Getting unknown mnemonic error for aarch64

[dextran52]

Hello,

While compiling ortools for aarch64 i am getting below assembler error:

/tmp/ccgHyQUs.s: Assembler messages:
/tmp/ccgHyQUs.s:1478: Error: unknown mnemonic `addq' -- `addq x2,x0'
/tmp/ccgHyQUs.s:1479: Error: unknown mnemonic `cmovoq' -- `cmovoq x1,x0'

This may be because aarch64 does not support apple like syntax. But what can i do to resolve this error i don't know. Is there any hack available? and if i need to change code than where to change?
Please help!
error_ortools.txt

[Mizux]

I guess the problem come from this line:

or-tools/ortools/util/saturated_arithmetic.h

Lines 108 to 116 in 98e9b4e

	#if defined(__GNUC__) && defined(ARCH_K8)
	// TODO(user): port this to other architectures.
	inline int64 CapAddFast(int64 x, int64 y) {
	const int64 cap = CapWithSignOf(x);
	int64 result = x;
	// clang-format off
	asm volatile( // 'volatile': ask compiler optimizer "keep as is".
	"\t" "addq %[y],%[result]"
	"\n\t" "cmovoq %[cap],%[result]" // Conditional move if overflow.

and its use in

or-tools/ortools/util/saturated_arithmetic.h

Lines 125 to 130 in 98e9b4e

	inline int64 CapAdd(int64 x, int64 y) {
	#if defined(__GNUC__) && defined(ARCH_K8)
	return CapAddFast(x, y);
	#else
	return CapAddGeneric(x, y);
	#endif

Few things:

• You should modify base/integral_types.h so ARCH_K8 is not defined:
  

  or-tools/ortools/base/integral_types.h

  Lines 19 to 27 in 2c7a8bf

  	// Detect 64 bit.
  	#undef ARCH_K8
  	#if defined(_MSC_VER) && defined(_WIN64)
  	#define ARCH_K8
  	#elif defined(__APPLE__) && defined(__GNUC__)
  	#define ARCH_K8 // We only support 64 bit on Mac OS X.
  	#elif defined(__GNUC__) && defined(__LP64__) // Linux
  	#define ARCH_K8
  	#endif

// Detect 64 bit.
#undef ARCH_K8
#if defined(_MSC_VER) && defined(_WIN64)
#define ARCH_K8
#elif defined(__APPLE__) && defined(__GNUC__)
#define ARCH_K8  // We only support 64 bit on Mac OS X.
#elif defined(__GNUC__) && defined(__LP64__) && !defined(__aarch64__) // Linux
#define ARCH_K8
#endif

• You should modify the source code to support __aarch64__ like in

  or-tools/ortools/constraint_solver/constraint_solveri.h

  Line 253 in 9487eb8

  #if defined(ARCH_K8) || defined(__powerpc64__) || defined(__aarch64__)

  when needed (that's why I said currently OR-Tools does not support ARM architecture)

note: You can also try https://github.com/google/snappy/blob/master/snappy-stubs-internal.h#L70

[dextran52]

It worked Thank you very much!!