1 ; RUN: llc -O3 -o - %s | FileCheck %s 2 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 3 target triple = "x86_64-unknown-linux-gnu" 4 5 ; Function Attrs: uwtable 6 ; When tail-duplicating during placement, we work backward from blocks with 7 ; multiple successors. In this case, the block dup1 gets duplicated into dup2 8 ; and if.then64, and then the block dup2 gets duplicated into land.lhs.true 9 ; and if.end70 10 ; CHECK-LABEL: repeated_tail_dup: 11 define void @repeated_tail_dup(i1 %a1, i1 %a2, i32* %a4, i32* %a5, i8* %a6) #0 align 2 { 12 entry: 13 br label %for.cond 14 15 ; CHECK: {{^}}.[[HEADER:LBB0_[1-9]]]: # %for.cond 16 for.cond: ; preds = %dup1, %entry 17 br i1 %a1, label %land.lhs.true, label %if.end56 18 19 land.lhs.true: ; preds = %for.cond 20 store i32 10, i32* %a4, align 8 21 br label %dup2 22 23 if.end56: ; preds = %for.cond 24 br i1 %a2, label %if.then64, label %if.end70 25 26 if.then64: ; preds = %if.end56 27 store i8 1, i8* %a6, align 1 28 br label %dup1 29 30 ; CHECK: # %if.end70 31 ; CHECK-NEXT: # in Loop: 32 ; CHECK-NEXT: movl $12, (%rdx) 33 ; CHECK-NEXT: movl $2, (%rcx) 34 ; CHECK-NEXT: testl %eax, %eax 35 ; CHECK-NEXT: je .[[HEADER]] 36 if.end70: ; preds = %if.end56 37 store i32 12, i32* %a4, align 8 38 br label %dup2 39 40 dup2: ; preds = %if.end70, %land.lhs.true 41 store i32 2, i32* %a5, align 4 42 br label %dup1 43 44 dup1: ; preds = %dup2, %if.then64 45 %val = load i32, i32* %a4, align 8 46 %switch = icmp ult i32 undef, 1 47 br i1 %switch, label %for.cond, label %for.end 48 49 for.end: ; preds = %dup1 50 ret void 51 } 52 53 attributes #0 = { uwtable } 54
