[llvm-commits] [PATCH][Review Please] Optimize ARM Position Independent Code Generation

[Yin Ma]

Hi Evan,

 

The attached pdf contains an example of this change. It can result

In code size reduction for most of PIC enabled programs.

 

Thanks,

 

                              Yin 

 

From: Evan Cheng [mailto:evan.cheng at apple.com] 
Sent: Tuesday, July 31, 2012 5:48 PM
To: Yin Ma
Cc: llvm-commits at cs.uiuc.edu
Subject: Re: [llvm-commits] [PATCH][Review Please] Optimize ARM Position
Independent Code Generation

 

Hi Yin,

 

Can you provide some assembly code so we can understand what you are trying
to do?

 

Thanks,

 

Evan

 

On Jul 30, 2012, at 10:55 AM, Yin Ma <yinma at codeaurora.org> wrote:





Hi

Currently LLVM ARM backend is still using the x86 way to generate position
independent code. The algorithm retrieves the pointer of global offset table
at first. However, GCC has been using the label relative offset to computer
position independent code. The GCC way results smaller code size in ARM
architecture. This patch is to implement GCC way to generate position
independent code.

In the attachment.
pic.diff is the code patch
the rest of four files are the test validation results before and after code
changed

Please give a review

 

Thanks,

 

                    Yin

<report.simple.new.txt><report.simple.org.txt><cross.new><cross.org><pic.dif
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