[llvm] GlobalISel needs fdiv 1 / sqrt(x) to rsq combine (PR #78673)

[Nick Anderson via llvm-commits]

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@@ -33,12 +33,12 @@ def rcp_sqrt_to_rsq : GICombineRule<
          [{ return matchRcpSqrtToRsq(*${rcp}, ${matchinfo}); }]),
   (apply [{ Helper.applyBuildFn(*${rcp}, ${matchinfo}); }])>;
 
-def fdiv_by_sqrt_to_rsq : GICombineRule<
+def fdiv_by_sqrt_to_rsq_f16 : GICombineRule<
   (defs root:$root),
   (match (G_FSQRT $sqrt, $x, (MIFlags FmContract)),
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nickleus27 wrote:

So don't worry about f16 vectors? just f16:sqrt is okay?

https://github.com/llvm/llvm-project/pull/78673