diff options
Diffstat (limited to 'vm/mterp/x86-atom/zcmp.S')
| -rw-r--r-- | vm/mterp/x86-atom/zcmp.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/vm/mterp/x86-atom/zcmp.S b/vm/mterp/x86-atom/zcmp.S new file mode 100644 index 0000000..6614dba --- /dev/null +++ b/vm/mterp/x86-atom/zcmp.S @@ -0,0 +1,53 @@ + /* Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + + /* + * File: zcmp.S + * + * Code: Generic 32-bit comparison operation. Provides a "revcmp" + * variable to specify the reverse comparison to perform + * + * For: if-eqz, if-gez, if-gtz, if-lez, if-ltz, if-nez + * + * Description: Branch to the given destination if the given register's + * value compares with 0 as specified. + * + * Format: AA|op BBBB (21t) + * + * Syntax: op vAA, +BBBB + */ + + cmp $$0, (rFP, rINST, 4) # compare vAA with zero + j${revcmp} ${opcode}_2f # goto next instruction or branch + FETCHs 1, %edx # %edx<- BBBB; branch offset + sal $$1, %edx # %edx<- adjust byte offset + + /* + * Inline common_backwardBranch + */ + + js common_periodicChecks_backwardBranch # jump on backwards branch +1: + FINISH_RB %edx, %ecx # jump to next instruction + + /* + * FINISH code + */ + +${opcode}_2f: + movzbl 4(rPC), %edx # grab the next opcode + movzbl 5(rPC), rINST # update the instruction + addl $$4, rPC # update the program counter + jmp *dvmAsmInstructionJmpTable(, %edx, 4) # jump to next instruction |