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llvm-project/llvm/test/Transforms/LoopUnroll/unroll-unconditional-latch.ll

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; RUN: opt -loop-unroll -S %s -verify-loop-info -verify-dom-info -verify-loop-lcssa | FileCheck %s
%struct.spam = type { double, double, double, double, double, double, double }
define void @test2(i32* %arg) {
; CHECK-LABEL: void @test2
; CHECK-NEXT: entry:
; CHECK-NEXT: br label %for.header
; CHECK-LABEL: for.header: ; preds = %entry
; CHECK-NEXT: store i32 0, i32* %arg, align 4
; CHECK-NEXT: br label %for.latch
; CHECK-LABEL: for.latch: ; preds = %for.header
; CHECK-NEXT: %ptr.1 = getelementptr inbounds i32, i32* %arg, i64 1
; CHECK-NEXT: store i32 0, i32* %ptr.1, align 4
; CHECK-NEXT: br label %for.latch.1
; CHECK-LABEL: if.end.loopexit: ; preds = %for.latch.2
; CHECK-NEXT: ret void
; CHECK-LABEL: for.latch.1: ; preds = %for.latch
; CHECK-NEXT: %ptr.2 = getelementptr inbounds i32, i32* %arg, i64 2
; CHECK-NEXT: store i32 0, i32* %ptr.2, align 4
; CHECK-NEXT: br label %for.latch.2
; CHECK-LABEL: for.latch.2: ; preds = %for.latch.1
; CHECK-NEXT: %ptr.3 = getelementptr inbounds i32, i32* %arg, i64 3
; CHECK-NEXT: store i32 0, i32* %ptr.3, align 4
; CHECK-NEXT: br i1 true, label %if.end.loopexit, label %for.latch.3
; CHECK-LABEL: for.latch.3: ; preds = %for.latch.2
; CHECK-NEXT: unreachable
entry:
br label %for.header
for.header: ; preds = %for.latch, %entry
%indvars.iv800 = phi i64 [ 0, %entry ], [ %indvars.iv.next801, %for.latch ]
%ptr = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv800
store i32 0, i32* %ptr, align 4
%indvars.iv.next801 = add nuw nsw i64 %indvars.iv800, 1
%exitcond802 = icmp eq i64 %indvars.iv.next801, 4
br i1 %exitcond802, label %if.end.loopexit, label %for.latch
for.latch: ; preds = %for.header
br label %for.header
if.end.loopexit: ; preds = %for.header
ret void
}
define double @test_with_lcssa(double %arg1, double* %arg2) {
; CHECK-LABEL: define double @test_with_lcssa(
; CHECK-LABEL: entry:
; CHECK-NEXT: br label %loop.header
; CHECK-LABEL: loop.header: ; preds = %entry
; CHECK-NEXT: %res = fsub double %arg1, 3.000000e+00
; CHECK-NEXT: br label %loop.latch
; CHECK-LABEL: loop.latch: ; preds = %loop.header
; CHECK-NEXT: %ptr = getelementptr inbounds double, double* %arg2, i64 1
; CHECK-NEXT: %lv = load double, double* %ptr, align 8
; CHECK-NEXT: %res.1 = fsub double %lv, %res
; CHECK-NEXT: br i1 true, label %loop.exit, label %loop.latch.1
; CHECK-LABEL: loop.exit: ; preds = %loop.latch
; CHECK-NEXT: %res.lcssa = phi double [ %res.1, %loop.latch ]
; CHECK-NEXT: ret double %res.lcssa
; CHECK-LABEL: loop.latch.1: ; preds = %loop.latch
; CHECK-NEXT: %ptr.1 = getelementptr inbounds double, double* %arg2, i64 2
; CHECK-NEXT: unreachable
entry:
br label %loop.header
loop.header: ; preds = %entry, %loop.latch
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%d1 = phi double [ %arg1, %entry ], [ %lv, %loop.latch ]
%d2 = phi double [ 3.0, %entry ], [ %res, %loop.latch ]
%res = fsub double %d1, %d2
%iv.next = add nuw nsw i64 %iv, 1
%cond = icmp eq i64 %iv.next, 2
br i1 %cond, label %loop.exit, label %loop.latch
loop.latch: ; preds = %bb366
%ptr = getelementptr inbounds double, double* %arg2, i64 %iv.next
%lv = load double, double* %ptr, align 8
br label %loop.header
loop.exit: ; preds = %bb366
%res.lcssa = phi double [ %res, %loop.header ]
ret double %res.lcssa
}
; We unroll the outer loop and need to preserve LI for the inner loop.
