1 #include <stdint.h> 2 #include <stdio.h> 3 4 typedef struct { 5 uint64_t high; 6 uint64_t low; 7 } __attribute__((aligned(16))) quad_word; 8 9 10 /* CDSG needs quad-word alignment */ 11 quad_word _op1, _op2, _op3; 12 13 void 14 test(quad_word op1_init, quad_word op2_init, quad_word op3_init) 15 { 16 int cc; // unused 17 _op1 = op1_init; 18 _op2 = op2_init; 19 _op3 = op3_init; 20 21 __asm__ volatile ( 22 "lmg %%r0,%%r1,%1\n\t" 23 "lmg %%r2,%%r3,%3\n\t" 24 "cdsg %%r0,%%r2,%2\n\t" // cdsg 1st,3rd,2nd 25 "stmg %%r0,%%r1,%1\n" // store r0,r1 to op1 26 "stmg %%r2,%%r3,%3\n" // store r2,r3 to op3 27 : "=d"(cc), "+QS" (_op1), "+QS" (_op2), "+QS" (_op3) 28 : 29 : "r0", "r1", "r2", "r3", "cc"); 30 } 31 32 void op1_undefined(void) 33 { 34 quad_word op1, op2, op3; 35 36 // op1 undefined 37 op2.high = op2.low = 42; 38 op3.high = op3.low = 0xdeadbeefdeadbabeull; 39 test(op1, op2, op3); // complaint 40 } 41 42 void op2_undefined(void) 43 { 44 quad_word op1, op2, op3; 45 46 op1.high = op1.low = 42; 47 // op2 undefined 48 op3.high = op3.low = 0xdeadbeefdeadbabeull; 49 test(op1, op2, op3); // complaint 50 } 51 52 void op3_undefined(void) 53 { 54 quad_word op1, op2, op3; 55 56 op1.high = op1.low = 42; 57 op2 = op1; 58 // op3 undefined 59 test(op1, op2, op3); // no complaint; op3 is just copied around 60 } 61 62 int main () 63 { 64 op1_undefined(); 65 op2_undefined(); 66 op3_undefined(); 67 68 return 0; 69 } 70
