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2019 Apr 15
2
Loop Strength Reduction Pass Does Not Work for Some Varialbles Related to Induction Variables
Dear all,
Hi! Recently, I try to combine the passes SeparateConstOffsetFromGEP and LoopStrengthReduction to transform the multiplication in the lowered GEP IRs into addition.
However, it seems LoopStrengthReduction is unable to remove all the multiplications for the element offset calculation.
My test code is shown below and thanks a lot in advance for your time and suggestion!
2019 Apr 15
2
Loop Strength Reduction Pass Does Not Work for Some Varialbles Related to Induction Variables
...ariables
收件人: Tingyuan LIANG
抄送: llvm-dev at lists.llvm.org
From a quick glance at the code, it looks like both inner loops were unrolled at least once (vary by architecture)
and have the expected number of multiplications, four and two (if unrolled once), respectively.
https://gcc.godbolt.org/z/1ks4Pt
--
Momchil Velikov,
Senior Compiler Engineer
Arm
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