1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdio.h> 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownlong long int arg = 0; 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownlong long int res = 0; 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownextern void loop_plain ( void ); 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownasm("\n" 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".text\n" 10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".globl loop_plain\n" 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"loop_plain:\n" 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpushq %rcx\n" 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq $999, %rax\n" 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq arg, %rcx\n" 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".Lmn123plain:\n" 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tloop .Lmn123plain\n" 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq %rax, res\n" 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpopq %rcx\n" 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tret\n" 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown); 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownextern void loop_ne ( void ); 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownasm("\n" 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".text\n" 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".globl loop_ne\n" 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"loop_ne:\n" 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpushq %rcx\n" 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq $999, %rax\n" 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq arg, %rcx\n" 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".Lmn123ne:\n" 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tloopne .Lmn123ne\n" 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq %rax, res\n" 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpopq %rcx\n" 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tret\n" 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown); 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownextern void loop_e ( void ); 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownasm("\n" 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".text\n" 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".globl loop_e\n" 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"loop_e:\n" 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpushq %rcx\n" 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq $999, %rax\n" 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq arg, %rcx\n" 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown".Lmn123e:\n" 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tdecq %rax\n" 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* invert the Z flag */ 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpushfq\n" 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\txorq $64, 0(%rsp)\n" 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpopfq\n" 64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tloope .Lmn123e\n" 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tmovq %rax, res\n" 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tpopq %rcx\n" 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown"\tret\n" 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown); 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint main ( void ) 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = 0; arg = 10; loop_plain(); printf("res = %lld\n", res); 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = 0; arg = 10; loop_ne(); printf("res = %lld\n", res); 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = 0; arg = 500; loop_ne(); printf("res = %lld\n", res); 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = 0; arg = 10; loop_e(); printf("res = %lld\n", res); 79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = 0; arg = 500; loop_e(); printf("res = %lld\n", res); 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return 0; 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 83