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add a testcase for 

void test9(int N, double* G) {
  long j;
  for (j = 1; j < N - 1; j++)
      G[j+1] = G[j] + G[j+1];
}

llvm-svn: 90047
This commit is contained in:
Chris Lattner 2009-11-29 01:04:40 +00:00
parent cd261c9c26
commit a73adac52e
1 changed files with 45 additions and 0 deletions
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45
llvm/test/Transforms/GVN/pre-load.ll
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@ -268,4 +268,49 @@ block4:
; CHECK: ret i32
}
;void test9(int N, double* G) {
; long j;
; for (j = 1; j < N - 1; j++)
; G[j+1] = G[j] + G[j+1];
;}
; This requires phi translation of the adds.
define void @test9(i32 %N, double* nocapture %G) nounwind ssp {
entry:
add i32 0, 0
%1 = add i32 %N, -1
%2 = icmp sgt i32 %1, 1
br i1 %2, label %bb.nph, label %return
bb.nph:
%tmp = sext i32 %1 to i64
%tmp7 = add i64 %tmp, -1
br label %bb
; CHECK: bb.nph:
; CHECK: load double*
; CHECK: br label %bb
bb:
%indvar = phi i64 [ 0, %bb.nph ], [ %tmp9, %bb ]
%tmp8 = add i64 %indvar, 2
%scevgep = getelementptr double* %G, i64 %tmp8
%tmp9 = add i64 %indvar, 1
%scevgep10 = getelementptr double* %G, i64 %tmp9
%3 = load double* %scevgep10, align 8
%4 = load double* %scevgep, align 8
%5 = fadd double %3, %4
store double %5, double* %scevgep, align 8
%exitcond = icmp eq i64 %tmp9, %tmp7
br i1 %exitcond, label %return, label %bb
; Should only be one load in the loop.
; CHECK: bb:
; CHECK: load double*
; CHECK-NOT: load double*
; CHECK: br i1 %exitcond
return:
ret void
}