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LLVM lacks host-independent folding for floating-point library routines #8565

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sunfishcode opened this issue Sep 20, 2010 · 2 comments
Open

LLVM lacks host-independent folding for floating-point library routines #8565

sunfishcode opened this issue Sep 20, 2010 · 2 comments
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bugzilla Issues migrated from bugzilla floating-point Floating-point math

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@sunfishcode
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Bugzilla Link 8193
Version trunk
OS All
CC @majnemer

Extended Description

LLVM does constant folding for library routines such as sin, cos, etc. using the host libm. This means its results can vary across hosts, and it means that optimization (which could lead to a particular call being folded, or not) can affect program behavior.
@llvmbot
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llvmbot commented Sep 21, 2010

I think this is what gcc uses MPFR for.

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llvmbot commented May 17, 2013

The constant folding is in llvm::ConstantFoldCall in lib/Analysis/ConstantFolding.cpp.

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
@arsenm arsenm added the floating-point Floating-point math label Aug 16, 2023
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bugzilla Issues migrated from bugzilla floating-point Floating-point math
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