https://bugs.llvm.org/show_bug.cgi?id=32177
Bug ID: 32177
Summary: Bug in APFloat::mod
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Core LLVM classes
Assignee: unassignedb...@nondot.org
Reporter: san...@playingwithpointers.com
CC: llvm-bugs@lists.llvm.org
Running @test_a through -instcombine folds %val to 0.0, while at runtime
executing @test_b returns a non-zero value 185438208.000000. I suspect this is
a bug in APFloat::mod (though I do not speak floating point well enough to be
sure):
define float @test_a() {
entry:
%val = frem float 0x43cbfcd960000000, 0xc1e2b34a00000000
ret float %val
}
define float @helper(float %x, float %y) {
%val = frem float %x, %y
ret float %val
}
define external float @test_b() {
%val = call float @helper(float 0x43cbfcd960000000, float 0xc1e2b34a00000000)
ret float %val
}
Notably, IEEEFloat::mod says: "This is not currently correct in all cases".
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