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pdp10-arith: add pdp10_sext_uint18()

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This commit is contained in:
Mikael Pettersson 2018-05-08 22:39:18 +02:00
parent 5e2ad04250
commit 54ea34d560
1 changed files with 9 additions and 1 deletions
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10
include/pdp10-arith.h
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@ -1,6 +1,6 @@
/*
* pdp10-arith.h -- arithmetic on PDP10 integer types
* Copyright (C) 2013-2015 Mikael Pettersson
* Copyright (C) 2013-2018 Mikael Pettersson
*
* This file is part of pdp10-tools.
*
@ -44,6 +44,14 @@ static inline pdp10_int36_t pdp10_sext_int36(pdp10_uint36_t x)
return ((x & PDP10_UINT36_MAX) ^ PDP10_UINT36_SBIT) - PDP10_UINT36_SBIT;
}
/* Sign-extend a pdp10_uint18_t to the full width of its representation type. */
static inline pdp10_uint18_t pdp10_sext_uint18(pdp10_uint18_t x)
{
const pdp10_uint18_t PDP10_UINT18_SBIT = ~(PDP10_UINT18_MAX >> 1) & PDP10_UINT18_MAX;
return ((x & PDP10_UINT18_MAX) ^ PDP10_UINT18_SBIT) - PDP10_UINT18_SBIT;
}
static inline pdp10_uint36_t pdp10_neg_int36(pdp10_uint36_t x)
{
return pdp10_zext_uint36(-pdp10_sext_int36(x));