%verify "branch taken" %verify "branch not taken" /* * Generic two-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-eq, if-ne, if-lt, if-ge, if-gt, if-le */ /* if-cmp vA, vB, +CCCC */ mov r0, rINST, lsr #8 @ r0<- A+ mov r1, rINST, lsr #12 @ r1<- B and r0, r0, #15 GET_VREG(r3, r1) @ r3<- vB GET_VREG(r2, r0) @ r2<- vA mov r9, #4 @ r0<- BYTE branch dist for not-taken cmp r2, r3 @ compare (vA, vB) b${revcmp} 1f @ branch to 1 if comparison failed FETCH_S(r9, 1) @ r9<- branch offset, in code units movs r9, r9, asl #1 @ convert to bytes, check sign bmi common_backwardBranch @ yes, do periodic checks 1: #if defined(WITH_JIT) GET_JIT_PROF_TABLE(r0) FETCH_ADVANCE_INST_RB(r9) @ update rPC, load rINST b common_testUpdateProfile #else FETCH_ADVANCE_INST_RB(r9) @ update rPC, load rINST GET_INST_OPCODE(ip) @ extract opcode from rINST GOTO_OPCODE(ip) @ jump to next instruction #endif