forked from OSchip/llvm-project
54 lines
1.8 KiB
LLVM
54 lines
1.8 KiB
LLVM
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; RUN: llc -O2 -tail-dup-placement-threshold=4 -o - %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: uwtable
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; When tail-duplicating during placement, we work backward from blocks with
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; multiple successors. In this case, the block dup1 gets duplicated into dup2
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; and if.then64, and then the block dup2 gets duplicated into land.lhs.true
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; and if.end70
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; CHECK-LABEL: repeated_tail_dup:
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define void @repeated_tail_dup(i1 %a1, i1 %a2, i32* %a4, i32* %a5, i8* %a6) #0 align 2 {
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entry:
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br label %for.cond
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; CHECK: {{^}}.[[HEADER:LBB0_[1-9]]]: # %for.cond
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for.cond: ; preds = %dup1, %entry
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br i1 %a1, label %land.lhs.true, label %if.end56
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land.lhs.true: ; preds = %for.cond
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store i32 10, i32* %a4, align 8
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br label %dup2
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if.end56: ; preds = %for.cond
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br i1 %a2, label %if.then64, label %if.end70
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if.then64: ; preds = %if.end56
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store i8 1, i8* %a6, align 1
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br label %dup1
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; CHECK: # %if.end70
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; CHECK-NEXT: # in Loop:
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; CHECK-NEXT: movl $12, (%rdx)
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; CHECK-NEXT: movl $2, (%rcx)
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; CHECK-NEXT: testl %eax, %eax
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; CHECK-NEXT: je .[[HEADER]]
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if.end70: ; preds = %if.end56
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store i32 12, i32* %a4, align 8
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br label %dup2
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dup2: ; preds = %if.end70, %land.lhs.true
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store i32 2, i32* %a5, align 4
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br label %dup1
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dup1: ; preds = %dup2, %if.then64
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%val = load i32, i32* %a4, align 8
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%switch = icmp ult i32 undef, 1
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br i1 %switch, label %for.cond, label %for.end
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for.end: ; preds = %dup1
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ret void
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}
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attributes #0 = { uwtable }
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