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_2ADDR.S 18 * 19 * Code: Performs a shift left long 20 * 21 * For: shl-long/2addr 22 * 23 * Description: Perform a binary shift operation using two source registers 24 * where the fist is the value to shift and the second is the 25 * shift amount. Store the result in the first source register. 26 * 27 * Format: B|A|op (12x) 28 * 29 * Syntax: op vA, vB 30 */ 31 32 movl rINST, %edx # %edx<- BA 33 shr $$4, %edx # %edx<- B 34 andl $$15, rINST # rINST<- BA 35 movss (rFP, %edx, 4), %xmm0 # %xmm0<- vB 36 movq (rFP, rINST, 4), %xmm1 # %xmm1<- vA 37 movq .LshiftMask, %xmm2 38 pand %xmm2, %xmm0 # %xmm0<- masked for the shift bits 39 psrlq %xmm0, %xmm1 # %xmm1<- shifted vBB 40 cmpl $$0, 4(rFP, rINST, 4) # check if we need to consider sign 41 jl .L${opcode}_finish # consider sign 42 jmp .L${opcode}_final # sign is fine, finish 43 %break 44 45 .L${opcode}_finish: 46 movq .Lvalue64, %xmm3 # %xmm3<- 64 47 psubq %xmm0, %xmm3 # %xmm3<- 64 - shift amount 48 movq .L64bits, %xmm4 # %xmm4<- lower 64 bits set 49 psllq %xmm3, %xmm4 # %xmm4<- correct mask for sign bits 50 por %xmm4, %xmm1 # %xmm1<- signed and shifted vBB 51 52 .L${opcode}_final: 53 movq %xmm1, (rFP, rINST, 4) # vAA<- shifted vBB 54 FINISH 1 # jump to next instruction 55
