derek.holloway
7502bf64a4
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39 lines
1.3 KiB
LLVM
39 lines
1.3 KiB
LLVM
; RUN: opt -S -verify-memoryssa -passes=loop-sink < %s | FileCheck %s
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; RUN: opt -S -verify-memoryssa -aa-pipeline=basic-aa -passes=loop-sink < %s | FileCheck %s
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; The load instruction should not be sunk into following loop.
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; CHECK: @foo
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; CHECK-NEXT: entry
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; CHECK-NEXT: %ptr = load ptr, ptr %pp, align 8
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; CHECK-NEXT: store ptr null, ptr %pp, align 8
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define i32 @foo(i32 %n, ptr %pp) !prof !0 {
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entry:
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%ptr = load ptr, ptr %pp, align 8
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store ptr null, ptr %pp, align 8
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br label %for.cond
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for.cond: ; preds = %for.body, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%cmp = icmp ult i32 %i.0, %n
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br i1 %cmp, label %for.body, label %for.end, !prof !1
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for.body: ; preds = %for.cond
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%0 = sext i32 %i.0 to i64
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%arrayidx = getelementptr inbounds i8, ptr %ptr, i64 %0
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%1 = load i8, ptr %arrayidx, align 1
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%or19 = call i8 @llvm.bitreverse.i8(i8 %1)
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%v = sext i8 %or19 to i32
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%inc = add i32 %i.0, %v
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br label %for.cond
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for.end: ; preds = %for.cond
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ret i32 %i.0
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}
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declare i8 @llvm.bitreverse.i8(i8) #0
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attributes #0 = { nounwind readnone speculatable }
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!0 = !{!"function_entry_count", i64 1}
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!1 = !{!"branch_weights", i32 1, i32 2000}
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