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Add support for reduction variables when IF-conversion is enabled.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169288 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-12-04 18:17:33 +00:00
parent 4b3aafb4b2
commit f6088d126e
2 changed files with 71 additions and 10 deletions
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48
test/Transforms/LoopVectorize/if-conversion.ll
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@@ -58,3 +58,51 @@ if.end:
for.end:
ret i32 undef
}
; int func(int *A, int n) {
; unsigned sum = 0;
; for (int i = 0; i < n; ++i)
; if (A[i] > 30)
; sum += A[i] + 2;
;
; return sum;
; }
;CHECK: @reduction_func
;CHECK: load <4 x i32>
;CHECK: icmp sgt <4 x i32>
;CHECK: add <4 x i32>
;CHECK: select <4 x i1>
;CHECK: ret i32
define i32 @reduction_func(i32* nocapture %A, i32 %n) nounwind uwtable readonly ssp {
entry:
%cmp10 = icmp sgt i32 %n, 0
br i1 %cmp10, label %for.body, label %for.end
for.body: ; preds = %entry, %for.inc
%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
%sum.011 = phi i32 [ %sum.1, %for.inc ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv
%0 = load i32* %arrayidx, align 4
%cmp1 = icmp sgt i32 %0, 30
br i1 %cmp1, label %if.then, label %for.inc
if.then: ; preds = %for.body
%add = add i32 %sum.011, 2
%add4 = add i32 %add, %0
br label %for.inc
for.inc: ; preds = %for.body, %if.then
%sum.1 = phi i32 [ %add4, %if.then ], [ %sum.011, %for.body ]
%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.inc, %entry
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1, %for.inc ]
ret i32 %sum.0.lcssa
}