forked from OSchip/llvm-project
34 lines
1.2 KiB
LLVM
34 lines
1.2 KiB
LLVM
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; RUN: opt -loop-load-elim -S < %s | FileCheck %s
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; Make sure we create a preheader if we dont' have one.
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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define void @f(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N, i1 %C) {
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entry:
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br i1 %C, label %for.body, label %for.end
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; CHECK: for.body.preheader:
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; CHECK-NEXT: %load_initial = load i32, i32* %A
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; CHECK-NEXT: br label %for.body
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; CHECK: for.body:
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for.body:
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; CHECK-NEXT: %store_forwarded = phi i32 [ %load_initial, %for.body.preheader ], [ %add, %for.body ]
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
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%load = load i32, i32* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
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%load_1 = load i32, i32* %arrayidx2, align 4
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; CHECK: %add = add i32 %load_1, %store_forwarded
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%add = add i32 %load_1, %load
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
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store i32 %add, i32* %arrayidx_next, align 4
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%exitcond = icmp eq i64 %indvars.iv.next, %N
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret void
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}
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