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/*
* Utility compute operations used by translated code.
*
* Copyright (c) 2007 Thiemo Seufer
* Copyright (c) 2007 Jocelyn Mayer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* Note that some of those functions may end up calling libgcc functions,
depending on the host machine. It is up to the target emulation to
cope with that. */
/* Binary search for leading zeros. */
static always_inline int clz32(uint32_t val)
{
int cnt = 0;
if (!(val & 0xFFFF0000U)) {
cnt += 16;
val <<= 16;
}
if (!(val & 0xFF000000U)) {
cnt += 8;
val <<= 8;
}
if (!(val & 0xF0000000U)) {
cnt += 4;
val <<= 4;
}
if (!(val & 0xC0000000U)) {
cnt += 2;
val <<= 2;
}
if (!(val & 0x80000000U)) {
cnt++;
val <<= 1;
}
if (!(val & 0x80000000U)) {
cnt++;
}
return cnt;
}
static always_inline int clo32(uint32_t val)
{
return clz32(~val);
}
static always_inline int clz64(uint64_t val)
{
int cnt = 0;
if (!(val & 0xFFFFFFFF00000000ULL)) {
cnt += 32;
val <<= 32;
}
if (!(val & 0xFFFF000000000000ULL)) {
cnt += 16;
val <<= 16;
}
if (!(val & 0xFF00000000000000ULL)) {
cnt += 8;
val <<= 8;
}
if (!(val & 0xF000000000000000ULL)) {
cnt += 4;
val <<= 4;
}
if (!(val & 0xC000000000000000ULL)) {
cnt += 2;
val <<= 2;
}
if (!(val & 0x8000000000000000ULL)) {
cnt++;
val <<= 1;
}
if (!(val & 0x8000000000000000ULL)) {
cnt++;
}
return cnt;
}
static always_inline int clo64(uint64_t val)
{
return clz64(~val);
}
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