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Allow command-line override of the BignumInt type.

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This makes it easy to re-test the mpint functions using different word
sizes and smoke out any more confusions between integer types in
mpint.c, by recompiling with -DBIGNUM_OVERRIDE=4 or =5 or =6 (for 16-,
32- or 64-bit respectively).

BIGNUM_OVERRIDE only lets you force the size downwards, not upwards:
of course the default behaviour is to use the largest BignumInt the
ifdefs can find a way to, and they can't magic up a bigger one just
because you tell them you'd like one.
This commit is contained in:
Simon Tatham 2019-01-07 07:25:45 +00:00
parent 48f4b0a36c
commit 55ea49de1e
1 changed files with 19 additions and 6 deletions
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25
mpint_i.h
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@ -57,7 +57,11 @@
* too.
*/
#if defined __SIZEOF_INT128__
/* You can lower the BignumInt size by defining BIGNUM_OVERRIDE on the
* command line to be your chosen max value of BIGNUM_INT_BITS_BITS */
#define BB_OK(b) (!defined BIGNUM_OVERRIDE || BIGNUM_OVERRIDE >= b)
#if defined __SIZEOF_INT128__ && BB_OK(6)
/*
* 64-bit BignumInt using gcc/clang style 128-bit BignumDblInt.
@ -72,7 +76,7 @@
#define BIGNUM_INT_BITS_BITS 6
#define DEFINE_BIGNUMDBLINT typedef __uint128_t BignumDblInt
#elif defined _MSC_VER && defined _M_AMD64
#elif defined _MSC_VER && defined _M_AMD64 && BB_OK(6)
/*
* 64-bit BignumInt, using Visual Studio x86-64 compiler intrinsics.
@ -119,7 +123,7 @@
(rh) = MULADD_hi; \
} while (0)
#elif defined __GNUC__ || defined _LLP64 || __STDC__ >= 199901L
#elif (defined __GNUC__ || defined _LLP64 || __STDC__ >= 199901L) && BB_OK(5)
/* 32-bit BignumInt, using C99 unsigned long long as BignumDblInt */
@ -127,7 +131,7 @@
#define BIGNUM_INT_BITS_BITS 5
#define DEFINE_BIGNUMDBLINT typedef unsigned long long BignumDblInt
#elif defined _MSC_VER && defined _M_IX86
#elif defined _MSC_VER && defined _M_IX86 && BB_OK(5)
/* 32-bit BignumInt, using Visual Studio __int64 as BignumDblInt */
@ -135,7 +139,7 @@
#define BIGNUM_INT_BITS_BITS 5
#define DEFINE_BIGNUMDBLINT typedef unsigned __int64 BignumDblInt
#elif defined _LP64
#elif defined _LP64 && BB_OK(5)
/*
* 32-bit BignumInt, using unsigned long itself as BignumDblInt.
@ -147,7 +151,7 @@
#define BIGNUM_INT_BITS_BITS 5
#define DEFINE_BIGNUMDBLINT typedef unsigned long BignumDblInt
#else
#elif BB_OK(4)
/*
* 16-bit BignumInt, using unsigned long as BignumDblInt.
@ -163,8 +167,17 @@
#define BIGNUM_INT_BITS_BITS 4
#define DEFINE_BIGNUMDBLINT typedef unsigned long BignumDblInt
#else
/* Should only get here if BB_OK(4) evaluated false, i.e. the
* command line defined BIGNUM_OVERRIDE to an absurdly small
* value. */
#error Must define BIGNUM_OVERRIDE to at least 4
#endif
#undef BB_OK
/*
* Common code across all branches of that ifdef: define all the
* easy constant macros in terms of BIGNUM_INT_BITS_BITS.