tail-dup-partial.ll
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -O3 | FileCheck %s
; Function Attrs: uwtable
; When tail-duplicating during placement, we work backward from blocks with
; multiple successors. In this case, the block dup1 gets duplicated into dup2
; and if.then64, and then the block dup2 only gets duplicated into land.lhs.true.
define void @partial_tail_dup(i1 %a1, i1 %a2, i32* %a4, i32* %a5, i8* %a6, i32 %a7) #0 align 2 !prof !1 {
; CHECK-LABEL: partial_tail_dup:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: .LBB0_1: # %for.cond
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: testb $1, %dil
; CHECK-NEXT: je .LBB0_3
; CHECK-NEXT: # %bb.2: # %land.lhs.true
; CHECK-NEXT: # in Loop: Header=BB0_1 Depth=1
; CHECK-NEXT: movl $10, (%rdx)
; CHECK-NEXT: movl $2, (%rcx)
; CHECK-NEXT: testl %r9d, %r9d
; CHECK-NEXT: je .LBB0_1
; CHECK-NEXT: jmp .LBB0_8
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: .LBB0_6: # %dup2
; CHECK-NEXT: # in Loop: Header=BB0_1 Depth=1
; CHECK-NEXT: movl $2, (%rcx)
; CHECK-NEXT: testl %r9d, %r9d
; CHECK-NEXT: je .LBB0_1
; CHECK-NEXT: jmp .LBB0_8
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: .LBB0_3: # %if.end56
; CHECK-NEXT: # in Loop: Header=BB0_1 Depth=1
; CHECK-NEXT: testb $1, %sil
; CHECK-NEXT: je .LBB0_5
; CHECK-NEXT: # %bb.4: # %if.then64
; CHECK-NEXT: # in Loop: Header=BB0_1 Depth=1
; CHECK-NEXT: movb $1, (%r8)
; CHECK-NEXT: testl %r9d, %r9d
; CHECK-NEXT: je .LBB0_1
; CHECK-NEXT: jmp .LBB0_8
; CHECK-NEXT: .LBB0_5: # %if.end70
; CHECK-NEXT: # in Loop: Header=BB0_1 Depth=1
; CHECK-NEXT: movl $12, (%rdx)
; CHECK-NEXT: jne .LBB0_6
; CHECK-NEXT: .LBB0_8: # %for.end
; CHECK-NEXT: retq
entry:
br label %for.cond
for.cond:
br i1 %a1, label %land.lhs.true, label %if.end56
land.lhs.true:
store i32 10, i32* %a4, align 8
br label %dup2
if.end56:
br i1 %a2, label %if.then64, label %if.end70, !prof !2
if.then64:
store i8 1, i8* %a6, align 1
br label %dup1
if.end70:
store i32 12, i32* %a4, align 8
br i1 %a2, label %dup2, label %for.end
dup2:
store i32 2, i32* %a5, align 4
br label %dup1
dup1:
%val = load i32, i32* %a4, align 8
%switch = icmp ult i32 %a7, 1
br i1 %switch, label %for.cond, label %for.end, !prof !3
for.end:
ret void
}
attributes #0 = { uwtable }
!1 = !{!"function_entry_count", i64 2}
!2 = !{!"branch_weights", i32 5, i32 1}
!3 = !{!"branch_weights", i32 5, i32 1}