latch-dominating-conditions.ll
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; RUN: opt -S -indvars < %s | FileCheck %s
declare void @side_effect(i1)
define void @latch_dominating_0(i8 %start) {
; CHECK-LABEL: latch_dominating_0
entry:
%e = icmp slt i8 %start, 42
br i1 %e, label %loop, label %exit
loop:
; CHECK-LABEL: loop
%idx = phi i8 [ %start, %entry ], [ %idx.inc, %be ]
%idx.inc = add i8 %idx, 1
%folds.to.true = icmp slt i8 %idx, 42
; CHECK: call void @side_effect(i1 true)
call void @side_effect(i1 %folds.to.true)
%c0 = icmp slt i8 %idx.inc, 42
br i1 %c0, label %be, label %exit
be:
; CHECK: call void @side_effect(i1 true)
call void @side_effect(i1 %folds.to.true)
%c1 = icmp slt i8 %idx.inc, 100
br i1 %c1, label %loop, label %exit
exit:
ret void
}
define void @latch_dominating_1(i8 %start) {
; CHECK-LABEL: latch_dominating_1
entry:
%e = icmp slt i8 %start, 42
br i1 %e, label %loop, label %exit
loop:
; CHECK-LABEL: loop
%idx = phi i8 [ %start, %entry ], [ %idx.inc, %be ]
%idx.inc = add i8 %idx, 1
%does.not.fold.to.true = icmp slt i8 %idx, 42
; CHECK: call void @side_effect(i1 %does.not.fold.to.true)
call void @side_effect(i1 %does.not.fold.to.true)
%c0 = icmp slt i8 %idx.inc, 42
br i1 %c0, label %be, label %be
be:
; CHECK: call void @side_effect(i1 %does.not.fold.to.true)
call void @side_effect(i1 %does.not.fold.to.true)
%c1 = icmp slt i8 %idx.inc, 100
br i1 %c1, label %loop, label %exit
exit:
ret void
}