%verify "branch taken" %verify "branch not taken" /* * Generic one-operand compare-and-branch operation. Provide a "revcmp" * fragment that specifies the *reverse* comparison to perform, e.g. * for "if-le" you would use "gt". * * for: if-eqz, if-nez, if-ltz, if-gez, if-gtz, if-lez */ /* if-cmp vAA, +BBBB */ mov r0, rINST, lsr #8 @ r0<- AA GET_VREG(r2, r0) @ r2<- vAA FETCH_S(r1, 1) @ r1<- branch offset, in code units cmp r2, #0 @ compare (vA, 0) mov${revcmp} r1, #2 @ r1<- inst branch dist for not-taken adds r1, r1, r1 @ convert to bytes & set flags FETCH_ADVANCE_INST_RB(r1) @ update rPC, load rINST #if defined(WITH_JIT) ldr r0, [rSELF, #offThread_pJitProfTable] ldrmi rIBASE, [rSELF, #offThread_curHandlerTable] @ refresh table base cmp r0,#0 bne common_updateProfile @ test for JIT off at target #else ldrmi rIBASE, [rSELF, #offThread_curHandlerTable] @ refresh table base #endif GET_INST_OPCODE(ip) @ extract opcode from rINST GOTO_OPCODE(ip) @ jump to next instruction