[dev] Enhanced arg.h from quark

From: Nikita Zlobin <nick87720z_AT_gmail.com>
Date: Tue, 6 Jul 2021 04:21:02 +0500

Check for double dash may be done in for loop.

arg.h: https://pastebin.com/c4FQcrtH

I tried to compare objdump'ed compiler output with different options -
filesizes are same, though difference exists.

There are diffs for 3 -O levels: -O3, -O2, -Os.

For -O3:

--- tabbed-O3-1.o.objdump 2021-07-05 21:13:23.601297273 +0500
+++ tabbed-O3-2.o.objdump 2021-07-05 21:13:57.461296518 +0500
_AT_@ -2327,10 +2327,10 @@
         cmpb $0x2d,(%rbx)
         jne <main+0x135>
         movzbl 0x1(%rbx),%eax
- test %al,%al
- je <main+0x135>
         cmp $0x2d,%al
         je <main+0xcd0>
+ test %al,%al
+ je <main+0x135>
         mov 0x0(%rip),%r11d # <main+0x84>
         add $0x1,%rbx
         xor %r9d,%r9d

For -O2: https://pastebin.com/4WR3L8dc
With -Os: https://pastebin.com/09LNut3R
tabbed.o with -O2: https://pastebin.com/yb0jCE6W
Received on Tue Jul 06 2021 - 01:21:02 CEST

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