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[avr-libc-dev] [bug #37778] _MemoryBarrier() in cpufunc.h error on compi
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From: |
Georg-Johann Lay |
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Subject: |
[avr-libc-dev] [bug #37778] _MemoryBarrier() in cpufunc.h error on compile |
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Date: |
Sun, 27 Jan 2013 17:28:18 +0000 |
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User-agent: |
Opera/9.80 (Windows NT 5.0; U; de) Presto/2.6.30 Version/10.63 |
Follow-up Comment #3, bug #37778 (project avr-libc):
Question is whether or not NOP should be allowed to be moved across
ordinary memory moves.
For SEI and CLI, for example, I think this is not wanted in general.
NOP is less intrusive than SEI / CLI, of course, but avr-gcc emits
__builtin_avr_nop() with a memory clobber:
http://gcc.gnu.org/viewcvs/trunk/gcc/config/avr/avr.md?revision=195151&view=markup#l5938
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