<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Jay, things changed from gcc 3.2 to 3.3. 3.3 works fine for me on all the h/w targets I've tried using -O3 (PPC, x86, AMD64, SPARC). I suspect this is specific to your gcc-apple hybrid.<div><div apple-content-edited="true"><span class="Apple-style-span" style="border-collapse: separate; 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; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-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; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 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; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><br></div></span></span></span></span></span></span></span></span></div></span></div></span></div><div><div>On 1 Jun 2009, at 00:49, Jay wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; 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; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; ">The bitfield problem still seems present.<br> <br> <br>m3-libs/m3core/src/runtime/common/RTIO.m3:<br> <br> <br>PROCEDURE Flush () =<br> BEGIN<br> IF (len > 0) THEN<br> RTOS.Write (ADR (buf[0]), len);<br> len := 0;<br> END;<br> END Flush.<br> <br> <br>In question is just the line "len := 0", it is line 79, len is a module-global.<br> <br> <br>Without any optimization, the bitfield code yields:<br> <br> .stabd 68,0,79<br> ldr r3, L53+12 @ tmp110,<br>L51:<br> add r3, pc, r3 @ tmp110, tmp110<br> ; r3 contains the address of the module globals<span class="Apple-converted-space"> </span><br> mov r2, r3 @ tmp109, tmp110<br> ; now r2 does<span class="Apple-converted-space"> </span><br> ldr r3, [r2, #52] @,<br> ; r3 now contains the address of len<br> str r3, [sp, #0] @,<br> ldr r3, [sp, #0] @ tmp112,<br> str r3, [sp, #0] @ tmp112,<br> ldr r3, [sp, #0] @,<br> str r3, [r2, #52] @,<br><br>which I believe never actually stores to the global -- at least not any value it doesn't already have.<br> <br> <br>The non-bitfield code, again, not optimized, yields:<br> <br> .stabd 68,0,79<br> ldr r3, L53+12 @ tmp113,<br>L51:<br> add r3, pc, r3 @ tmp113, tmp113<br> add r3, r3, #52 @ D.789, tmp113,<br> ; r3 now contains the address of len<br> mov r2, r3 @ D.790, D.789<br> ; now r2 does <br> mov r3, #0 @ tmp114,<br> ; r3=0<br> str r3, [r2, #0] @ tmp114,* D.790<br> ; len=0<span class="Apple-converted-space"> </span><br> <br> <br>Which is pretty clearly ok -- it is actually putting zero in a register and storing that in the global.<br> <br> <br>Granted, this is using gcc 4.2 (the gcc-apple directory). Some/all of the volitization is skipped, but has that ever been a problem when not optimizing?<br>(actually I think it has, I remember debugging an m3/cygwin problem early on where code got thrown out because the compiler didn't think it did anything, I don't remember the details)<br> <br>Anyway, the #ifndef GCC_APPLE does workaround this successfully -- cm3 does startup ok on my iphone :).<br>It's that this bitfield stuff also caused problems on Mips so I'm leary of it, I wonder if it is just not a great idea.<br> <br> <br> - Jay<br> <br>><br>> >><br>> >> m3_load/store using bitfields for everything caused module-global<br>> >> references to disappear on MIPS64_OPENBSD (all MIPS?). I worked<br>> >> around that by declaring that the module-globals are at least of<br>> >> size 2 * biggest_alignment.<br></div></span></blockquote></div><br></div></body></html>