOnly | QIODevice::Text)) {
qWarning() << "Abort: Failed to open/create file" << fid.fileName();
return -1;
}
quint32 i;
printf("/* This file was generated by gen_qfloat16_tables.cpp */\n\n");
printf("#include <QtCore/qfloat16.h>\n\n");
fid.write("/* This file was generated by gen_qfloat16_tables.cpp */\n\n");
fid.write("#include <QtCore/qfloat16.h>\n\n");
printf("QT_BEGIN_NAMESPACE\n\n");
printf("#if !defined(__F16C__) && !defined(__ARM_FP16_FORMAT_IEEE)\n\n");
fid.write("QT_BEGIN_NAMESPACE\n\n");
fid.write("#if !defined(__F16C__) && !defined(__ARM_FP16_FORMAT_IEEE)\n\n");
fid.write("const quint32 qfloat16::mantissatable[2048] = {\n");
fid.write("0,\n");
printf("const quint32 qfloat16::mantissatable[2048] = {\n");
printf("0,\n");
for (i = 1; i < 1024; i++)
fid.write(PRINTHEX(convertmantissa(i)));
printf("0x%XU,\n", convertmantissa(i));
for (i = 1024; i < 2048; i++)
fid.write(PRINTHEX(0x38000000U + ((i - 1024) << 13)));
fid.write("};\n\n");
printf("0x%XU,\n", 0x38000000U + ((i - 1024) << 13));
printf("};\n\n");
fid.write("const quint32 qfloat16::exponenttable[64] = {\n");
fid.write("0,\n");
printf("const quint32 qfloat16::exponenttable[64] = {\n");
printf("0,\n");
for (i = 1; i < 31; i++)
fid.write(PRINTHEX(i << 23));
fid.write("0x47800000U,\n"); // 31
fid.write("0x80000000U,\n"); // 32
printf("0x%XU,\n", i << 23);
printf("0x47800000U,\n"); // 31
printf("0x80000000U,\n"); // 32
for (i = 33; i < 63; i++)
fid.write(PRINTHEX(0x80000000U + ((i - 32) << 23)));
fid.write("0xC7800000U,\n"); // 63
fid.write("};\n\n");
printf("0x%XU,\n", 0x80000000U + ((i - 32) << 23));
printf("0xC7800000U,\n"); // 63
printf("};\n\n");
fid.write("const quint32 qfloat16::offsettable[64] = {\n");
fid.write("0,\n");
printf("const quint32 qfloat16::offsettable[64] = {\n");
printf("0,\n");
for (i = 1; i < 32; i++)
fid.write("1024U,\n");
fid.write("0,\n");
printf("1024U,\n");
printf("0,\n");
for (i = 33; i < 64; i++)
fid.write("1024U,\n");
fid.write("};\n\n");
printf("1024U,\n");
printf("};\n\n");
qint32 e;
int32_t e;
for (i = 0; i < 256; ++i) {
e = i - 127;
if (e < -24) { // Very small numbers map to zero
@ -144,20 +133,19 @@ qint32 main(qint32 argc, char **argv)
}
}
fid.write("const quint32 qfloat16::basetable[512] = {\n");
printf("const quint32 qfloat16::basetable[512] = {\n");
for (i = 0; i < 512; i++)
fid.write(PRINTHEX(basetable[i]));
printf("0x%XU,\n", basetable[i]);
fid.write("};\n\n");
printf("};\n\n");
fid.write("const quint32 qfloat16::shifttable[512] = {\n");
printf("const quint32 qfloat16::shifttable[512] = {\n");
for (i = 0; i < 512; i++)
fid.write(PRINTHEX(shifttable[i]));
printf("0x%XU,\n", shifttable[i]);
fid.write("};\n\n");
printf("};\n\n");
fid.write("#endif // !__F16C__ && !__ARM_FP16_FORMAT_IEEE\n\n");
fid.write("QT_END_NAMESPACE\n");
fid.close();
printf("#endif // !__F16C__ && !__ARM_FP16_FORMAT_IEEE\n\n");
printf("QT_END_NAMESPACE\n");
return 0;
}

2
src/tools/qfloat16-tables/qfloat16-tables.pro
View File

@ -1,6 +1,6 @@
option(host_build)
CONFIG += force_bootstrap
CONFIG -= qt
SOURCES += gen_qfloat16_tables.cpp
load(qt_tool)