https://sourceware.org/bugzilla/show_bug.cgi?id=27519
Bug ID: 27519
Summary: GNU AS does not support SUBSPL syntax
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: caij2003 at gmail dot com
Target Milestone: ---
According to "ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition",
the subtraction instruction of registers has the following syntax:
SUB{S}{<c>}{<q>} {<Rd>,} <Rn>, <Rm> {, <shift>}
However, GNU AS does not support such syntax:
$ cat foo.s
subspl r3, r3, r8
$ arm-linux-gnueabihf-as foo.s -o gcc.o
foo.s: Assembler messages:
foo.s:2: Error: bad instruction `subspl r3,r3,r8'
In the above code, PL is is one of possible condition codes for <c> in the SUB
instruction. However, GAS supports a slightly different syntax:
$ cat bar.s
subpls r3, r3, r8
$ arm-linux-gnueabihf-as bar.s -o gcc.o
$ arm-linux-gnueabihf-objdump -d gcc.o
gcc.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <.text>:
0: 50533008 subspl r3, r3, r8
Note objdump prints subspl instead of subpls. Clang only supports the official
syntax, so code written with the GNU syntax would not be compatible with Clang.
Links:
https://developer.arm.com/documentation/ddi0406/cd
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