Re: [Xen-devel] [PATCH] arm32: fix build after 063188f4b3

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 10 Oct 2014, Jan Beulich wrote:
> >>> On 10.10.14 at 16:32, <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> > I would appreciate if Jan could post the assembly he is getting.
> 
> Here you go:
> 
>       .type   exynos_smc.constprop.1, %function
> exynos_smc.constprop.1:
> .LFB277:
>       .loc 1 40 0
>       .cfi_startproc
>       @ args = 0, pretend = 0, frame = 0
>       @ frame_needed = 0, uses_anonymous_args = 0
>       @ link register save eliminated.
> .LVL52:
>       .loc 1 43 0
>       mvn     r2, #3
>       mov     r3, #0

That cannot be right: ~3 ends up in r2, while r2 should be 0.
This doesn't look like an optimization: it looks like a bug.
Am I missing something?


> #APP
> @ 43 "exynos5.c" 1
>       .ifnc r2,r0 ; .err ; .endif
>       .ifnc r0,r1 ; .err ; .endif
>       .ifnc r3,r2 ; .err ; .endif
>       .ifnc r3,r3 ; .err ; .endif
>       smc #0
> @ 0 "" 2
>       .loc 1 51 0
>       bx      lr
>       .cfi_endproc
> .LFE277:
>       .size   exynos_smc.constprop.1, .-exynos_smc.constprop.1
> 
> with this call site code
> 
>       mov     r0, r6
>       bl      exynos_smc.constprop.1
> 
> Jan
> 

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