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r2960: during a lunchtime discussion I found out that all powerpc processors
can correctly (and quickly!) handle unaligned little endian memory
accesses, just like i386. This should reduce code size and speeds
things up quite a lot on ppc, at the expense of some inline asm code
(whcih means it only works with gcc)
(This used to be commit 2a0c427c2b
)
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@ -93,11 +93,45 @@ it also defines lots of intermediate macros, just ignore those :-)
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*/
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/*
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on powerpc we can use the magic instructions to load/store
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in little endian
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*/
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#if (defined(__powerpc__) && defined(__GNUC__))
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static __inline__ uint16_t ld_le16(const uint16_t *addr)
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{
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uint16_t val;
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__asm__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
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return val;
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}
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static __inline__ void st_le16(uint16_t *addr, const uint16_t val)
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{
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__asm__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
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}
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static __inline__ uint32_t ld_le32(const uint32_t *addr)
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{
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uint32_t val;
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__asm__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
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return val;
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}
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static __inline__ void st_le32(uint32_t *addr, const uint32_t val)
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{
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__asm__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
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}
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#define HAVE_ASM_BYTEORDER 1
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#endif
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#undef CAREFUL_ALIGNMENT
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/* we know that the 386 can handle misalignment and has the "right"
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byteorder */
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#ifdef __i386__
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#if defined(__i386__)
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#define CAREFUL_ALIGNMENT 0
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#endif
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@ -110,8 +144,19 @@ it also defines lots of intermediate macros, just ignore those :-)
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#define PVAL(buf,pos) (CVAL(buf,pos))
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#define SCVAL(buf,pos,val) (CVAL_NC(buf,pos) = (val))
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#if HAVE_ASM_BYTEORDER
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#if CAREFUL_ALIGNMENT
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#define _PTRPOS(buf,pos) (((const uint8_t *)buf)+(pos))
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#define SVAL(buf,pos) ld_le16((const uint16_t *)_PTRPOS(buf,pos))
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#define IVAL(buf,pos) ld_le32((const uint32_t *)_PTRPOS(buf,pos))
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#define SSVAL(buf,pos,val) st_le16((uint16_t *)__PTRPOS(buf,pos), val)
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#define SIVAL(buf,pos,val) st_le32((uint32_t *)__PTRPOS(buf,pos), val)
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#define SVALS(buf,pos) ((int16_t)SVAL(buf,pos))
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#define IVALS(buf,pos) ((int32_t)IVAL(buf,pos))
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#define SSVALS(buf,pos,val) SSVAL((buf),(pos),((int16_t)(val)))
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#define SIVALS(buf,pos,val) SIVAL((buf),(pos),((int32_t)(val)))
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#elif CAREFUL_ALIGNMENT
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#define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8)
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#define IVAL(buf,pos) (SVAL(buf,pos)|SVAL(buf,(pos)+2)<<16)
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