Alex Zhitnitsky tkfx
tkfx
/ unrolledLoop.asm
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July 21, 2016 15:37
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| .... | |
| 0x00007fd715060743: vmovsd 0x10(%r8,%rcx,8),%xmm0 ;*daload | |
| ; - Opt::loopUnrolling@26 (line 179) | |
| 0x00007fd71506074a: vmovsd 0x10(%rbp),%xmm1 ;*daload | |
| ; - Opt::loopUnrolling@36 (line 179) | |
| 0x00007fd71506074f: vmulsd 0x10(%r12,%r9,8),%xmm1,%xmm1 | |
| 0x00007fd715060756: vaddsd %xmm0,%xmm1,%xmm0 ;*dadd | |
| ; - Opt::loopUnrolling@38 (line 179) | |
| 0x00007fd71506075a: vmovsd %xmm0,0x10(%r8,%rcx,8) ;*dastore | |
| ; - Opt::loopUnrolling@39 (line 179) |
tkfx
/ unrolledLoop.java
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July 21, 2016 15:37
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| private static double[] loopUnrolling2(double[][] matrix1, double[] vector1) { | |
| double[] result = new double[vector1.length]; | |
| for (int i = 0; i < matrix1.length; i++) { | |
| result[i] += matrix1[i][0] * vector1[0]; | |
| result[i] += matrix1[i][1] * vector1[1]; | |
| result[i] += matrix1[i][2] * vector1[2]; | |
| // and maybe it will expand even further - e.g. 4 iterations, thus | |
| // adding code to fix the indexing | |
| // which we would waste more time doing correctly and efficiently |
tkfx
/ rolledLoop.java
Last active
July 21, 2016 15:36
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| private static double[] loopUnrolling(double[][] matrix1, double[] vector1) { | |
| double[] result = new double[vector1.length]; | |
| for (int i = 0; i < matrix1.length; i++) { | |
| for (int j = 0; j < vector1.length; j++) { | |
| result[i] += matrix1[i][j] * vector1[j]; | |
| } | |
| } | |
| return result; |
tkfx
/ calcLine1.java
Last active
July 21, 2016 15:39
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| private static void calcLine(int a, int b, int from, int to) { | |
| Line l = new Line(a, b); | |
| for (int x = from; x <= to; x++) { | |
| int y = l.getY(x); | |
| System.err.println("(" + x + ", " + y + ")"); | |
| } | |
| } | |
| static class Line { | |
| public final int a; |
tkfx
/ calcLine2.Java
Last active
July 21, 2016 15:45
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| private static void calcLine(int a, int b, int from, int to) { | |
| Line l = new Line(a, b); | |
| for (int x = from; x <= to; x++) { | |
| int y = (l.a * x + l.b); | |
| System.err.println("(" + x + ", " + y + ")"); | |
| } | |
| } |
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| private static final ThreadLocal<Integer> counter = new ThreadLocal<Integer>(); | |
| private static void handleRequest() { | |
| if (counter.get() == null) { | |
| counter.set(0); | |
| } | |
| counter.set(counter.get() + 1); |
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| 0x00007fd71508b1ec: mov 0x1b0(%r15),%r10 ;*invokestatic currentThread | |
| ; - java.lang.ThreadLocal::get@0 (line 143) | |
| ; - Opt::handleRequest@3 (line 70) | |
| 0x00007fd71508b1f3: mov 0x50(%r10),%r11d ;*getfield threadLocals | |
| ; - java.lang.ThreadLocal::getMap@1 (line 213) | |
| ; - java.lang.ThreadLocal::get@6 (line 144) | |
| ; - Opt::handleRequest@3 (line 70) |
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| private static final ThreadLocal<Integer> counter = new ThreadLocal<Integer>() { | |
| @Override protected Integer initialValue() { | |
| return 0; | |
| } | |
| }; | |
| private static void handleRequest() { | |
| counter.set(counter.get() + 1); |
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| java.lang.NullPointerException: null | |
| at com.sparktale.bugtale.server.app.servlet.billing.GetUserBillingServlet.internalWork(GetUserBillingServlet.java:64) [GetUserBillingServlet.class:na] | |
| at com.sparktale.bugtale.server.app.servlet.billing.GetUserBillingServlet.internalWork(GetUserBillingServlet.java:27) [GetUserBillingServlet.class:na] | |
| at com.sparktale.bugtale.server.app.servlet.AppServicesProtoServlet.work(AppServicesProtoServlet.java:82) [AppServicesProtoServlet.class:na] | |
| at com.sparktale.bugtale.server.app.servlet.AppServicesProtoServlet.work(AppServicesProtoServlet.java:21) [AppServicesProtoServlet.class:na] | |
| at com.sparktale.bugtale.server.common.servlet.CommonServlet.handleRequest(CommonServlet.java:144) [CommonServlet.class:na] | |
| at com.sparktale.bugtale.server.common.servlet.CommonServlet.doPost(CommonServlet.java:64) [CommonServlet.class:na] | |
| at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) [servlet-api.jar:na] | |
| at javax.servl |
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| java.lang.NullPointerException: null | |
| at com.sparktale.bugtale.server.app.servlet.billing.GetUserBillingServlet.internalWork(GetUserBillingServlet.java:64) [GetUserBillingServlet.class:na] | |
| at com.sparktale.bugtale.server.app.servlet.billing.GetUserBillingServlet.internalWork(GetUserBillingServlet.java:27) [GetUserBillingServlet.class:na] | |
| at com.sparktale.bugtale.server.app.servlet.AppServicesProtoServlet.work(AppServicesProtoServlet.java:82) [AppServicesProtoServlet.class:na] | |
| at com.sparktale.bugtale.server.app.servlet.AppServicesProtoServlet.work(AppServicesProtoServlet.java:21) [AppServicesProtoServlet.class:na] | |
| at com.sparktale.bugtale.server.common.servlet.CommonServlet.handleRequest(CommonServlet.java:144) [CommonServlet.class:na] | |
| at com.sparktale.bugtale.server.common.servlet.CommonServlet.doPost(CommonServlet.java:64) [CommonServlet.class:na] |