diff options
Diffstat (limited to 'vm/mterp/x86/OP_USHR_LONG.S')
| -rw-r--r-- | vm/mterp/x86/OP_USHR_LONG.S | 38 |
1 files changed, 38 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..5e4c89b --- /dev/null +++ b/vm/mterp/x86/OP_USHR_LONG.S @@ -0,0 +1,38 @@ +%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 edx */ + /* rINST gets AA */ + movzbl 2(rPC),%eax # eax<- BB + movzbl 3(rPC),%ecx # ecx<- CC + SPILL(rPC) # spill edx + GET_VREG_WORD(%edx,%eax,1) # edx<- v[BB+1] + GET_VREG (%ecx,%ecx) # ecx<- vCC + GET_VREG_WORD(%eax,%eax,0) # eax<- v[BB+0] + shrdl %edx,%eax + shrl %cl,%edx + testb $$32,%cl + je 2f + movl %edx,%eax + xorl %edx,%edx +2: + movzbl rINST_HI,%ecx + SET_VREG_WORD(%edx,%ecx,1) # v[BB+1]<- edx + UNSPILL(rPC) + jmp .L${opcode}_finish +%break + + +.L${opcode}_finish: + SET_VREG_WORD(%eax,%ecx,0) # v[BB+0]<- eax + FETCH_INST_WORD(2) + ADVANCE_PC(2) + GOTO_NEXT |