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LoopVectorizer: Add a test case for unrolling of small loops that need a runtime 

check.

llvm-svn: 200408
This commit is contained in:
Arnold Schwaighofer 2014-01-29 18:55:44 +00:00
parent c25b0c7e12
commit 85a26704e9
1 changed files with 23 additions and 0 deletions
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23
llvm/test/Transforms/LoopVectorize/X86/unroll-small-loops.ll
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@ -48,3 +48,26 @@ define i32 @bar(i32* nocapture %A, i32 %n) nounwind uwtable ssp {
._crit_edge: ; preds = %.lr.ph, %0
ret i32 undef
}
; Also unroll if we need a runtime check.
; CHECK-LABEL: runtime_chk
; CHECK: store <4 x float>
; CHECK: store <4 x float>
define void @runtime_chk(float* %A, float* %B, float %N) {
entry:
br label %for.body
for.body:
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds float* %B, i64 %indvars.iv
%0 = load float* %arrayidx, align 4
%mul = fmul float %0, %N
%arrayidx2 = getelementptr inbounds float* %A, i64 %indvars.iv
store float %mul, float* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 256
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}