derek.holloway
7502bf64a4
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41 lines
1.9 KiB
LLVM
41 lines
1.9 KiB
LLVM
; RUN: llc < %s -mtriple=thumb-apple-darwin -relocation-model=dynamic-no-pic -mcpu=cortex-a8 -asm-verbose=false | FileCheck %s
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; We should be able to tail-duplicate the basic block containing the indirectbr
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; into all of its predecessors.
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; CHECK-LABEL: fn:
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; CHECK: mov pc
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; CHECK: mov pc
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; CHECK: mov pc
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@fn.codetable = internal unnamed_addr constant [3 x ptr] [ptr blockaddress(@fn, %RETURN), ptr blockaddress(@fn, %INCREMENT), ptr blockaddress(@fn, %DECREMENT)], align 4
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define i32 @fn(ptr nocapture %opcodes) nounwind readonly ssp {
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entry:
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%0 = load i32, ptr %opcodes, align 4
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%arrayidx = getelementptr inbounds [3 x ptr], ptr @fn.codetable, i32 0, i32 %0
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br label %indirectgoto
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INCREMENT: ; preds = %indirectgoto
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%inc = add nsw i32 %result.0, 1
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%1 = load i32, ptr %opcodes.addr.0, align 4
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%arrayidx2 = getelementptr inbounds [3 x ptr], ptr @fn.codetable, i32 0, i32 %1
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br label %indirectgoto
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DECREMENT: ; preds = %indirectgoto
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%dec = add nsw i32 %result.0, -1
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%2 = load i32, ptr %opcodes.addr.0, align 4
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%arrayidx4 = getelementptr inbounds [3 x ptr], ptr @fn.codetable, i32 0, i32 %2
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br label %indirectgoto
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indirectgoto: ; preds = %DECREMENT, %INCREMENT, %entry
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%result.0 = phi i32 [ 0, %entry ], [ %dec, %DECREMENT ], [ %inc, %INCREMENT ]
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%opcodes.pn = phi ptr [ %opcodes, %entry ], [ %opcodes.addr.0, %DECREMENT ], [ %opcodes.addr.0, %INCREMENT ]
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%indirect.goto.dest.in = phi ptr [ %arrayidx, %entry ], [ %arrayidx4, %DECREMENT ], [ %arrayidx2, %INCREMENT ]
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%opcodes.addr.0 = getelementptr inbounds i32, ptr %opcodes.pn, i32 1
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%indirect.goto.dest = load ptr, ptr %indirect.goto.dest.in, align 4
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indirectbr ptr %indirect.goto.dest, [label %RETURN, label %INCREMENT, label %DECREMENT]
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RETURN: ; preds = %indirectgoto
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ret i32 %result.0
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}
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