https://bugs.llvm.org/show_bug.cgi?id=49831
Bug ID: 49831
Summary: Missing FP optimization opportunities for fcmp ord
operations
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: juneyoung....@sf.snu.ac.kr
CC: llvm-bugs@lists.llvm.org
; Excerpted from llvm/test/Transforms/InstCombine/and-fcmp.ll
```
$ cat src.ll
define i1 @PR41069_commute_logical(i1 %z, float %c, float %d) {
%ord1 = fcmp ninf ord float %c, 0.0
%and = select i1 %ord1, i1 %z, i1 false
%ord2 = fcmp ninf reassoc ord float %d, 0.0
%r = select i1 %ord2, i1 %and, i1 false
ret i1 %r
}
```
This can be optimized to
```
%c.fr = freeze float %c
%ord1 = fcmp ord float %c.fr, %d
%r = select i1 %ord1, i1 %z, i1 false
```
Alive2 link: https://alive2.llvm.org/ce/z/QfkJak
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