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; RUN: llc -O2 < %s | FileCheck %s
target triple = "powerpc64le-grtev4-linux-gnu"
; No duplication of loop header into entry block.
define void @no_duplicate1(i64 %a) {
; CHECK-LABEL: no_duplicate1
; CHECK: mr 30, 3
; CHECK-NEXT: b .LBB0_2
; CHECK: .LBB0_2:
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: cmpldi 30, 100
; CHECK-NEXT: bne 0, .LBB0_1
entry:
br label %header
header:
%ind = phi i64 [%a, %entry], [%val3, %latch]
%cond1 = icmp eq i64 %ind, 100
br i1 %cond1, label %middle, label %latch
middle:
%condx = call i1 @foo()
%val1 = xor i64 %ind, 2
br label %latch
latch:
%val2 = phi i64 [%ind, %header], [%val1, %middle]
%val3 = add i64 %val2, 1
%cond2 = call i1 @foo()
br i1 %cond2, label %end, label %header
end:
ret void
}
; No duplication of loop header into latches.
define void @no_duplicate2(i64 %a) {
; CHECK-LABEL: no_duplicate2
; CHECK: mr 30, 3
; CHECK-NEXT: b .LBB1_2
; CHECK: .LBB1_2:
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: cmpldi 30, 100
; CHECK-NEXT: bne 0, .LBB1_1
; CHECK: %latch2
; CHECK: b .LBB1_2
; CHECK: %latch3
; CHECK: b .LBB1_2
entry:
br label %header
header:
%ind = phi i64 [%a, %entry], [%val1, %latch1], [%val2, %latch2], [%val2, %latch3]
%cond1 = icmp eq i64 %ind, 100
br i1 %cond1, label %middle1, label %latch1
latch1:
%cond2 = call i1 @foo()
%val1 = xor i64 %ind, 2
br i1 %cond2, label %end, label %header
middle1:
%cond3 = call i1 @foo()
br i1 %cond3, label %latch1, label %middle2
middle2:
%cond4 = call i1 @foo()
%val2 = add i64 %ind, 1
br i1 %cond4, label %latch2, label %latch3
latch2:
call void @a()
br label %header
latch3:
call void @b()
br label %header
end:
ret void
}
declare i1 @foo()
declare void @a()
declare void @b()
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