[llvm] [llubi] Implement fast-math flags for `uitofp`/`sitofp` (PR #222858)

[Nikita Popov via llvm-commits]

================
@@ -2488,6 +2488,12 @@ class InstExecutor : public InstVisitor<InstExecutor, void>,
       Res.convertFromAPInt(Operand.asInteger(), /*IsSigned=*/IsSigned,
                            Ctx.getCurrentRoundingMode());
 
+      if (I.hasNoInfs())
----------------
nikic wrote:

Missing check for infinity? This now always returns poison for ninf :)

https://github.com/llvm/llvm-project/pull/222858