1 // Copyright 2015, ARM Limited 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are met: 6 // 7 // * Redistributions of source code must retain the above copyright notice, 8 // this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above copyright notice, 10 // this list of conditions and the following disclaimer in the documentation 11 // and/or other materials provided with the distribution. 12 // * Neither the name of ARM Limited nor the names of its contributors may be 13 // used to endorse or promote products derived from this software without 14 // specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND 17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 27 #include "vixl/a64/macro-assembler-a64.h" 28 #include "vixl/a64/instructions-a64.h" 29 #include "vixl/globals.h" 30 31 using namespace vixl; 32 33 static const int kDefaultIterationsCount = 100000; 34 35 // This program focuses on the emission of branches and veneers. 36 int main(int argc, char* argv[]) { 37 int iterations = 0; 38 39 switch (argc) { 40 case 1: iterations = kDefaultIterationsCount; break; 41 case 2: iterations = atoi(argv[1]); break; 42 default: 43 printf("Usage: %s [#iterations]\n", argv[0]); 44 exit(1); 45 } 46 47 size_t base_buf_size = iterations * 4 * kInstructionSize; 48 MacroAssembler masm(base_buf_size); 49 50 #define __ masm. 51 52 Label target_1, target_2, target_3, target_4; 53 for (int i = 0; i < iterations; i++) { 54 __ B(&target_1); 55 } 56 __ Bind(&target_1); 57 for (int i = 0; i < iterations; i++) { 58 __ B(eq, &target_2); 59 } 60 __ Bind(&target_2); 61 for (int i = 0; i < iterations; i++) { 62 __ Cbz(x2, &target_3); 63 } 64 __ Bind(&target_3); 65 for (int i = 0; i < iterations; i++) { 66 __ Tbz(x3, 2, &target_4); 67 } 68 __ Bind(&target_4); 69 70 masm.FinalizeCode(); 71 72 return 0; 73 } 74
