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2bc98784a8
MachineBasicBlock::canFallThrough(). We're interested in the state of the instruction (i.e., is this a barrier or not?), not if the instruction is predicable or not. rdar://10501092 llvm-svn: 149070
45 lines
2.0 KiB
LLVM
45 lines
2.0 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: 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 i8*] [i8* blockaddress(@fn, %RETURN), i8* blockaddress(@fn, %INCREMENT), i8* blockaddress(@fn, %DECREMENT)], align 4
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define i32 @fn(i32* nocapture %opcodes) nounwind readonly ssp {
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entry:
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%0 = load i32* %opcodes, align 4, !tbaa !0
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%arrayidx = getelementptr inbounds [3 x i8*]* @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* %opcodes.addr.0, align 4, !tbaa !0
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%arrayidx2 = getelementptr inbounds [3 x i8*]* @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* %opcodes.addr.0, align 4, !tbaa !0
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%arrayidx4 = getelementptr inbounds [3 x i8*]* @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 i32* [ %opcodes, %entry ], [ %opcodes.addr.0, %DECREMENT ], [ %opcodes.addr.0, %INCREMENT ]
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%indirect.goto.dest.in = phi i8** [ %arrayidx, %entry ], [ %arrayidx4, %DECREMENT ], [ %arrayidx2, %INCREMENT ]
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%opcodes.addr.0 = getelementptr inbounds i32* %opcodes.pn, i32 1
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%indirect.goto.dest = load i8** %indirect.goto.dest.in, align 4
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indirectbr i8* %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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!0 = metadata !{metadata !"int", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA", null}
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