[llvm-bugs] [Bug 31175] [AArch64] unnecessary cmp instruction with subtract and conditional select

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31175

Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Sanjay Patel <spatel+llvm at rotateright.com> ---
Should be fixed after:
https://reviews.llvm.org/rL289738

This solves the only problem I've seen when trying to canonicalize the min/max
IR pattern:
define i32 @max(i32 %x, i32 %y) {
  %sub = sub nsw i32 %x, %y
  %cmp = icmp sgt i32 %x, %y
  %sel = select i1 %cmp, i32 %sub, i32 0
  ret i32 %sel
}

to:
define i32 @max(i32 %x, i32 %y) {
  %sub = sub nsw i32 %x, %y
  %cmp = icmp sgt i32 %sub, 0
  %sel = select i1 %cmp, i32 %sub, i32 0
  ret i32 %sel
}

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