forked from OSchip/llvm-project
87 lines
2.5 KiB
LLVM
87 lines
2.5 KiB
LLVM
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; RUN: llc -march=hexagon -mcpu=hexagonv4 < %s | FileCheck %s
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; Check that we remove the compare and induction variable instructions
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; after generating hardware loops.
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; Bug 6685.
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; CHECK: loop0
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; CHECK-NOT: r{{[0-9]+}}{{.}}={{.}}add(r{{[0-9]+}},{{.}}#-1)
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; CHECK-NOT: cmp.eq
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; CHECK: endloop0
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define i32 @test1(i32* nocapture %b, i32 %n) nounwind readonly {
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entry:
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%cmp1 = icmp sgt i32 %n, 0
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br i1 %cmp1, label %for.body.preheader, label %for.end
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for.body.preheader:
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br label %for.body
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for.body: ; preds = %for.body.preheader, %for.body
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%sum.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx.phi = phi i32* [ %arrayidx.inc, %for.body ], [ %b, %for.body.preheader ]
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%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
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%0 = load i32* %arrayidx.phi, align 4
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%add = add nsw i32 %0, %sum.03
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%inc = add nsw i32 %i.02, 1
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%exitcond = icmp eq i32 %inc, %n
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%arrayidx.inc = getelementptr i32* %arrayidx.phi, i32 1
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit:
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br label %for.end
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for.end:
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%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
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ret i32 %sum.0.lcssa
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}
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; This test checks that that initial loop count value is removed.
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; CHECK-NOT: ={{.}}#40
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; CHECK: loop0
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; CHECK-NOT: r{{[0-9]+}}{{.}}={{.}}add(r{{[0-9]+}},{{.}}#-1)
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; CHECK-NOT: cmp.eq
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; CHECK: endloop0
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define i32 @test2(i32* nocapture %b) nounwind readonly {
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entry:
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br label %for.body
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for.body:
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%sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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%arrayidx.phi = phi i32* [ %b, %entry ], [ %arrayidx.inc, %for.body ]
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%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%0 = load i32* %arrayidx.phi, align 4
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%add = add nsw i32 %0, %sum.02
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%inc = add nsw i32 %i.01, 1
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%exitcond = icmp eq i32 %inc, 40
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%arrayidx.inc = getelementptr i32* %arrayidx.phi, i32 1
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret i32 %add
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}
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; This test checks that we don't remove the induction variable since it's used.
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; CHECK: loop0
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; CHECK: r{{[0-9]+}}{{.}}={{.}}add(r{{[0-9]+}},{{.}}#1)
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; CHECK-NOT: cmp.eq
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; CHECK: endloop0
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define i32 @test3(i32* nocapture %b) nounwind {
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entry:
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br label %for.body
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for.body:
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%arrayidx.phi = phi i32* [ %b, %entry ], [ %arrayidx.inc, %for.body ]
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%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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store i32 %i.01, i32* %arrayidx.phi, align 4
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%inc = add nsw i32 %i.01, 1
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%exitcond = icmp eq i32 %inc, 40
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%arrayidx.inc = getelementptr i32* %arrayidx.phi, i32 1
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret i32 0
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}
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