Hand scheduling ~300 instructions for Cortex-A9. Surely a compiler should be better at this than me. Nope. Not even close.
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@RichFelker I wrote the x86 asm for same algorithm a month back. Beat the compiler by 40% (primarily poor reg alloc / spilling). Depressing. -
@stephentyrone Radar or it didn't happen ;-) -
@OwenResistor oh, you're gonna love this one =) -
@OwenResistor <rdar://problem/8675309> implement perfect scheduler hero-mode for five-year old uarch so Steve stops complaining.
End of conversation
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@stephentyrone I remember writing lots of (good!) x86 asm for UTF-8 decoding in pre-musl libc, only to outdo it with C later.Thanks. Twitter will use this to make your timeline better. UndoUndo
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