https://bugs.llvm.org/show_bug.cgi?id=40453
Bug ID: 40453
Summary: The compiler-rt leads to loss of floating precision
when GCC use compiler-rt instead of libgcc
Product: compiler-rt
Version: 7.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: compiler-rt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Hi all
Now we are try to use compiler-rt instead of libgcc when we use GCC to
compile program! but we find that comliper-rt will leads to loss of floating
precision, the following is detailed information:
The program:
int main()
{
double one = 1.0;
double tmp = 1.7976931348623157E308;
double ret = one / tmp;
printf(" ret : %E \n", ret);
}
1、GCC compiler program and use libgcc:
result:
ret : 5.562685E-309
2、GCC compiler program and use compiler-rt:
result:
ret : 0.000000E+00
If anyone know the reason why compiler-rt will leads to loss of floating
precision
, Please reply soon when you are convenient! I will appreciate it!
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