BrzVlad

Total executed opcodes 305590200
11% Opcounts 34261110, calls 81900, Method System.Text.Json.JsonWriterHelper:ToUtf8 (System.ReadOnlySpan`1<byte>,System.Span`1<byte>,int&,int&), imethod ptr 0x55f2d503d870
22% Opcounts 33980080, calls 849502, Method System.Text.ASCIIUtility:WidenFourAsciiBytesToUtf16AndWriteToBuffer (char&,uint), imethod ptr 0x55f2d4d9ce08
29% Opcounts 23040810, calls 81900, Method System.Text.Encodings.Web.DefaultJavaScriptEncoderBasicLatin:FindFirstCharacterToEncode (char*,int), imethod ptr 0x55f2d5038218
36% Opcounts 20590344, calls 1715862, Method System.ReadOnlySpan`1<byte>:.ctor (void*,int), imethod ptr 0x55f2d4d3fee0
43% Opcounts 19605240, calls 1633770, Method System.Text.Encodings.Web.DefaultJavaScriptEncoderBasicLatin:NeedsEscaping (char), imethod ptr 0x55f2d503cc20
49% Opcounts 19539627, calls 13, Method System.Text.ASCIIUtility:WidenAsciiToUtf16 (byte*,char*,uintptr), imethod ptr 0x55f2d4d9cd38
54% Opcounts 16052400, calls 327600, Method System.Memory`1<byte>:get_Span (), imethod p

BrzVlad

v8 - execution time 5.9s
- switch dispatch
                  -- B4 start (loop up to 16) --
0x11917e11c721    a1  48895588       REX.W movq [rbp-0x78],rdx
0x11917e11c725    a5  488b5623       REX.W movq rdx,[rsi+0x23]
0x11917e11c729    a9  48895dd8       REX.W movq [rbp-0x28],rbx
0x11917e11c72d    ad  48897dd0       REX.W movq [rbp-0x30],rdi
0x11917e11c731    b1  4c8945c8       REX.W movq [rbp-0x38],r8
0x11917e11c735    b5  4c894dc0       REX.W movq [rbp-0x40],r9
0x11917e11c739    b9  4c895db8       REX.W movq [rbp-0x48],r11

BrzVlad

v8
  - switch dispatch
0x255a37a8b314   534  4889bd38ffffff REX.W movq [rbp-0xc8],rdi
0x255a37a8b31b   53b  488b7e23       REX.W movq rdi,[rsi+0x23]
0x255a37a8b31f   53f  4c8965d0       REX.W movq [rbp-0x30],r12
0x255a37a8b323   543  48899d48ffffff REX.W movq [rbp-0xb8],rbx
0x255a37a8b32a   54a  48895588       REX.W movq [rbp-0x78],rdx
0x255a37a8b32e   54e  483b27         REX.W cmpq rsp,[rdi]
0x255a37a8b331   551  0f86ce1a0100   jna 0x255a37a9ce05  <+0x12025>
0x255a37a8b337   557  4489e7         movl rdi,r12

BrzVlad

gcc:
  - switch dispatch
  1398f0:       41 0f b7 55 00          movzwl 0x0(%r13),%edx
  1398ff:       66 81 fa ab 02          cmp    $0x2ab,%dx
  139904:       0f 87 34 94 00 00       ja     142d3e <interp_exec_method+0x96ae>
  13990a:       48 8d 35 27 25 21 00    lea    0x212527(%rip),%rsi        # 34be38 <__func__.31203+0x1508>
  139911:       0f b7 c2                movzwl %dx,%eax
  139914:       48 63 04 86             movslq (%rsi,%rax,4),%rax
  139918:       48 01 f0                add    %rsi,%rax
  13991b:       ff e0                   jmpq   *%rax

BrzVlad

using System;
using System.Linq;
using System.Numerics;
using System.Runtime.InteropServices;
using System.Diagnostics;

class Program {
    static void Main () {
        const int iterations = Benchmark.IterationCount, 
            warming_iterations = Benchmark.WarmingIterationCount;

BrzVlad

PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.

Stack dump:

0.	Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang++ -g -o ./output.s -S -target wasm32 -fcolor-diagnostics -fno-crash-diagnostics -O2 <source> 

1.	<eof> parser at end of file

2.	Code generation

BrzVlad

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

typedef int            gint;
typedef unsigned int   guint;
typedef short          gint16;
typedef unsigned short guint16;
typedef long           glong;

BrzVlad

// Global variable
#define mono_break() variable = 0x6666

volatile int variable;

// interp_exec_method_switch
case MINT_LDARGFLD_I8: {
                mono_break ();
                gpointer *o = frame->stack_args [ip [1]].data.p;
                if (!o)

BrzVlad

// Simple testcase for verifying basic GC functionality
// (allocation, collection, root scanning, object scanning, write barriers)
using System;
using System.Collections.Generic;

public class Program {
	public string s;

	public static List<Program> list = new List<Program> ();

BrzVlad

diff --git a/mono/utils/mono-threads-coop.c b/mono/utils/mono-threads-coop.c
index 28bf12c..dacaa1d 100644
--- a/mono/utils/mono-threads-coop.c
+++ b/mono/utils/mono-threads-coop.c
@@ -314,12 +314,15 @@ mono_threads_enter_gc_safe_region_unbalanced (gpointer *stackpointer)
        return mono_threads_enter_gc_safe_region_unbalanced_internal (&stackdata);
 }
 
-static MONO_NO_OPTIMIZATION gpointer
+static gpointer