* subword semantics
@ 2007-01-19 12:07 Joern Rennecke
2007-01-19 15:30 ` Dave Brolley
0 siblings, 1 reply; 2+ messages in thread
From: Joern Rennecke @ 2007-01-19 12:07 UTC (permalink / raw)
To: cgen
What are the actual semantics of subword?
The documentation says that it is endian dependent, but the existing
bi-endian ports always use word 0 to refer to the most significant part.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: subword semantics
2007-01-19 12:07 subword semantics Joern Rennecke
@ 2007-01-19 15:30 ` Dave Brolley
0 siblings, 0 replies; 2+ messages in thread
From: Dave Brolley @ 2007-01-19 15:30 UTC (permalink / raw)
To: Joern Rennecke; +Cc: cgen
Joern Rennecke wrote:
>What are the actual semantics of subword?
>The documentation says that it is endian dependent, but the existing
>bi-endian ports always use word 0 to refer to the most significant part.
>
>
You are correct. The semantics are not endian dependent. Similar to the
way shift operators are not endian dependent. The documentation also
says that dependence on endianness was to be revisited. Perhaps that's
what happend, or perhaps the intent was to recommend caution when using
a (mem ...) expression as the operand of (subword ...)
Dave
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