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<body><span class="vcard"><a class="email" href="mailto:florian_hahn@apple.com" title="Florian Hahn <florian_hahn@apple.com>"> <span class="fn">Florian Hahn</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Should recognize memset loop with a global induction variable"
href="https://bugs.llvm.org/show_bug.cgi?id=14753">bug 14753</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>CONFIRMED
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>florian_hahn@apple.com
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Should recognize memset loop with a global induction variable"
href="https://bugs.llvm.org/show_bug.cgi?id=14753#c13">Comment # 13</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Should recognize memset loop with a global induction variable"
href="https://bugs.llvm.org/show_bug.cgi?id=14753">bug 14753</a>
from <span class="vcard"><a class="email" href="mailto:florian_hahn@apple.com" title="Florian Hahn <florian_hahn@apple.com>"> <span class="fn">Florian Hahn</span></a>
</span></b>
<pre>This is optimized to a memset now <a href="https://godbolt.org/z/aTrfqc">https://godbolt.org/z/aTrfqc</a>
@gi = dso_local local_unnamed_addr global i32 0, align 4
define dso_local void @_Z4foo2iPf(i32 %0, float* nocapture %1)
local_unnamed_addr #0 {
store i32 0, i32* @gi, align 4, !tbaa !2
%3 = icmp sgt i32 %0, 0
br i1 %3, label %4, label %8
4: ; preds = %2
%5 = bitcast float* %1 to i8*
%6 = zext i32 %0 to i64
%7 = shl nuw nsw i64 %6, 2
call void @llvm.memset.p0i8.i64(i8* align 4 %5, i8 0, i64 %7, i1 false)
store i32 %0, i32* @gi, align 4, !tbaa !2
br label %8
8: ; preds = %4, %2
ret void
}
declare void @llvm.memset.p0i8.i64(i8* nocapture writeonly, i8, i64, i1 immarg)
#1
attributes #0 = { nofree norecurse nounwind uwtable mustprogress
"disable-tail-calls"="false" "frame-pointer"="none"
"less-precise-fpmad"="false" "min-legal-vector-width"="0"
"no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false"
"no-signed-zeros-fp-math"="false" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="x86-64"
"target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic"
"unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { argmemonly nofree nosync nounwind willreturn writeonly }</pre>
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