<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On Jan 16, 2008, at 11:49 AM, David Greene wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I had been assuming that give a LiveRange a, a.valno->def, if</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">valid, would be the same as a.start.<span class="Apple-converted-space"> </span>But this is apparently not</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">always the case.<span class="Apple-converted-space"> </span>For example:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><span class="Apple-converted-space"> </span>Predecessors according to CFG: 0x839d130 (#3) 0x8462780 (#35)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">308<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1051 = MOV64rr %reg1227<kill></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">312<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1052 = MOV64rr %reg1228<kill></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">316<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1053 = MOV64rr %reg1229<kill></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">320<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1054 = MOV64rr %reg1230<kill></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">324<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1055<dead> = LEA64r %reg1047, 1, %reg1053, 0</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">328<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1135 = MOVSX64rr32 %reg1025</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">332<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1136 = MOV64rr %reg1135<kill></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">336<span class="Apple-tab-span" style="white-space:pre"> </span>%reg1136 = ADD64ri32 %reg1136, -4, %EFLAGS<imp-def,dead></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">340<span class="Apple-tab-span" style="white-space:pre"> </span>TEST64rr %reg1136<kill>, %reg1136, %EFLAGS<imp-def></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">344<span class="Apple-tab-span" style="white-space:pre"> </span>JNS mbb<file solve.f, line 23, in loop at depth 1, bb16,0x83a2c70>,<span class="Apple-converted-space"> </span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">%EFLAGS<imp-use,kill></div></blockquote><br></div><div>David, could you post the live ins/outs for the block? My thinking is that %reg1055 may be live through the block.</div><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>--</div><div>Christopher Lamb</div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></span> </div><br></body></html>