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https://github.com/libretro/RetroArch
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43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*
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The MIT License (MIT)
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Copyright (c) 2015 Lachlan Tychsen-Smith (lachlan.ts@gmail.com)
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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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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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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 THE
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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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void
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enable_runfast()
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{
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#ifdef __arm__
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static const unsigned int x = 0x04086060;
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static const unsigned int y = 0x03000000;
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int r;
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asm volatile (
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"fmrx %0, fpscr \n\t" //r0 = FPSCR
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"and %0, %0, %1 \n\t" //r0 = r0 & 0x04086060
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"orr %0, %0, %2 \n\t" //r0 = r0 | 0x03000000
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"fmxr fpscr, %0 \n\t" //FPSCR = r0
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: "=r"(r)
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: "r"(x), "r"(y)
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);
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#endif
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}
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