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LoopVectorize: Look for consecutive acces in GEPs with trailing zero indices

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If we have a pointer to a single-element struct we can still build wide loads
and stores to it (if there is no padding).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193860 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2013-11-01 14:09:50 +00:00
parent 6186de5c54
commit 7208b0763c
2 changed files with 80 additions and 11 deletions
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test/Transforms/LoopVectorize/struct_access.ll
+42
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@@ -44,3 +44,45 @@ for.end: ; preds = %for.body, %entry
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
ret i32 %sum.0.lcssa
}
%struct.lit = type { i32 }
; Verify that we still vectorize the access if the struct has the same size as
; the loaded element.
; struct lit {
; int x;
; };
;
;
; int bar(struct lit *A, int n) {
;
; int sum = 0;
; for (int i = 0; i < n; ++i)
; sum += A[i].x;
;
; return sum;
; }
;CHECK-LABEL: @bar(
;CHECK: load <4 x i32>
;CHECK: ret
define i32 @bar(%struct.lit* nocapture %A, i32 %n) nounwind uwtable readonly ssp {
entry:
%cmp4 = icmp sgt i32 %n, 0
br i1 %cmp4, label %for.body, label %for.end
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%sum.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
%x = getelementptr inbounds %struct.lit* %A, i64 %indvars.iv, i32 0
%0 = load i32* %x, align 4
%add = add nsw i32 %0, %sum.05
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
ret i32 %sum.0.lcssa
}