> I'm trying to use _addcarryx_u64. GCC 7.1 is still generating ADD and > ADC instead of ADCX or ADOX: > ... > > Any ideas what I am doing wrong with respect to ADX? > > Thanks in advance > > **************************************** > > $ g++ -Wall -march=native test.cxx -c I probably should have mentioned... Adding flags like -O3, -O5 and -madx does not help. Below is the dump using -O3 -madx. Disassembly of section .text: 0000000000000000 <unsigned char Add<8u>(unsigned long*, unsigned long const*, unsigned long const*)>: 0: 48 8b 46 38 mov 0x38(%rsi),%rax 4: 48 03 42 38 add 0x38(%rdx),%rax 8: 0f 92 c1 setb %cl b: 48 89 47 38 mov %rax,0x38(%rdi) f: 48 8b 46 30 mov 0x30(%rsi),%rax 13: 80 c1 ff add $0xff,%cl 16: 48 13 42 30 adc 0x30(%rdx),%rax 1a: 0f 92 c1 setb %cl 1d: 48 89 47 30 mov %rax,0x30(%rdi) 21: 48 8b 46 28 mov 0x28(%rsi),%rax 25: 80 c1 ff add $0xff,%cl 28: 48 13 42 28 adc 0x28(%rdx),%rax 2c: 0f 92 c1 setb %cl 2f: 48 89 47 28 mov %rax,0x28(%rdi) 33: 48 8b 46 20 mov 0x20(%rsi),%rax 37: 80 c1 ff add $0xff,%cl 3a: 48 13 42 20 adc 0x20(%rdx),%rax 3e: 0f 92 c1 setb %cl 41: 48 89 47 20 mov %rax,0x20(%rdi) 45: 48 8b 46 18 mov 0x18(%rsi),%rax 49: 80 c1 ff add $0xff,%cl 4c: 48 13 42 18 adc 0x18(%rdx),%rax 50: 0f 92 c1 setb %cl 53: 48 89 47 18 mov %rax,0x18(%rdi) 57: 48 8b 46 10 mov 0x10(%rsi),%rax 5b: 80 c1 ff add $0xff,%cl 5e: 48 13 42 10 adc 0x10(%rdx),%rax 62: 0f 92 c1 setb %cl 65: 48 89 47 10 mov %rax,0x10(%rdi) 69: 48 8b 46 08 mov 0x8(%rsi),%rax 6d: 80 c1 ff add $0xff,%cl 70: 48 13 42 08 adc 0x8(%rdx),%rax 74: 48 89 47 08 mov %rax,0x8(%rdi) 78: 0f 92 c1 setb %cl 7b: 48 8b 06 mov (%rsi),%rax 7e: 48 8b 12 mov (%rdx),%rdx 81: 80 c1 ff add $0xff,%cl 84: 48 11 c2 adc %rax,%rdx 87: 0f 92 c0 setb %al 8a: 48 89 17 mov %rdx,(%rdi) 8d: c3 retq Jeff
