1 %verify "branch taken" 2 %verify "branch not taken" 3 /* 4 * Generic one-operand compare-and-branch operation. Provide a "revcmp" 5 * fragment that specifies the *reverse* comparison to perform, e.g. 6 * for "if-le" you would use "gt". 7 * 8 * for: if-eqz, if-nez, if-ltz, if-gez, if-gtz, if-lez 9 */ 10 /* if-cmp vAA, +BBBB */ 11 mov r0, rINST, lsr #8 @ r0<- AA 12 GET_VREG(r2, r0) @ r2<- vAA 13 mov r9, #4 @ r0<- BYTE branch dist for not-taken 14 cmp r2, #0 @ compare (vA, 0) 15 b${revcmp} 1f @ branch to 1 if comparison failed 16 FETCH_S(r9, 1) @ r9<- branch offset, in code units 17 movs r9, r9, asl #1 @ convert to bytes, check sign 18 bmi common_backwardBranch @ backward branch, do periodic checks 19 1: 20 #if defined(WITH_JIT) 21 GET_JIT_PROF_TABLE(r0) 22 FETCH_ADVANCE_INST_RB(r9) @ update rPC, load rINST 23 cmp r0,#0 24 bne common_updateProfile 25 GET_INST_OPCODE(ip) @ extract opcode from rINST 26 GOTO_OPCODE(ip) @ jump to next instruction 27 #else 28 FETCH_ADVANCE_INST_RB(r9) @ update rPC, load rINST 29 GET_INST_OPCODE(ip) @ extract opcode from rINST 30 GOTO_OPCODE(ip) @ jump to next instruction 31 #endif 32
