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290b4cb3a4
Add general support in the function parser for "integer functions" (actually implemented as special unary operators, then wrapped in macros) and implement a family of integer logarithms. The only difference is the behavior on a non-power-of-two argument: ilog2[e] -- throw an error ilog2w -- throw a warning ilog2f -- round down to power of 2 ilog2c -- round up to power of 2 This is useful for back-converting from masks to bit values. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
;; --------------------------------------------------------------------------
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;;
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;; Copyright 2012 The NASM Authors - All Rights Reserved
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;; See the file AUTHORS included with the NASM distribution for
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;; the specific copyright holders.
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;;
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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
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;; conditions are met:
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;;
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;; * Redistributions of source code must retain the above copyright
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;; notice, this list of conditions and the following disclaimer.
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;; * Redistributions in binary form must reproduce the above
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;; copyright notice, this list of conditions and the following
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;; disclaimer in the documentation and/or other materials provided
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;; with the distribution.
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;;
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;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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;; CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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;; INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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;; MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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;; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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;; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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;; 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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;; EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;;
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;; --------------------------------------------------------------------------
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;;
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;; ifunc.mac
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;;
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;; Integer function utility macros
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;;
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USE: ifunc
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%idefine ilog2(x) (__ilog2e__(x))
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%idefine ilog2e(x) (__ilog2e__(x))
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%idefine ilog2w(x) (__ilog2w__(x))
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%idefine ilog2f(x) (__ilog2f__(x))
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%idefine ilog2c(x) (__ilog2c__(x))
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