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 FETCH_S(r1, 1) @ r1<- branch offset, in code units 14 cmp r2, #0 @ compare (vA, 0) 15 mov${revcmp} r1, #2 @ r1<- inst branch dist for not-taken 16 adds r1, r1, r1 @ convert to bytes & set flags 17 FETCH_ADVANCE_INST_RB(r1) @ update rPC, load rINST 18 #if defined(WITH_JIT) 19 ldr r0, [rSELF, #offThread_pJitProfTable] 20 ldrmi rIBASE, [rSELF, #offThread_curHandlerTable] @ refresh table base 21 cmp r0,#0 22 bne common_updateProfile @ test for JIT off at target 23 #else 24 ldrmi rIBASE, [rSELF, #offThread_curHandlerTable] @ refresh table base 25 #endif 26 GET_INST_OPCODE(ip) @ extract opcode from rINST 27 GOTO_OPCODE(ip) @ jump to next instruction 28
