https://llvm.org/bugs/show_bug.cgi?id=24859
Bug ID: 24859
Summary: Floating point constants are not deterministic across
platforms
Product: clang
Version: 3.7
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: e...@80386.nl
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 14896
--> https://llvm.org/bugs/attachment.cgi?id=14896&action=edit
Tarball with testcase and output
If I install exactly the same version of Clang (3.7.0-RELEASE) on Mac OS X,
FreeBSD and Linux, all targeting the same platform (x86_64-unknown-cloudabi)
and build the same source file at different optimization levels, I get
different results. This bug is similar in nature to bug 24734, but the root
cause is different. My suspicion is that this is related to FPU rounding modes.
Attached is a tarball that contains a C source file, foo.c, that is a reduced
testcase based on libspeex's vbr.c. This testcase has been built on Mac OS X,
FreeBSD and Linux, using different optimization modes. As you can see, anything
above -O0 yields different results.
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