* CRIS atomics revisited 0/4: summary
@ 2012-07-16 3:40 Hans-Peter Nilsson
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From: Hans-Peter Nilsson @ 2012-07-16 3:40 UTC (permalink / raw)
To: gcc-patches
These were spotted while debugging usage of atomics within
glibc. The kind of changes are microoptimizations,
nanooptimizations, a buglet and a major issue. Micro: the
load-store-conditional sequence for compare-and-swap I
originally committed was an earlier version improved later.
Nanooptimizations: choosing better-fitting operands for the
atomic operator insn. Buglet: a post-increment could have
sneaked into the (non-atomic) arithmetic operator operand;
better make it nonmemory_operand altogether. I also threw in
use of the now generic need_atomic_barrier_p, let's call that a
microoptimization. The major issue, giving up on alignment of
atomic data by default, is last. Tested together and some
separately, no regressions for cris-elf nor crisv32-elf.
Committed separately.
brgds, H-P
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2012-07-16 3:40 CRIS atomics revisited 0/4: summary Hans-Peter Nilsson
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