[llvm-dev] Disable combining of loads and stores in instcombine
Neil Ryan via llvm-dev
llvm-dev at lists.llvm.org
Tue Apr 16 21:11:15 PDT 2019
I’m writing a pass for some custom hardware — we’d like to split arrays across hardware elements; this doesn’t work if consecutive writes to characters get combined to a word.
On Apr 16, 2019, 8:17 PM -0700, Tom Stellard <tstellar at redhat.com>, wrote:
> On 04/16/2019 11:38 AM, Neil Ryan via llvm-dev wrote:
> > LLVM's optimizer combines stores to consecutive characters into a write of a single word. For instance, if I have char A and I write some static value to each element, these writes would be combined into a single 32-bit word write. I found this thread <http://llvm.1065342.n5.nabble.com/disabling-combining-load-stores-in-optimizer-td37560.html> from 2009 -- it seems like it wasn't possible then. Has anything changed since?
> Why do you want to disable this optimization?
> > Neil
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