<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=gb2312" http-equiv=Content-Type> <STYLE> BLOCKQUOTE { MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; MARGIN-LEFT: 2em } OL { MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px } UL { MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px } P { MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px } BODY { LINE-HEIGHT: 1.5; FONT-FAMILY: 微软雅黑; COLOR: #000000; FONT-SIZE: 10.5pt } </STYLE> <META name=GENERATOR content="MSHTML 8.00.7601.17514"></HEAD> <BODY style="MARGIN: 10px"> <DIV>Hi,</DIV> <DIV> </DIV> <DIV>My name is Sida Li and I am a senior student from Peking University in China. I am interested in the idea that improved application of GLSL complier optimizations.</DIV> <DIV> </DIV> <DIV>I have downloaded the source code and read some parts of the it. First let me talk about my understanding about the problem.</DIV> <DIV> </DIV> <DIV>The loop we try to improve should be in the main.cpp:</DIV> <DIV> </DIV> <DIV> <DIV style="FONT-FAMILY: Courier New"> do {</DIV> <DIV style="FONT-FAMILY: Courier New"> progress = do_common_optimization(shader->ir, false, false, 32);</DIV> <DIV style="FONT-FAMILY: Courier New"> } while (progress);</DIV> <DIV style="FONT-FAMILY: Courier New"> </DIV> <DIV style="FONT-FAMILY: 微软雅黑">In the function do_common_optimization, all optimization passes are called in a certain order. As the loop goes in a few times, some optimization passes do not contribute to optimizing the code since the original unoptimized code has been optimized and no more code that can be optimized by these optimization passes is generated by other optimization passes. So time spending on these optimization passes is wasted.</DIV> <DIV style="FONT-FAMILY: 微软雅黑"> </DIV> <DIV style="FONT-FAMILY: 微软雅黑">The goal is to f<SPAN style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; DISPLAY: inline !important; FONT: 10.5pt 微软雅黑; WHITE-SPACE: normal; FLOAT: none; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">ind a static ordering, with possible repeats, of optimization passes that does not compromise the quality of the generated code. I find it difficult to start because a single optimization pass or a combo of optimization passes may generate some code that can be optimized by other optimization pass, which can not be decided before.</SPAN></DIV> <DIV style="FONT-FAMILY: 微软雅黑"><SPAN style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; DISPLAY: inline !important; FONT: 10.5pt 微软雅黑; WHITE-SPACE: normal; FLOAT: none; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"></SPAN> </DIV> <DIV style="FONT-FAMILY: 微软雅黑"><SPAN style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; DISPLAY: inline !important; FONT: 10.5pt 微软雅黑; WHITE-SPACE: normal; FLOAT: none; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">Can you give me some advice?</SPAN></DIV> <DIV style="FONT-FAMILY: 微软雅黑"><SPAN style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; DISPLAY: inline !important; FONT: 10.5pt 微软雅黑; WHITE-SPACE: normal; FLOAT: none; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"></SPAN> </DIV> <DIV style="FONT-FAMILY: 微软雅黑"><SPAN style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; DISPLAY: inline !important; FONT: 10.5pt 微软雅黑; WHITE-SPACE: normal; FLOAT: none; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"></SPAN> </DIV> <DIV style="FONT-FAMILY: 微软雅黑"><SPAN style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; DISPLAY: inline !important; FONT: 10.5pt 微软雅黑; WHITE-SPACE: normal; FLOAT: none; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">Best regards,</SPAN></DIV> <DIV style="FONT-FAMILY: 微软雅黑"><SPAN style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; DISPLAY: inline !important; FONT: 10.5pt 微软雅黑; WHITE-SPACE: normal; FLOAT: none; LETTER-SPACING: normal; COLOR: #000000; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">Sida Li</SPAN></DIV> <DIV style="FONT-FAMILY: 微软雅黑"> </DIV></DIV></BODY></HTML>