Allow lcl_var structs to be widened to primitive types on unix amd64. (#22437)

* Allow lcl_var structs to be widened to primitive types on unix amd64. The already happens on armarch

* Apply format patch

diff --git a/src/jit/morph.cpp b/src/jit/morph.cpp
index f83fdae..00a0e3a 100644 (file)
--- a/src/jit/morph.cpp
+++ b/src/jit/morph.cpp
@@ -2291,17 +2291,18 @@ void fgArgInfo::EvalArgsToTemps()
                     if (setupArg->OperIsCopyBlkOp())
                     {
                         setupArg = compiler->fgMorphCopyBlock(setupArg);
-#if defined(_TARGET_ARMARCH_)
-                        // This scalar LclVar widening step is only performed for ARM architectures.
+#if defined(_TARGET_ARMARCH_) || defined(UNIX_AMD64_ABI)
+                        // This scalar LclVar widening step is only performed for ARM and AMD64 unix.
                         //
                         CORINFO_CLASS_HANDLE clsHnd     = compiler->lvaGetStruct(tmpVarNum);
                         unsigned             structSize = varDsc->lvExactSize;
 
                         scalarType = compiler->getPrimitiveTypeForStruct(structSize, clsHnd, curArgTabEntry->isVararg);
-#endif // _TARGET_ARMARCH_
+#endif // _TARGET_ARMARCH_ || defined (UNIX_AMD64_ABI)
                     }
 
-                    // scalarType can be set to a wider type for ARM architectures: (3 => 4)  or (5,6,7 => 8)
+                    // scalarType can be set to a wider type for ARM or unix amd64 architectures: (3 => 4)  or (5,6,7 =>
+                    // 8)
                     if ((scalarType != TYP_UNKNOWN) && (scalarType != lclVarType))
                     {
                         // Create a GT_LCL_FLD using the wider type to go to the late argument list