Jeremy Brown wrote:
> On Mon, May 17, 2010 at 11:25 AM, Gilles Chanteperdrix
> <[email protected]> wrote:
>> Jeremy Brown wrote:
>>> {standard input}: Assembler messages:
>>> {standard input}:140: Error: selected processor does not support `rsc
>>> r7,r7,#0'
>>> {standard input}:159: Error: selected processor does not support `rsc
>>> r1,r1,#0'
>>> make: *** [libxenomai_la-timeconv.lo] Error 1
>> Ok. Could you try and compile the following piece of code with your
>> toolchain and show me the disassembly ?
>>
>> long long foo(long long x)
>> {
>> return -x;
>> }
>>
>> --
>> Gilles.
>
> Thanks for the quick reply! Here's the complete contents of foo.s:
>
> .syntax unified
> .arch armv7-a
> .eabi_attribute 27, 3
> .fpu vfpv3-d16
> .eabi_attribute 20, 1
> .eabi_attribute 21, 1
> .eabi_attribute 23, 3
> .eabi_attribute 24, 1
> .eabi_attribute 25, 1
> .eabi_attribute 26, 2
> .eabi_attribute 30, 6
> .eabi_attribute 18, 4
> .thumb
> .file "foo.c"
> .text
> .align 2
> .global foo
> .thumb
> .thumb_func
> .type foo, %function
> foo:
> @ args = 0, pretend = 0, frame = 8
> @ frame_needed = 1, uses_anonymous_args = 0
> @ link register save eliminated.
> push {r7}
> sub sp, sp, #12
> add r7, sp, #0
> strd r0, [r7]
> ldrd r0, [r7]
> negs r2, r0
> sbc r3, r1, r1, lsl #1
> mov r0, r2
> mov r1, r3
> add r7, r7, #12
> mov sp, r7
> pop {r7}
> bx lr
> .size foo, .-foo
> .ident "GCC: (Ubuntu 4.4.3-4ubuntu5) 4.4.3"
> .section .note.GNU-stack,"",%progbits
>
Compile with -O2 please
--
Gilles.
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