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