[LLVMdev] Floating point comparison doubt
clattner at apple.com
Mon Jun 22 16:53:53 PDT 2009
On Jun 22, 2009, at 3:56 AM, Sachin.Punyani at microchip.com wrote:
> In unordered floating point comparison before making a call for
> comparison proper one node called UO_F32 is generated. In targets
> this node is replaced with a call to __unordsf2.
> My doubts here
> 1) What are these UO_F32 and O_F32 nodes for?
> 2) What is this function (__unordsf2) supposed to do?
uo -> unordered, o -> ordered.
unordered(x,y) is true if either x or y is a NaN
ordered(x,y) is true if neither x or y is a nan.
See also the CondCode enum in llvm/include/llvm/CodeGen/
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