[llvm] [AArch64] Removed redundant FMOV instruction for truncstores of f64/f32 via bitcast to i64/i32/i8. (PR #149997)

[Amina Chabane via llvm-commits]

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@@ -4706,6 +4706,30 @@ let Predicates = [IsLE] in {
             (STRQui FPR128:$Rt, GPR64sp:$Rn, uimm12s16:$offset)>;
 }
 
+// truncstorei32 of f64 bitcasted to i64
+def : Pat<(truncstorei32 (i64 (bitconvert (f64 FPR64:$Rt))), (am_indexed32 GPR64sp:$Rn, uimm12s4:$offset)),
+          (STRSui (EXTRACT_SUBREG FPR64:$Rt, ssub), GPR64sp:$Rn, uimm12s4:$offset)>;
+
+// truncstorei16 of f64 bitcasted to i64
+def : Pat<(truncstorei16 (i64 (bitconvert (f64 FPR64:$Rt))), (am_indexed16 GPR64sp:$Rn, uimm12s2:$offset)),
+          (STRHui (f16 (EXTRACT_SUBREG FPR64:$Rt, hsub)), GPR64sp:$Rn, uimm12s2:$offset)>;      
+
+let Predicates = [HasFullFP16] in {
+  // truncstorei16 of f32 bitcasted to i32
+  def : Pat<(truncstorei16 (i32 (bitconvert (f32 FPR32:$Rt))), (am_indexed16 GPR64sp:$Rn, uimm12s2:$off)),
+          (STRHui (f16 (EXTRACT_SUBREG FPR32:$Rt, hsub)), GPR64sp:$Rn, uimm12s2:$off)>;
+}
+
+let Predicates = [HasFPARMv8] in {
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Amichaxx wrote:

Guards have been removed.

https://github.com/llvm/llvm-project/pull/149997