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Implement rdar://9009151, transforming strided loop stores of

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unsplatable values into memset_pattern16 when it is available
(recent darwins).  This transforms lots of strided loop stores
of ints for example, like 5 in vpr:

  Formed memset:   call void @memset_pattern16(i8* %4, i8* getelementptr inbounds ([16 x i8]* @.memset_pattern9, i32 0, i32 0), i64 %tmp25)
    from store to: {%3,+,4}<%11> at:   store i32 3, i32* %scevgep, align 4, !tbaa !4




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126040 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-02-19 19:31:39 +00:00
parent 9bb83e4f48
commit 3a393728a6
2 changed files with 153 additions and 33 deletions
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27
test/Transforms/LoopIdiom/basic.ll
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@@ -273,3 +273,30 @@ for.end13: ; preds = %for.inc10
; CHECK-NOT: store
; CHECK: ret void
}
; On darwin10 (which is the triple in this .ll file) this loop can be turned
; into a memset_pattern call.
; rdar://9009151
define void @test11(i32* nocapture %P) nounwind ssp {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.body ]
%arrayidx = getelementptr i32* %P, i64 %indvar
store i32 1, i32* %arrayidx, align 4
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, 10000
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK: @test11
; CHECK-NEXT: entry:
; CHECK-NEXT: bitcast
; CHECK-NEXT: memset_pattern
; CHECK-NOT: store
; CHECK: ret void
}