<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
h1
{mso-style-priority:9;
mso-style-link:"Heading 1 Char";
margin-top:24.0pt;
margin-right:0cm;
margin-bottom:0cm;
margin-left:0cm;
margin-bottom:.0001pt;
page-break-after:avoid;
font-size:14.0pt;
font-family:"Cambria","serif";
color:#365F91;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.Heading1Char
{mso-style-name:"Heading 1 Char";
mso-style-priority:9;
mso-style-link:"Heading 1";
font-family:"Cambria","serif";
color:#365F91;
font-weight:bold;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>This patch generates DWARF stack frame information for ARM/Thumb function prologues.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Due to the complexities of how the ARM function prologue generated, much of the generation of the DWARF CFI instructions are delayed until the adjustments to the Stack Pointer and Frame Pointer have calculated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>One issue that I am still investigating is why the insertion of the DWARF CFI instruction affected test CodeGen:ARM:interrupt-attr.ll requiring a change in the order of the code (although the new order is still valid code)from<o:p></o:p></p><p class=MsoNormal> mv r4, sp<o:p></o:p></p><p class=MsoNormal> add r7, sp, #20<o:p></o:p></p><p class=MsoNormal>to<o:p></o:p></p><p class=MsoNormal> add r7, sp, #20<o:p></o:p></p><p class=MsoNormal> mv r4, sp<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Keith<o:p></o:p></p></div></body></html>