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; RUN: llc -march=hexagon -hexagon-hwloop-preheader < %s | FileCheck %s
; Generate hardware loops when we also need to add a new preheader.
; we should generate two hardware loops for this test case.
; CHECK: loop0
; CHECK: endloop0
; CHECK: loop0
; CHECK: endloop0
@g = external global i32
define void @test(ptr nocapture %a, ptr nocapture %b, i32 %n) nounwind {
entry:
%tobool = icmp eq i32 %n, 0
br i1 %tobool, label %for.body4.preheader, label %for.body.preheader
for.body.preheader:
br label %for.body
for.body:
%arrayidx.phi = phi ptr [ %arrayidx.inc, %for.body ], [ %a, %for.body.preheader ]
%i.014 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
%0 = load i32, ptr @g, align 4
store i32 %0, ptr %arrayidx.phi, align 4
%inc = add nsw i32 %i.014, 1
%exitcond15 = icmp eq i32 %inc, 3
%arrayidx.inc = getelementptr i32, ptr %arrayidx.phi, i32 1
br i1 %exitcond15, label %for.body4.preheader.loopexit, label %for.body
for.body4.preheader.loopexit:
br label %for.body4.preheader
for.body4.preheader:
br label %for.body4
for.body4:
%arrayidx5.phi = phi ptr [ %arrayidx5.inc, %for.body4 ], [ %b, %for.body4.preheader ]
%i1.013 = phi i32 [ %inc7, %for.body4 ], [ 0, %for.body4.preheader ]
%1 = load i32, ptr @g, align 4
store i32 %1, ptr %arrayidx5.phi, align 4
%inc7 = add nsw i32 %i1.013, 1
%exitcond = icmp eq i32 %inc7, 3
%arrayidx5.inc = getelementptr i32, ptr %arrayidx5.phi, i32 1
br i1 %exitcond, label %for.end8, label %for.body4
for.end8:
ret void
}
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