[i386] Use memory address constraints in __bswap_16s() and __bswap_64s()
Minimise code size by forcing the use of memory addresses for __bswap_16s() and __bswap_64s(). (__bswap_32s() cannot avoid loading the value into a register.) Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -19,7 +19,7 @@ __bswap_variable_16 ( uint16_t x ) {
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static inline __attribute__ (( always_inline )) void
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__bswap_16s ( uint16_t *x ) {
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__asm__ ( "rorw $8, %0" : "=g" ( *x ) : "0" ( *x ) );
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__asm__ ( "rorw $8, %0" : "+m" ( *x ) );
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}
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static inline __attribute__ (( always_inline, const )) uint32_t
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@ -63,9 +63,8 @@ __bswap_64s ( uint64_t *x ) {
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"xchgl %2,%1\n\t"
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"bswapl %2\n\t"
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"movl %2,%0\n\t"
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: "=g" ( dwords->low ), "=g" ( dwords->high ),
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"=r" ( discard )
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: "0" ( dwords->low ), "1" ( dwords->high ) );
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: "+m" ( dwords->low ), "+m" ( dwords->high ),
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"=r" ( discard ) );
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}
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#endif /* _BITS_BYTESWAP_H */
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