github-repos/tinycc
1
0
Fork 0
mirror of https://github.com/mirror/tinycc.git synced 2024-12-26 03:50:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

asmtest: avoid testing against complex nop alignment in gas

Browse Source 
.align #,0x90 in gas ignores the 0x90 and outputs any kind
of nop it feels like.  the one avoided by this patch is a 7
byte nop, which gas has been doing since at least 1999:
http://sourceware.org/ml/binutils/1999-10/msg00083.html

In order to match what gas does, we would need to make
code alignment target-specific, import a lot of code, and
face the question: exactly which gas {version,target,tune}
combo are we trying to match?  see i386_align_code in:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/config/tc-i386.c?annotate=1.460&cvsroot=src

The smart noppery is turned on via the special casing of 0x90
at line 438 in md_do_align in:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/config/tc-i386.h?annotate=1.1&cvsroot=src
This commit is contained in:
Joe Soroka 2011-01-23 16:46:24 -08:00
parent 2047f88334
commit 6839382480
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tests/asmtest.S
View File

@ -9,7 +9,8 @@
.int 1, 2, 3
.align 8
.byte 1
.align 16, 0x90
/* .align 16, 0x90 gas is too clever for us with 0x90 fill */
.align 16, 0x91 /* 0x91 tests the non-clever behaviour */
.skip 3
.skip 15, 0x90
.string "hello\0world"