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d2edcad66e
Thanks to Phil Zimmermann for the code and for the license exception we needed to include it. There remains some build system integration work to be done before this code will build properly in the FreeSWITCH tree.
63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/*
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* Copyright (c) 1995 Colin Plumb. All rights reserved.
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* For licensing and other legal details, see the file legal.c.
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*/
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#ifndef LBNPPC_H
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#define LBNPPC_H
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/*
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* Assembly-language routines for the Power PC processor.
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* Annoyingly, the Power PC does not have 64/32->32 bit divide,
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* so the C code should be reasonably fast. But it does have
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* 32x32->64-bit multiplies, and these routines provide access
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* to that.
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*
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* In versions of CodeWarrior before 8.0, there was no PPC assembler,
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* so a kludged-up one in CPP is used. This requires casting an
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* array of unsigneds to function pointer type, and a function pointer
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* is not a pointer to the code, but rather a pointer to a (code,TOC)
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* pointer pair which we fake up.
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*
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* CodeWarrior 8.0 supports PCC assembly, which is used directly.
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*/
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/*
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* Bignums are stored in arrays of 32-bit words, and the least
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* significant 32-bit word has the lowest address, thus "little-endian".
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* The C code is slightly more efficient this way, so unless the
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* processor cares (the PowerPC, like most RISCs, doesn't), it is
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* best to use BN_LITTLE_ENDIAN.
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* Note that this has NOTHING to do with the order of bytes within a 32-bit
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* word; the math library is insensitive to that.
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*/
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#define BN_LITTLE_ENDIAN 1
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typedef unsigned bnword32;
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#define BNWORD32 bnword32
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#if __MWERKS__ < 0x800
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/* Shared transition vector array */
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extern unsigned const * const lbnPPC_tv[];
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/* A function pointer on the PowerPC is a pointer to a transition vector */
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#define lbnMulN1_32 \
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((void (*)(bnword32 *, bnword32 const *, unsigned, bnword32))(lbnPPC_tv+0))
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#define lbnMulAdd1_32 \
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((bnword32 (*)(bnword32 *, bnword32 const *, unsigned, bnword32))(lbnPPC_tv+1))
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#define lbnMulSub1_32 \
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((bnword32 (*)(bnword32 *, bnword32 const *, unsigned, bnword32))(lbnPPC_tv+2))
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#else /* __MWERKS__ >= 0x800 */
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void lbnMulN1_32(bnword32 *, bnword32 const *, unsigned, bnword32);
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#define lbnMulN1_32 lbnMulN1_32
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bnword32 lbnMulAdd1_32(bnword32 *, bnword32 const *, unsigned, bnword32);
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#define lbnMulAdd1_32 lbnMulAdd1_32
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bnword32 lbnMulSub1_32(bnword32 *, bnword32 const *, unsigned, bnword32);
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#define lbnMulSub1_32 lbnMulSub1_32
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#endif /* __MWERKS__ >= 0x800 */
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#endif /* LBNPPC_H */
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