https://bugs.llvm.org/show_bug.cgi?id=42047
Bug ID: 42047
Summary: -Ofast produces infinite loop
Product: new-bugs
Version: unspecified
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: p.rieb...@ucl.ac.uk
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 22031
--> https://bugs.llvm.org/attachment.cgi?id=22031&action=edit
Minimal file demonstrating optimiser bug ?
The attached program should list the powers of 3 less than 2^31 - 1
If compiled with 'cc -o oe oe.c' when run it works as expected however if
compiled with '-Ofast' added it seems as if the 'if ... break;' is ignored and
it enters an infinite loop.
Platform is Mojave 10.14.5, 2.5 GHz Intel Core i7 and cc version,
philip$ cc --version
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.6.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
philip$
I'm not a language lawyer so this may be allowed behaviour but thought I should
report it in case it isn't
Philip
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