Extended Description

Constant folding for 'frem' seems flaky for certain values. For example, "frem float 0.1, 1.0" returns -0.9 when constant folded:

define float @​test1() {
entry:
%y = frem float 0x3FB99999A0000000, 1.0
ret float %y
}

@​x = global float 0x3FB99999A0000000 ; float 0.1

define float @​test2() {
%x = load float* @​x
%y = frem float %x, 1.0
ret float %y
}