nested enum_switch: msvc error

readme.txt

m2.cpp -- nested magic_enum::enum_switch() in do_process3

clang output (m2.s) -- 16 calls to templated process_convert()

msvc output (m2.asm) -- only 4 calls to templated process_convert(), first type always ChannelType_Invalid (remove all lines except do_process3 body)

m2.asm

; Function compile flags: /Ogtpy
;	COMDAT ?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z
_TEXT	SEGMENT
ct1$ = 8
ct2$ = 16
d1$ = 24
d2$ = 32
count$ = 40
?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z PROC	; do_process3, COMDAT
; File C:\K13\Work\ChkME\m2.cpp
; Line 37
	mov	rax, r8
; File C:\K13\Work\Akvis\Kernel\magic_enum.hpp
; Line 879
	cmp	ecx, -4
	je	SHORT $LN1557@do_process
	cmp	ecx, -3
	je	SHORT $LN1557@do_process
	cmp	ecx, -2
	je	SHORT $LN1557@do_process
	cmp	ecx, -1
	jne	SHORT $LN300@do_process
$LN1557@do_process:
; File C:\K13\Work\ChkME\m2.cpp
; Line 56
	cmp	edx, -4
	je	SHORT $LN1577@do_process
	cmp	edx, -3
	je	SHORT $LN1578@do_process
	cmp	edx, -2
	je	SHORT $LN1579@do_process
	cmp	edx, -1
	jne	SHORT $LN300@do_process
	mov	r8, QWORD PTR count$[rsp]
	mov	rdx, r9
	mov	rcx, rax
	jmp	??$process_convert@$$BY0A@EE@@YAXPEAY0A@$$CBEPEAE_K@Z ; process_convert<unsigned char [0],unsigned char>
$LN1579@do_process:
	mov	r8, QWORD PTR count$[rsp]
	mov	rdx, r9
	mov	rcx, rax
	jmp	??$process_convert@$$BY0A@EG@@YAXPEAY0A@$$CBEPEAG_K@Z ; process_convert<unsigned char [0],unsigned short>
$LN1578@do_process:
	mov	r8, QWORD PTR count$[rsp]
	mov	rdx, r9
	mov	rcx, rax
	jmp	??$process_convert@$$BY0A@EM@@YAXPEAY0A@$$CBEPEAM_K@Z ; process_convert<unsigned char [0],float>
$LN1577@do_process:
	mov	r8, QWORD PTR count$[rsp]
	mov	rdx, r9
	mov	rcx, rax
	jmp	??$process_convert@$$BY0A@EN@@YAXPEAY0A@$$CBEPEAN_K@Z ; process_convert<unsigned char [0],double>
$LN300@do_process:
	ret	0
?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z ENDP	; do_process3
_TEXT	ENDS

m2.cpp

#include "magic_enum.hpp"

enum ChannelType {
    ChannelType_Invalid =  0,
    ChannelType_8bit    = -1,
    ChannelType_16bit   = -2,
    ChannelType_Float   = -3,
    ChannelType_Double  = -4
};

template <>
struct magic_enum::customize::enum_range<ChannelType> {
  static constexpr int min = -4;
  static constexpr int max = 128;
};


using Type_8bit   = std::uint8_t;
using Type_16bit  = std::uint16_t;
using Type_Float  = float;
using Type_Double = double;

template< int channelType > struct TypeOfChannel { using Type = unsigned char[channelType]; };

template<> struct TypeOfChannel< ChannelType_8bit   > { using Type = Type_8bit;   };
template<> struct TypeOfChannel< ChannelType_16bit  > { using Type = Type_16bit;  };
template<> struct TypeOfChannel< ChannelType_Float  > { using Type = Type_Float;  };
template<> struct TypeOfChannel< ChannelType_Double > { using Type = Type_Double; };

template< int channelType >
using TypeOfChannel_t = typename TypeOfChannel<channelType>::Type;

template< typename TSrc, typename TDst >
void process_convert( const TSrc *d1, TDst *d2, size_t count );

void do_process3( ChannelType ct1, ChannelType ct2, const void *d1, void *d2, size_t count )
{
	magic_enum::enum_switch([ct2,d1,d2,count](auto val1){
		constexpr ChannelType cht_1 = val1;
		if ( cht_1 != ChannelType_Invalid )
		{
			using Type1 = typename TypeOfChannel<(int)cht_1>::Type;
			magic_enum::enum_switch([d1,d2,count](auto val2){
				constexpr ChannelType cht_2 = val2;
				if ( cht_2 != ChannelType_Invalid )
				{
					using Type2 = typename TypeOfChannel<(int)cht_2>::Type;
					process_convert<Type1,Type2>( static_cast<const Type1*>(d1), static_cast<Type2*>(d2), count );
				}
			}, ct2 );
		}
		else
		{
		}
	}, ct1 );
}

