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; RUN: llc -march=hexagon -mcpu=hexagonv4 -no-phi-elim-live-out-early-exit \
; RUN: < %s | FileCheck %s
; Check that we remove the compare and induction variable instructions
; after generating hardware loops.
; Bug 6685.
; CHECK: loop0
; CHECK-NOT: r{{[0-9]+}}{{.}}={{.}}add(r{{[0-9]+}},{{.}}#-1)
; CHECK-NOT: cmp.eq
; CHECK: endloop0
define i32 @test1(i32* nocapture %b, i32 %n) nounwind readonly {
entry:
%cmp1 = icmp sgt i32 %n, 0
br i1 %cmp1, label %for.body.preheader, label %for.end
for.body.preheader:
br label %for.body
for.body: ; preds = %for.body.preheader, %for.body
%sum.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
%arrayidx.phi = phi i32* [ %arrayidx.inc, %for.body ], [ %b, %for.body.preheader ]
%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
%0 = load i32, i32* %arrayidx.phi, align 4
%add = add nsw i32 %0, %sum.03
%inc = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %inc, %n
%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
br i1 %exitcond, label %for.end.loopexit, label %for.body
for.end.loopexit:
br label %for.end
for.end:
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
ret i32 %sum.0.lcssa
}
; This test checks that that initial loop count value is removed.
; CHECK-NOT: ={{.}}#40
; CHECK: loop0
; CHECK-NOT: r{{[0-9]+}}{{.}}={{.}}add(r{{[0-9]+}},{{.}}#-1)
; CHECK-NOT: cmp.eq
; CHECK: endloop0
define i32 @test2(i32* nocapture %b) nounwind readonly {
entry:
br label %for.body
for.body:
%sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx.phi = phi i32* [ %b, %entry ], [ %arrayidx.inc, %for.body ]
%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i32, i32* %arrayidx.phi, align 4
%add = add nsw i32 %0, %sum.02
%inc = add nsw i32 %i.01, 1
%exitcond = icmp eq i32 %inc, 40
%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i32 %add
}
; This test checks that we don't remove the induction variable since it's used.
; CHECK: loop0
; CHECK: r{{[0-9]+}}{{.}}={{.}}add(r{{[0-9]+}},{{.}}#1)
; CHECK-NOT: cmp.eq
; CHECK: endloop0
define i32 @test3(i32* nocapture %b) nounwind {
entry:
br label %for.body
for.body:
%arrayidx.phi = phi i32* [ %b, %entry ], [ %arrayidx.inc, %for.body ]
%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
store i32 %i.01, i32* %arrayidx.phi, align 4
%inc = add nsw i32 %i.01, 1
%exitcond = icmp eq i32 %inc, 40
%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i32 0
}
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