diff options
Diffstat (limited to 'vm/mterp/x86/OP_USHR_LONG.S')
| -rw-r--r-- | vm/mterp/x86/OP_USHR_LONG.S | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/vm/mterp/x86/OP_USHR_LONG.S b/vm/mterp/x86/OP_USHR_LONG.S new file mode 100644 index 0000000..4f3647e --- /dev/null +++ b/vm/mterp/x86/OP_USHR_LONG.S @@ -0,0 +1,32 @@ +%verify "executed" + /* + * Long integer shift. This is different from the generic 32/64-bit + * binary operations because vAA/vBB are 64-bit but vCC (the shift + * distance) is 32-bit. Also, Dalvik requires us to mask off the low + * 6 bits of the shift distance. x86 shifts automatically mask off + * the low 5 bits of %cl, so have to handle the 64 > shiftcount > 31 + * case specially. + */ + /* shr-long vAA, vBB, vCC */ + /* ecx gets shift count */ + /* Need to spill rIBASE */ + /* rINSTw gets AA */ + movzbl 2(rPC),%eax # eax<- BB + movzbl 3(rPC),%ecx # ecx<- CC + SPILL(rIBASE) + GET_VREG_WORD rIBASE %eax 1 # rIBASE<- v[BB+1] + GET_VREG_R %ecx %ecx # ecx<- vCC + GET_VREG_WORD %eax %eax 0 # eax<- v[BB+0] + shrdl rIBASE,%eax + shrl %cl,rIBASE + testb $$32,%cl + je 2f + movl rIBASE,%eax + xorl rIBASE,rIBASE +2: + SET_VREG_WORD rIBASE rINST 1 # v[AA+1]<- rIBASE + FETCH_INST_OPCODE 2 %ecx + UNSPILL(rIBASE) + SET_VREG_WORD %eax rINST 0 # v[BB+0]<- eax + ADVANCE_PC 2 + GOTO_NEXT_R %ecx |