<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"><base href="x-msg://1996/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On May 9, 2012, at 6:27 AM, Jonas Paulsson <<a href="mailto:jonas.paulsson@ericsson.com">jonas.paulsson@ericsson.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="EN-US" link="blue" vlink="purple" style="font-family: Optima; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="Section1" style="page: Section1; "><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; ">Hi,<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> </span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">Recently code using IMPLICIT_DEF and INSERT_SUBREG started to break:<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> </span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> <span class="Apple-converted-space"> </span></span></font><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; ">%vreg9<def> = IMPLICIT_DEF<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> %vreg10<def> = INSERT_SUBREG %vreg9<kill>, %vreg1<kill>, hi<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> %vreg12<def> = sub %vreg10<kill>, %vreg11<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; ">=><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> %vreg10<def> = IMPLICIT_DEF<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> %vreg10:hi<def> = COPY %vreg1<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> %vreg12<def> = sub %vreg10<kill>, %vreg11<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; ">=><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> %vreg10:hi<def,read-undef> = COPY %vreg1<kill>, %vreg10<imp-def><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; "> %vreg12<def> = sub %vreg10<kill>, %vreg11<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">=><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> %vreg10:hi<def,read-undef> = COPY %a1_h<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> <span class="Apple-converted-space"> </span></span></font><font size="2" face="Arial"><span lang="SV" style="font-size: 10pt; font-family: Arial; ">%vreg12<def> = sub %vreg10<kill>, %vreg11<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">=><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> %a2_h<def> = COPY %a1_h<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> %a2<def> = sub %a2<kill>, %a3<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> </span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">*** Bad machine code: Using an undefined physical register ***<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">- function: array<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">- basic block: 0x43ac7d0 (BB#0)<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">- instruction: %a2<def> = sub %a2<kill>, %a3<kill<o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">- operand 1: %a2<kill><o:p></o:p></span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; "> </span></font></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; "><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; ">This all worked well before. Is there a change somewhere in the framework that will make the code on top wrong?</span></font></div></div></div></blockquote><div><br></div><div>This looks like a bug in the register allocator you are using. There should have been an %a2<imp-def> operand added to the copy instruction when rewriting virtual registers to physical registers.</div><div><br></div><div>Please file a PR, preferably with a test case for an in-target tree. Don't forget to state which register allocator you are using.</div><div><br></div><div>/jakob</div><div><br></div></div></body></html>