m2.s

	.text
	.def	@feat.00;
	.scl	3;
	.type	0;
	.endef
	.globl	@feat.00
.set @feat.00, 0
	.file	"m2.cpp"
	.def	"?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z";
	.scl	2;
	.type	32;
	.endef
	.globl	"?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z" # -- Begin function ?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z
	.p2align	4, 0x90
"?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z": # @"?do_process3@@YAXW4ChannelType@@0PEBXPEAX_K@Z"
# %bb.0:
                                        # kill: def $edx killed $edx def $rdx
                                        # kill: def $ecx killed $ecx def $rcx
	addl	$4, %ecx
	cmpl	$3, %ecx
	ja	.LBB0_26
# %bb.1:
	movq	%r8, %r10
	movq	40(%rsp), %r8
	leaq	.LJTI0_0(%rip), %rax
	movslq	(%rax,%rcx,4), %rcx
	addq	%rax, %rcx
	jmpq	*%rcx
.LBB0_2:
	addl	$4, %edx
	cmpl	$3, %edx
	ja	.LBB0_26
# %bb.3:
	leaq	.LJTI0_4(%rip), %rax
	movslq	(%rax,%rdx,4), %rcx
	addq	%rax, %rcx
	jmpq	*%rcx
.LBB0_4:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@NN@@YAXPEBNPEAN_K@Z" # TAILCALL
.LBB0_8:
	addl	$4, %edx
	cmpl	$3, %edx
	ja	.LBB0_26
# %bb.9:
	leaq	.LJTI0_3(%rip), %rax
	movslq	(%rax,%rdx,4), %rcx
	addq	%rax, %rcx
	jmpq	*%rcx
.LBB0_10:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@MN@@YAXPEBMPEAN_K@Z" # TAILCALL
.LBB0_14:
	addl	$4, %edx
	cmpl	$3, %edx
	ja	.LBB0_26
# %bb.15:
	leaq	.LJTI0_2(%rip), %rax
	movslq	(%rax,%rdx,4), %rcx
	addq	%rax, %rcx
	jmpq	*%rcx
.LBB0_16:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@GN@@YAXPEBGPEAN_K@Z" # TAILCALL
.LBB0_20:
	addl	$4, %edx
	cmpl	$3, %edx
	ja	.LBB0_26
# %bb.21:
	leaq	.LJTI0_1(%rip), %rax
	movslq	(%rax,%rdx,4), %rcx
	addq	%rax, %rcx
	jmpq	*%rcx
.LBB0_22:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@EN@@YAXPEBEPEAN_K@Z" # TAILCALL
.LBB0_26:
	retq
.LBB0_5:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@NM@@YAXPEBNPEAM_K@Z" # TAILCALL
.LBB0_6:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@NG@@YAXPEBNPEAG_K@Z" # TAILCALL
.LBB0_7:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@NE@@YAXPEBNPEAE_K@Z" # TAILCALL
.LBB0_11:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@MM@@YAXPEBMPEAM_K@Z" # TAILCALL
.LBB0_12:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@MG@@YAXPEBMPEAG_K@Z" # TAILCALL
.LBB0_13:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@ME@@YAXPEBMPEAE_K@Z" # TAILCALL
.LBB0_17:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@GM@@YAXPEBGPEAM_K@Z" # TAILCALL
.LBB0_18:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@GG@@YAXPEBGPEAG_K@Z" # TAILCALL
.LBB0_19:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@GE@@YAXPEBGPEAE_K@Z" # TAILCALL
.LBB0_23:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@EM@@YAXPEBEPEAM_K@Z" # TAILCALL
.LBB0_24:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@EG@@YAXPEBEPEAG_K@Z" # TAILCALL
.LBB0_25:
	movq	%r10, %rcx
	movq	%r9, %rdx
	jmp	"??$process_convert@EE@@YAXPEBEPEAE_K@Z" # TAILCALL
	.p2align	2, 0x90
.LJTI0_0:
	.long	.LBB0_2-.LJTI0_0
	.long	.LBB0_8-.LJTI0_0
	.long	.LBB0_14-.LJTI0_0
	.long	.LBB0_20-.LJTI0_0
.LJTI0_1:
	.long	.LBB0_22-.LJTI0_1
	.long	.LBB0_23-.LJTI0_1
	.long	.LBB0_24-.LJTI0_1
	.long	.LBB0_25-.LJTI0_1
.LJTI0_2:
	.long	.LBB0_16-.LJTI0_2
	.long	.LBB0_17-.LJTI0_2
	.long	.LBB0_18-.LJTI0_2
	.long	.LBB0_19-.LJTI0_2
.LJTI0_3:
	.long	.LBB0_10-.LJTI0_3
	.long	.LBB0_11-.LJTI0_3
	.long	.LBB0_12-.LJTI0_3
	.long	.LBB0_13-.LJTI0_3
.LJTI0_4:
	.long	.LBB0_4-.LJTI0_4
	.long	.LBB0_5-.LJTI0_4
	.long	.LBB0_6-.LJTI0_4
	.long	.LBB0_7-.LJTI0_4
                                        # -- End function
	.section	.drectve,"yn"
	.ascii	" /FAILIFMISMATCH:\"_MSC_VER=1900\""
	.ascii	" /FAILIFMISMATCH:\"_ITERATOR_DEBUG_LEVEL=0\""
	.ascii	" /FAILIFMISMATCH:\"RuntimeLibrary=MT_StaticRelease\""
	.ascii	" /DEFAULTLIB:libcpmt.lib"
	.ascii	" /FAILIFMISMATCH:\"_CRT_STDIO_ISO_WIDE_SPECIFIERS=0\""
	.addrsig