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Re: [Qemu-stable] [Qemu-devel] [PATCH v2 1/4] tcg/optimize: fix known-ze
From: |
Richard Henderson |
Subject: |
Re: [Qemu-stable] [Qemu-devel] [PATCH v2 1/4] tcg/optimize: fix known-zero bits for right shift ops |
Date: |
Sat, 07 Dec 2013 06:53:57 +1300 |
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Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 |
On 09/10/2013 05:27 AM, Aurelien Jarno wrote:
> 32-bit versions of sar and shr ops should not propagate known-zero bits
> from the unused 32 high bits. For sar it could even lead to wrong code
> being generated.
>
> Cc: Richard Henderson <address@hidden>
> Cc: Paolo Bonzini <address@hidden>
> Cc: address@hidden
> Signed-off-by: Aurelien Jarno <address@hidden>
> ---
> tcg/optimize.c | 21 +++++++++++++++++----
> 1 file changed, 17 insertions(+), 4 deletions(-)
Reviewed-by: Richard Henderson <address@hidden>
r~
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Richard Henderson <=