From b79014f3eeeb64ff5dc6dc861c79cd888d1758fd Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf.pld@gmail.com>
Date: Thu, 3 Jun 2021 00:20:50 +0200
Subject: [PATCH] Optimize parsing numbers.

Don't read byte-by-byte, process data in 8-byte packets.
---
 client/TracySysTrace.cpp | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/client/TracySysTrace.cpp b/client/TracySysTrace.cpp
index f1c73f08..77a48d15 100644
--- a/client/TracySysTrace.cpp
+++ b/client/TracySysTrace.cpp
@@ -1200,16 +1200,24 @@ static uint64_t ReadNumber( const char*& data )
 {
     auto ptr = data;
     assert( *ptr >= '0' && *ptr <= '9' );
-    uint64_t val = *ptr++ - '0';
+    uint64_t val = 0;
     for(;;)
     {
-        const uint8_t v = uint8_t( *ptr - '0' );
-        if( v > 9 ) break;
-        val = val * 10 + v;
-        ptr++;
+        uint64_t q;
+        memcpy( &q, ptr, 8 );
+        for( int i=0; i<8; i++ )
+        {
+            const uint64_t v = ( q & 0xFF ) - '0';
+            if( v > 9 )
+            {
+                data = ptr + i;
+                return val;
+            }
+            val = val * 10 + v;
+            q >>= 8;
+        }
+        ptr += 8;
     }
-    data = ptr;
-    return val;
 }
 
 static uint8_t ReadState( char state )
@@ -1473,7 +1481,8 @@ void SysTraceWorker( void* ptr )
 #else
 static void ProcessTraceLines( int fd )
 {
-    char* buf = (char*)tracy_malloc( 64*1024 );
+    // 8 bytes buffer space for wide unbound reads
+    char* buf = (char*)tracy_malloc( 64*1024 + 8 );
 
     struct pollfd pfd;
     pfd.fd = fd;