https://llvm.org/bugs/show_bug.cgi?id=23158
Bug ID: 23158
Summary: sNAN is not handled correct on legacy X87.
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
When handling the float or double signaling NaN (sNAN) value with legacy X87 on
x86. If it loads signal NaN to the x87 FP, the sNAN will be changed into into
quiet NANs (qNAN). And Sometimes the value will be handled with normal regiter
because of optimzation. This will leads to difference result.
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