Hello, I have two for loops (one inside the other), that after indvars, looprotate, etc. (the important here is the loop rotate), is similar to this (I’ve stripped the real operations):
define i32 @f() nounwind {
entry:
br label %bb1
bb1: ; preds = %bb3, %bb1, %entry
%i.0.reg2mem.0.ph = phi i32 [ 0, %entry ], [ %i.0.reg2mem.0.ph, %bb1 ], [ %indvar.next9, %bb3 ] ; [#uses=4]
%j.0.reg2mem.0 = phi i32 [ 0, %entry ], [ %indvar.next, %bb1 ], [ 0, %bb3 ] ; [#uses=3]
%indvar.next = add i32 %j.0.reg2mem.0, 1 ; [#uses=2]
%exitcond = icmp eq i32 %indvar.next, 16 ; [#uses=1]
br i1 %exitcond, label %bb3, label %bb1
bb3: ; preds = %bb1
%indvar.next9 = add i32 %i.0.reg2mem.0.ph, 1 ; [#uses=2]
%exitcond10 = icmp eq i32 %indvar.next9, 32 ; [#uses=1]
br i1 %exitcond10, label %bb6, label %bb1
bb6: ; preds = %bb3
ret i32 0
}
LoopInfo says: Loop Containing: %bb1, %bb3. Only detects the outer loop
By the way, if I separate the header of the outer loop, like:
define i32 @f() nounwind {
entry:
br label %bb0
bb0: ; preds = %entry, %bb3
%i.0.reg2mem.0.ph = phi i32 [ 0, %entry ], [ %indvar.next9, %bb3 ] ; [#uses=4]
br label %bb1
bb1: ; preds = %bb1, %bb0
%j.0.reg2mem.0 = phi i32 [ 0, %bb0 ], [ %indvar.next, %bb1 ] ; [#uses=3]
%indvar.next = add i32 %j.0.reg2mem.0, 1 ; [#uses=2]
%exitcond = icmp eq i32 %indvar.next, 16 ; [#uses=1]
br i1 %exitcond, label %bb3, label %bb1
bb3: ; preds = %bb1
%indvar.next9 = add i32 %i.0.reg2mem.0.ph, 1 ; [#uses=2]
%exitcond10 = icmp eq i32 %indvar.next9, 32 ; [#uses=1]
br i1 %exitcond10, label %bb6, label %bb0
bb6: ; preds = %bb3
ret i32 0
}
LoopInfo:
Loop Containing: %bb0, %bb3, %bb1
Loop Containing: %bb1
I would need to operate in the two loops in rotated form. It can be considered a bug or I have to introduce manually the header (or modify myself the ConsiderForLoop to my particular problem)?
Thanks.
Julio