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

[Thorsten Schütt via llvm-commits]

================
@@ -334,6 +337,59 @@ bool AMDGPUPostLegalizerCombinerImpl::matchRcpSqrtToRsq(
   return false;
 }
 
+bool AMDGPUPostLegalizerCombinerImpl::matchFDivSqrt(
+    MachineInstr &MI,
+    std::function<void(MachineIRBuilder &)> &MatchInfo) const {
+
----------------
tschuett wrote:

assert(MI.getOpode() == TargetOpcode::G_FDIV && "expected fdiv");

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