[llvm] [missed-opt][X86] Optimize fptosi+select down to a single cvttsd2si Instruction on X86 (PR #172710)

[via llvm-commits]

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@@ -1048,6 +1048,10 @@ template <typename Opnd> inline UnaryOpc_match<Opnd> m_Abs(const Opnd &Op) {
   return UnaryOpc_match<Opnd>(ISD::ABS, Op);
 }
 
+template <typename Opnd> inline UnaryOpc_match<Opnd> m_FAbs(const Opnd &Op) {
+  return UnaryOpc_match<Opnd>(ISD::FABS, Op);
+}
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Bhuvan1527 wrote:

Got it. I can take that as well. We already have code changes. I can add some tests. 
If you are okay with the same, Please assign that to me. 

https://github.com/llvm/llvm-project/pull/172710