[llvm] [GlobalIsel] Speedup select to integer min/max (PR #92378)

[Jay Foad via llvm-commits]

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@@ -1307,6 +1307,13 @@ def select_to_minmax: GICombineRule<
          [{ return Helper.matchSimplifySelectToMinMax(*${root}, ${info}); }]),
   (apply [{ Helper.applyBuildFn(*${root}, ${info}); }])>;
 
+def select_to_iminmax: GICombineRule<
+  (defs root:$root, build_fn_matchinfo:$info),
+  (match (G_ICMP $tst, $tst1, $x, $y),
+         (G_SELECT $root, $tst, $x, $y),
+         [{ return Helper.matchSelectIMinMax(${root}, ${info}); }]),
+  (apply [{ Helper.applyBuildFnMO(${root}, ${info}); }])>;
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jayfoad wrote:

Now that we compile apply+match as a single C++ function we should check whether the buildfn here gets inlined. If not, maybe we need to rethink our use of applyBuildFn?

https://github.com/llvm/llvm-project/pull/92378