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[SR-11396] enabling optimization on linux changes the value of sinh #53797

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marcrasi mannequin opened this issue Aug 30, 2019 · 5 comments
Open

[SR-11396] enabling optimization on linux changes the value of sinh #53797

marcrasi mannequin opened this issue Aug 30, 2019 · 5 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself optimized only Flag: An issue whose reproduction requires optimized compilation standard library Area: Standard library umbrella

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@marcrasi
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marcrasi mannequin commented Aug 30, 2019

Previous ID SR-11396
Radar None
Original Reporter @marcrasi
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler, Standard Library
Labels Bug, OptimizedOnly
Assignee None
Priority Medium

md5: da5e338ccba0b59f99144cdbf8db658e

Issue Description:

marcrasi@marcrasi:~/Downloads/swift-toolchains/swift-5.0.2-RELEASE-ubuntu18.04$ cat marc.swift
import Glibc
print(sinh(Float(0.375)))
marcrasi@marcrasi:~/Downloads/swift-toolchains/swift-5.0.2-RELEASE-ubuntu18.04$ usr/bin/swift marc.swift
0.38385105
marcrasi@marcrasi:~/Downloads/swift-toolchains/swift-5.0.2-RELEASE-ubuntu18.04$ usr/bin/swift -O marc.swift
0.38385108

As you can see from the path, this is happening on swift-5.0.2-RELEASE-ubuntu18.04.

We have experimented with a few additional configurations:

  • (MacOS) Swift version 5.1-dev (LLVM 200186e28b, Swift aa4fd59) (x86_64-apple-darwin18.7.0): Issue does not occur. ("import Darwin" instead of "import Glibc")

  • (Linux) Swift version 5.1-dev (LLVM b47beb8a70, Swift e90298c) (x86_64-unknown-linux-gnu): Issue does occur.
@belkadan
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@stephentyrone, any hypotheses?

@belkadan
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Note the "only on the 5.0 branch" part.

@marcrasi
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marcrasi mannequin commented Aug 30, 2019

Not "only on the 5.0 branch," it happens on 5.1 on Linux too. It's only MacOS that's not doing this.

@stephentyrone
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I believe that this is compile-time evaluation vs. run-time, which suggests that different implementations of `sinh` are being invoked without being in a cross-compile situation. How does the swift build on linux link against libm?

@belkadan
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Oops, I mentally inserted a "not" where there wasn't one, my bad.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself optimized only Flag: An issue whose reproduction requires optimized compilation standard library Area: Standard library umbrella
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