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Mark more assembly outputs as early clobber #1307

Merged
merged 3 commits into from May 12, 2023
Merged

Mark more assembly outputs as early clobber #1307

merged 3 commits into from May 12, 2023

Commits on May 12, 2023

  1. Bugfix: mark outputs as early clobber in scalar x86_64 asm 

    In the existing code, the compiler is allowed to allocate the RSI register
for outputs m0, m1, or m2, which are written to before the input in RSI is
read from. Fix this by marking them as early clobber.

Reported by ehoffman2 in bitcoin-core#766
    @sipa
    sipa committed May 12, 2023
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  2. Mark stack variables as early clobber for technical correctness 

    In the field 5x52 asm for x86_64, stack variables are provided as outputs.
The existing inputs are all forcibly allocated to registers, so cannot
coincide, but mark them as early clobber anyway to make this clearer.
    @sipa
    sipa committed May 12, 2023
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  3. Add release note

    @sipa
    sipa committed May 12, 2023
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