https://bugs.llvm.org/show_bug.cgi?id=51396
Bug ID: 51396
Summary: __divdf3 returns zero with some extreme values
Product: compiler-rt
Version: 11.0
Hardware: Other
OS: other
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
I've found that __divdf3 returns an incorrect result for a specific input.
Specifically:
a = 1.7112092293746032e-193 (raw bits: 0x17E8FBBB7CBDC600)
b = 8.858903059828881e+116 (raw bits: 0x58367bbed68d8223)
result = __divdf3(a, b)
I've found that the output is 0, while all hardware implementations I've tested
this code with return a non-zero value: 1.9316265431712e-310 (raw bits:
0x0000238ee05c879e). Therefore, I think this is a bug in __divdf3.
In practice, this issue causes the math package in Go to fail the tests when
compiled with TinyGo and when using the compiler-rt library on a baremetal
system.
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