| /* |
| * 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 */ |
| lsr w1, wINST, #12 // w1<- B |
| ubfx w0, wINST, #8, #4 // w0<- A |
| GET_VREG w3, w1 // w3<- vB |
| GET_VREG w2, w0 // w2<- vA |
| FETCH_S w1, 1 // w1<- branch offset, in code units |
| mov w0, #2 // Offset if branch not taken |
| cmp w2, w3 // compare (vA, vB) |
| csel wINST, w1, w0, ${condition} // Branch if true, stashing result in callee save reg. |
| #if MTERP_PROFILE_BRANCHES |
| // TUINING: once measurements are complete, remove #if and hand-schedule. |
| EXPORT_PC |
| mov x0, xSELF |
| add x1, xFP, #OFF_FP_SHADOWFRAME |
| sbfm x2, xINST, 0, 31 // Sign extend branch offset |
| bl MterpProfileBranch // (self, shadow_frame, offset) |
| cbnz w0, MterpOnStackReplacement // Note: offset must be in xINST |
| #endif |
| ldr w7, [xSELF, #THREAD_FLAGS_OFFSET] |
| adds w2, wINST, wINST // convert to bytes, check sign |
| FETCH_ADVANCE_INST_RB w2 // update rPC, load wINST |
| b.mi MterpCheckSuspendAndContinue |
| GET_INST_OPCODE ip // extract opcode from wINST |
| GOTO_OPCODE ip // jump to next instruction |
