<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi All,<div class=""><br class=""></div><div class="">This simple loop code</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">void</span> loopTest()</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class="">{</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class=""> <span style="color: #ba2da2" class="">for</span> ( <span style="color: #ba2da2" class="">int</span> i = <span style="color: #272ad8" class="">0</span> ; i<<span style="color: #272ad8" class="">10</span> ; i++ ) {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class=""> ftest();</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class=""> }</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class="">}</div></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">gets converted into this when compiled with the -Os flags:</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Monaco; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px;" class=""><br class=""></span></div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255);" class=""><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><div style="margin: 0px; line-height: normal;" class="">; Function Attrs: nounwind optsize uwtable</div><div style="margin: 0px; line-height: normal;" class="">define void @loopTest() local_unnamed_addr #0 {</div><div style="margin: 0px; line-height: normal;" class="">entry:</div><div style="margin: 0px; line-height: normal;" class=""> br label %for.body</div><div style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">for.cond.cleanup: ; preds = %for.body</div><div style="margin: 0px; line-height: normal;" class=""> ret void</div><div style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">for.body: ; preds = %for.body, %entry</div><div style="margin: 0px; line-height: normal;" class=""> %i.03 = phi i32 [ 0, %entry ], [ %inc, %for.body ]</div><div style="margin: 0px; line-height: normal;" class=""> %call = tail call i32 (...) @ftest() #2</div><div style="margin: 0px; line-height: normal;" class=""> %inc = add nuw nsw i32 %i.03, 1</div><div style="margin: 0px; line-height: normal;" class=""> %exitcond = icmp eq i32 %inc, 10</div><div style="margin: 0px; line-height: normal;" class=""> br i1 %exitcond, label %for.cond.cleanup, label %for.body</div><div style="margin: 0px; line-height: normal;" class="">}</div></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><br class=""></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">For the x86 architecture, this gets compiled into this</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class=""><br class=""></span></div><div style="margin: 0px; line-height: normal;" class=""><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.section<span class="Apple-tab-span" style="white-space:pre"> </span>__TEXT,__text,regular,pure_instructions</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.macosx_version_min <span style="color: #272ad8" class="">10</span>, <span style="color: #272ad8" class="">12</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.globl<span class="Apple-tab-span" style="white-space:pre"> </span>_loopTest <span style="color: #008400" class="">## -- Begin function loopTest</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class="">_loopTest: <span style="color: #008400" class="">## @loopTest</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_startproc</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class="">## %bb.0: ## %entry</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>pushq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbp <span style="color: #008400" class="">## encoding: [0x55]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_def_cfa_offset <span style="color: #272ad8" class="">16</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_offset %rbp, <span style="color: #272ad8" class="">-16</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>movq<span class="Apple-tab-span" style="white-space:pre"> </span>%rsp, %rbp <span style="color: #008400" class="">## encoding: [0x48,0x89,0xe5]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_def_cfa_register %rbp</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>pushq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbx <span style="color: #008400" class="">## encoding: [0x53]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>pushq<span class="Apple-tab-span" style="white-space:pre"> </span>%rax <span style="color: #008400" class="">## encoding: [0x50]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_offset %rbx, <span style="color: #272ad8" class="">-24</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>movl<span class="Apple-tab-span" style="white-space:pre"> </span>$</span><span style="color: #272ad8" class="">10</span><span style="color: #000000" class="">, %ebx </span>## encoding: [0xbb,0x0a,0x00,0x00,0x00]</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class="">LBB0_<span style="color: #272ad8" class="">1</span>: <span style="color: #008400" class="">## %for.body</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""> <span style="color: #008400" class="">## =>This Inner Loop Header: Depth=1</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>xorl<span class="Apple-tab-span" style="white-space:pre"> </span>%eax, %eax <span style="color: #008400" class="">## encoding: [0x31,0xc0]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>callq<span class="Apple-tab-span" style="white-space:pre"> </span>_ftest <span style="color: #008400" class="">## encoding: [0xe8,A,A,A,A]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""> </span>## fixup A - offset: 1, value: _ftest-4, kind: reloc_branch_4byte_pcrel</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>decl<span class="Apple-tab-span" style="white-space:pre"> </span>%ebx <span style="color: #008400" class="">## encoding: [0xff,0xcb]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>jne<span class="Apple-tab-span" style="white-space:pre"> </span>LBB0_<span style="color: #272ad8" class="">1</span> <span style="color: #008400" class="">## encoding: [0x75,A]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""> </span>## fixup A - offset: 1, value: LBB0_1-1, kind: FK_PCRel_1</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class="">## %bb.2: ## %for.cond.cleanup</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>addq<span class="Apple-tab-span" style="white-space:pre"> </span>$</span><span style="color: #272ad8" class="">8</span><span style="color: #000000" class="">, %rsp </span>## encoding: [0x48,0x83,0xc4,0x08]</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>popq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbx <span style="color: #008400" class="">## encoding: [0x5b]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>popq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbp <span style="color: #008400" class="">## encoding: [0x5d]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>retq <span style="color: #008400" class="">## encoding: [0xc3]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_endproc</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""> <span style="color: #008400" class="">## -- End function</span></div><div style="font-family: Helvetica; font-size: 12px; margin: 0px; line-height: normal; min-height: 14px;" class=""><br class=""></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><br class=""></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><br class=""></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">The same code compiled with -Oz results in the following:</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class=""><br class=""></span></div><div style="margin: 0px; line-height: normal;" class=""><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><div style="margin: 0px; line-height: normal;" class=""><div style="margin: 0px; line-height: normal;" class="">; Function Attrs: minsize nounwind optsize uwtable</div><div style="margin: 0px; line-height: normal;" class="">define void @loopTest() local_unnamed_addr #0 {</div><div style="margin: 0px; line-height: normal;" class="">entry:</div><div style="margin: 0px; line-height: normal;" class=""> br label %for.cond</div><div style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">for.cond: ; preds = %for.body, %entry</div><div style="margin: 0px; line-height: normal;" class=""> %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]</div><div style="margin: 0px; line-height: normal;" class=""> %exitcond = icmp eq i32 %i.0, 10</div><div style="margin: 0px; line-height: normal;" class=""> br i1 %exitcond, label %for.cond.cleanup, label %for.body</div><div style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">for.cond.cleanup: ; preds = %for.cond</div><div style="margin: 0px; line-height: normal;" class=""> ret void</div><div style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">for.body: ; preds = %for.cond</div><div style="margin: 0px; line-height: normal;" class=""> %call = tail call i32 (...) @ftest() #2</div><div style="margin: 0px; line-height: normal;" class=""> %inc = add nuw nsw i32 %i.0, 1</div><div style="margin: 0px; line-height: normal;" class=""> br label %for.cond</div><div style="margin: 0px; line-height: normal;" class="">}</div></div></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><br class=""></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">and this</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class=""><br class=""></span></div><div style="margin: 0px; line-height: normal;" class=""><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.section<span class="Apple-tab-span" style="white-space:pre"> </span>__TEXT,__text,regular,pure_instructions</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.macosx_version_min <span style="color: #272ad8" class="">10</span>, <span style="color: #272ad8" class="">12</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.globl<span class="Apple-tab-span" style="white-space:pre"> </span>_loopTest <span style="color: #008400" class="">## -- Begin function loopTest</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class="">_loopTest: <span style="color: #008400" class="">## @loopTest</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_startproc</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class="">## %bb.0: ## %entry</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>pushq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbp <span style="color: #008400" class="">## encoding: [0x55]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_def_cfa_offset <span style="color: #272ad8" class="">16</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_offset %rbp, <span style="color: #272ad8" class="">-16</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>movq<span class="Apple-tab-span" style="white-space:pre"> </span>%rsp, %rbp <span style="color: #008400" class="">## encoding: [0x48,0x89,0xe5]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_def_cfa_register %rbp</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>pushq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbx <span style="color: #008400" class="">## encoding: [0x53]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>pushq<span class="Apple-tab-span" style="white-space:pre"> </span>%rax <span style="color: #008400" class="">## encoding: [0x50]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_offset %rbx, <span style="color: #272ad8" class="">-24</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>pushq<span class="Apple-tab-span" style="white-space:pre"> </span>$<span style="color: #272ad8" class="">10</span> <span style="color: #008400" class="">## encoding: [0x6a,0x0a]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>popq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbx <span style="color: #008400" class="">## encoding: [0x5b]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class="">LBB0_<span style="color: #272ad8" class="">1</span>: <span style="color: #008400" class="">## %for.cond</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""> <span style="color: #008400" class="">## =>This Inner Loop Header: Depth=1</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>testl<span class="Apple-tab-span" style="white-space:pre"> </span>%ebx, %ebx <span style="color: #008400" class="">## encoding: [0x85,0xdb]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>je<span class="Apple-tab-span" style="white-space:pre"> </span>LBB0_<span style="color: #272ad8" class="">2</span> <span style="color: #008400" class="">## encoding: [0x74,A]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""> </span>## fixup A - offset: 1, value: LBB0_2-1, kind: FK_PCRel_1</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class="">## %bb.3: ## %for.body</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""> <span style="color: #008400" class="">## in Loop: Header=BB0_1 Depth=1</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>xorl<span class="Apple-tab-span" style="white-space:pre"> </span>%eax, %eax <span style="color: #008400" class="">## encoding: [0x31,0xc0]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>callq<span class="Apple-tab-span" style="white-space:pre"> </span>_ftest <span style="color: #008400" class="">## encoding: [0xe8,A,A,A,A]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""> </span>## fixup A - offset: 1, value: _ftest-4, kind: reloc_branch_4byte_pcrel</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>decl<span class="Apple-tab-span" style="white-space:pre"> </span>%ebx <span style="color: #008400" class="">## encoding: [0xff,0xcb]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>jmp<span class="Apple-tab-span" style="white-space:pre"> </span>LBB0_<span style="color: #272ad8" class="">1</span> <span style="color: #008400" class="">## encoding: [0xeb,A]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""> </span>## fixup A - offset: 1, value: LBB0_1-1, kind: FK_PCRel_1</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class="">LBB0_<span style="color: #272ad8" class="">2</span>: <span style="color: #008400" class="">## %for.cond.cleanup</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal; color: rgb(0, 132, 0);" class=""><span style="color: #000000" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>addq<span class="Apple-tab-span" style="white-space:pre"> </span>$</span><span style="color: #272ad8" class="">8</span><span style="color: #000000" class="">, %rsp </span>## encoding: [0x48,0x83,0xc4,0x08]</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>popq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbx <span style="color: #008400" class="">## encoding: [0x5b]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>popq<span class="Apple-tab-span" style="white-space:pre"> </span>%rbp <span style="color: #008400" class="">## encoding: [0x5d]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>retq <span style="color: #008400" class="">## encoding: [0xc3]</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>.cfi_endproc</div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""> <span style="color: #008400" class="">## -- End function</span></div><div style="font-family: Helvetica; font-size: 12px; margin: 0px; line-height: normal; min-height: 14px;" class=""><br class=""></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">The resulting loop body code for -Oz is longer than -Os. This is because the exit loop comparison is performed at the beginning of the loop resulting in an additional jump instruction and missing opportunity to fold the exit condition with the iv decrement.</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class=""><br class=""></span></div><div style="margin: 0px; line-height: normal;" class="">I believe this is a regression from Version 7.0, as I don’t recall having seen this previously. This affects most targets.</div><div style="margin: 0px; line-height: normal;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">Should I create a bug report for that?</div><div style="margin: 0px; line-height: normal;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">Thanks.</div></div></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class=""><br class=""></span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">John</span></div><div style="font-family: Monaco; font-size: 11px; margin: 0px; line-height: normal;" class=""><span style="font-family: Helvetica; font-size: 12px;" class=""><br class=""></span></div></div></div></body></html>