http://llvm.org/bugs/show_bug.cgi?id=12754
Bug #: 12754
Summary: Identical Instructions are not hoisted above a branch
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 8506
--> http://llvm.org/bugs/attachment.cgi?id=8506
Test case
Identical add instructions should be hoisted above a branch, but are not even
with -O2 or -O3. This makes it harder to identify canonical induction variables
than it should be. The relevant parts of the test case are:
clang -O2 addHoistBug.c -emit-llvm -S -o -
for.body: ; preds = %entry, %for.inc4
br i1 %tobool, label %if.end, label %for.body.for.inc4_crit_edge
for.body.for.inc4_crit_edge: ; preds = %for.body
%inc5.pre = add i32 %i.011, 1
br label %for.inc4
if.end: ; preds = %for.body
%j.07 = add i32 %i.011, 1
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