1 /* Copyright (C) 2008 The Android Open Source Project 2 * 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 /* 17 * File: OP_SHR_LONG.S 18 * 19 * Code: Performs a shift right long 20 * 21 * For: shl-long 22 * 23 * Description: Perform a binary shift operation using two source registers 24 * where one is the shift amount and the other is the value to shift. 25 * Store the result in a destination register. 26 * 27 * Format: AA|op CC|BB (23x) 28 * 29 * Syntax: op vAA, vBB, vCC 30 */ 31 32 FETCH_BB 1, %edx # %edx<- BB 33 FETCH_CC 1, %eax # %eax<- CC 34 movq (rFP, %edx, 4), %xmm1 # %xmm1<- vBB 35 movss (rFP, %eax, 4), %xmm0 # %xmm0<- vCC 36 movq .LshiftMask, %xmm2 37 pand %xmm2, %xmm0 # %xmm0<- masked for the shift bits 38 psrlq %xmm0, %xmm1 # %xmm1<- shifted vBB 39 cmpl $$0, 4(rFP, %edx, 4) # check if we need to consider sign 40 jl .L${opcode}_finish # consider sign 41 jmp .L${opcode}_final # sign is fine, finish 42 %break 43 44 .L${opcode}_finish: 45 movq .Lvalue64, %xmm3 # %xmm3<- 64 46 psubq %xmm0, %xmm3 # %xmm3<- 64 - shift amount 47 movq .L64bits, %xmm4 # %xmm4<- lower 64 bits set 48 psllq %xmm3, %xmm4 # %xmm4<- correct mask for sign bits 49 por %xmm4, %xmm1 # %xmm1<- signed and shifted vBB 50 51 .L${opcode}_final: 52 movq %xmm1, (rFP, rINST, 4) # vAA<- shifted vBB 53 FINISH 2 # jump to next instruction 54
