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50fb46983c
in the duplicated block instead of duplicating them. Duplicating them into the end of the loop and the preheader means that we got a phi node in the header of the loop, which prevented LICM from hoisting them. GVN would usually come around later and merge the duplicated instructions so we'd get reasonable output... except that anything dependent on the shoulda-been-hoisted value can't be hoisted. In PR5319 (which this fixes), a memory value didn't get promoted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113134 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
1.2 KiB
LLVM
36 lines
1.2 KiB
LLVM
; RUN: opt -S -loop-rotate %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.0.0"
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; PR5319 - The "arrayidx" gep should be hoisted, not duplicated. We should
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; end up with one phi node.
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define void @test1() nounwind ssp {
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; CHECK: @test1
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entry:
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%array = alloca [20 x i32], align 16
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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 slt i32 %i.0, 100
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%arrayidx = getelementptr inbounds [20 x i32]* %array, i64 0, i64 0
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br i1 %cmp, label %for.body, label %for.end
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; CHECK: for.body:
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; CHECK-NEXT: phi i32 [ 0
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; CHECK-NEXT: store i32 0
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for.body: ; preds = %for.cond
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store i32 0, i32* %arrayidx, align 16
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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%arrayidx.lcssa = phi i32* [ %arrayidx, %for.cond ]
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call void @g(i32* %arrayidx.lcssa) nounwind
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ret void
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}
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declare void @g(i32*)
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