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Failure to optimize 128-bit division #51510

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GabrielRavier opened this issue Oct 13, 2021 · 0 comments

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bugzilla

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GabrielRavier commented Oct 13, 2021


Bugzilla Link	52168
Version	trunk
OS	Linux
CC	@ecnelises,@RKSimon

Extended Description

__int128 b(__int128 j)
{
return j / 5;
}

This can be inlined into a series of operations avoiding the division, but LLVM just outputs a call to __divti3. GCC does this optimization.

llvmbot transferred this issue from llvm/llvm-bugzilla-archive

NCGThompson mentioned this issue

Add new intrinsic is_constant and optimize pow rust-lang/rust#114390

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