//=======================================================================
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//=======================================================================
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// Project Monophony
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// Project Monophony
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// Wire-Frame 3D Graphics Accelerator IP Core
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// Wire-Frame 3D Graphics Accelerator IP Core
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//
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//
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// File:
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// File:
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// f22.c
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// f22.c
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//
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//
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// Abstract:
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// Abstract:
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// 22-bit floating point number utility
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// 22-bit floating point number utility
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//
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//
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// Author:
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// Author:
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// Kenji Ishimaru (kenji.ishimaru@prtissimo.com)
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// Kenji Ishimaru (info.wf3d@gmail.com)
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//
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//
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//======================================================================
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//======================================================================
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//
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//
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// Copyright (c) 2015, Kenji Ishimaru
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// Copyright (c) 2015, Kenji Ishimaru
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// All rights reserved.
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// All rights reserved.
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//
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//
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// Redistribution and use in source and binary forms, with or without
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// modification, are permitted provided that the following conditions are met:
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//
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//
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// -Redistributions of source code must retain the above copyright notice,
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// -Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// this list of conditions and the following disclaimer.
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// -Redistributions in binary form must reproduce the above copyright notice,
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// -Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// and/or other materials provided with the distribution.
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//
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//
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// Revision History
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// Revision History
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#include <stdio.h>
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#include <stdio.h>
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union {
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union {
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unsigned int ui;
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unsigned int ui;
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float f;
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float f;
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} uif;
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} uif;
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float cnv_f22_to_f32(unsigned int a) {
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float cnv_f22_to_f32(unsigned int a) {
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// extract sign
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// extract sign
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unsigned int tmp_s = (a >> 21) & 1;
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unsigned int tmp_s = (a >> 21) & 1;
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// extract exp
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// extract exp
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unsigned int tmp_e = (a >> 16) & 0x1f;
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unsigned int tmp_e = (a >> 16) & 0x1f;
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unsigned int tmp_oe = (a >> 16) & 0x1f;
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unsigned int tmp_oe = (a >> 16) & 0x1f;
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// extract fraction(with integer bit)
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// extract fraction(with integer bit)
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unsigned int tmp_m = a & 0xffff;
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unsigned int tmp_m = a & 0xffff;
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if ((tmp_oe != 0)||(tmp_m != 0)) {
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if ((tmp_oe != 0)||(tmp_m != 0)) {
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tmp_e -= 15;
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tmp_e -= 15;
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tmp_e += 127;
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tmp_e += 127;
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}
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}
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// denormal
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// denormal
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if ((tmp_oe == 0)&&(tmp_m != 0)) {
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if ((tmp_oe == 0)&&(tmp_m != 0)) {
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while (((tmp_m >> 15)&1) != 1) {
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while (((tmp_m >> 15)&1) != 1) {
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tmp_m = tmp_m << 1;
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tmp_m = tmp_m << 1;
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tmp_e--;
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tmp_e--;
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}
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}
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}
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}
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tmp_m = (tmp_m << 1) & 0xfff; // remove integer bit
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tmp_m = (tmp_m << 1) & 0xfff; // remove integer bit
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unsigned int t = (tmp_s << 31) | (tmp_e << 23) | (tmp_m << 7);
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unsigned int t = (tmp_s << 31) | (tmp_e << 23) | (tmp_m << 7);
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uif.ui = t;
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uif.ui = t;
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return uif.f;
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return uif.f;
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}
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}
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int main() {
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int main() {
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unsigned int x;
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unsigned int x;
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while (1) {
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while (1) {
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printf("f22 = ");
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printf("f22 = ");
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scanf("%x", &x);
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scanf("%x", &x);
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printf("float value = %f\n",cnv_f22_to_f32(x));
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printf("float value = %f\n",cnv_f22_to_f32(x));
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}
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}
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}
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}
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