diff options
Diffstat (limited to 'vm/mterp/armv5te/bincmp.S')
| -rw-r--r-- | vm/mterp/armv5te/bincmp.S | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/vm/mterp/armv5te/bincmp.S b/vm/mterp/armv5te/bincmp.S new file mode 100644 index 0000000..58f9079 --- /dev/null +++ b/vm/mterp/armv5te/bincmp.S @@ -0,0 +1,31 @@ +%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 |