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I've just stumbled across this and I'm a bit puzzled. I have an out-of-the-box VS 2010 F# project, with all default settings, targeting .NET 4.0. The F# code is like this: let test(a:int, b:int, c:int) = min a (min b c) When I compile it for release, the generated IL contains some strange NOP instructions scattered around. Like this: The generated IL for this (with all default settings): .method public static int32 test(int32 a, int32 b, int32 c) cil managed { // Code size 20 (0x14) .maxstack 4 .locals init ([0] int32 V_0) // HERE IL_0000: nop IL_0001: ldarg.1 IL_0002: ldarg.2 IL_0003: bge.s IL_0009 IL_0005: ldarg.1 // HERE IL_0006: nop IL_0007: br.s IL_000b IL_0009: ldarg.2 // HERE IL_000a: nop IL_000b: stloc.0 IL_000c: ldarg.0 IL_000d: ldloc.0 IL_000e: bge.s IL_0012 IL_0010: ldarg.0 IL_0011: ret IL_0012: ldloc.0 IL_0013: ret } // end of method Module1::test My .fsproj project configuration is: <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <Tailcalls>true</Tailcalls> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <WarningLevel>3</WarningLevel> <DocumentationFile>bin\Release\TestFsIL.XML</DocumentationFile> </PropertyGroup> Now, if I comment out line <DebugType>pdbonly</DebugType> , the NOP instructions disappear. But of course so does the PDB file! .method public static int32 test(int32 a, int32 b,

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