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On Tue, Jul 9, 2013 at 9:01 PM, Zach Devito <zdevito at gmail.com> wrote: > I'm seeing a difference in how LLVM 3.3 and 3.2 emit unaligned vector loads > on AVX. > 3.3 is splitting up an unaligned vector load but in 3.2, it was emitted as a > single instruction (details below). > In a matrix-matrix inner-kernel, I see a ~25% decrease in performance, which > seems to be

I'm seeing a difference in how LLVM 3.3 and 3.2 emit unaligned vector loads on AVX. 3.3 is splitting up an unaligned vector load but in 3.2, it was emitted as a single instruction (details below). In a matrix-matrix inner-kernel, I see a ~25% decrease in performance, which seems to be due to this. Any ideas why this changed? Thanks! Zach LLVM Code: define <4 x double> @vstore(<4 x

...with two instructions is > supposed to be faster. See r172868/r172894. > > Adding Nadav in case he has anything more to say. > > -Eli -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130709/c745e7fb/attachment.html>