define void @test_with_nested_loop(i32* %arg) {
; CHECK-LABEL: void @test_with_nested_loop
; CHECK-LABEL: entry:
; CHECK-NEXT: br label %outer.header
; CHECK-DAG: outer.header: ; preds = %entry
; CHECK-NEXT: br label %inner.body.preheader
; CHECK-DAG: inner.body.preheader: ; preds = %outer.header
; CHECK-NEXT: br label %inner.body
; CHECK-LABEL: inner.body: ; preds = %inner.body.preheader, %inner.body
; CHECK-NEXT: %j.iv = phi i64 [ %j.iv.next, %inner.body ], [ 0, %inner.body.preheader ]
; CHECK-NEXT: %ptr = getelementptr inbounds i32, i32* %arg, i64 %j.iv
; CHECK-NEXT: store i32 0, i32* %ptr, align 4
; CHECK-NEXT: %j.iv.next = add nuw nsw i64 %j.iv, 1
; CHECK-NEXT: %inner.cond = icmp eq i64 %j.iv.next, 40000
; CHECK-NEXT: br i1 %inner.cond, label %outer.latch, label %inner.body
; CHECK-LABEL: outer.latch: ; preds = %inner.body
; CHECK-NEXT: br label %inner.body.preheader.1
; CHECK-LABEL: exit: ; preds = %outer.latch.1
; CHECK-NEXT: ret void
; CHECK-LABEL: inner.body.preheader.1: ; preds = %outer.latch
; CHECK-NEXT: br label %inner.body.1
; CHECK-LABEL: inner.body.1: ; preds = %inner.body.1, %inner.body.preheader.1
; CHECK-NEXT: %j.iv.1 = phi i64 [ %j.iv.next.1, %inner.body.1 ], [ 0, %inner.body.preheader.1 ]
; CHECK-NEXT: %idx.1 = add i64 1, %j.iv.1
; CHECK-NEXT: %ptr.1 = getelementptr inbounds i32, i32* %arg, i64 %idx.1
; CHECK-NEXT: store i32 0, i32* %ptr.1, align 4
; CHECK-NEXT: %j.iv.next.1 = add nuw nsw i64 %j.iv.1, 1
; CHECK-NEXT: %inner.cond.1 = icmp eq i64 %j.iv.next.1, 40000
; CHECK-NEXT: br i1 %inner.cond.1, label %outer.latch.1, label %inner.body.1
; CHECK-LABEL: outer.latch.1: ; preds = %inner.body.1
; CHECK-NEXT: br i1 true, label %exit, label %inner.body.preheader.2
; CHECK-LABEL: inner.body.preheader.2: ; preds = %outer.latch.1
; CHECK-NEXT: br label %inner.body.2
; CHECK-LABEL: inner.body.2: ; preds = %inner.body.2, %inner.body.preheader.2
; CHECK-NEXT: %j.iv.2 = phi i64 [ %j.iv.next.2, %inner.body.2 ], [ 0, %inner.body.preheader.2 ]
; CHECK-NEXT: %idx.2 = add i64 2, %j.iv.2
; CHECK-NEXT: %ptr.2 = getelementptr inbounds i32, i32* %arg, i64 %idx.2
; CHECK-NEXT: store i32 0, i32* %ptr.2, align 4
; CHECK-NEXT: %j.iv.next.2 = add nuw nsw i64 %j.iv.2, 1
; CHECK-NEXT: %inner.cond.2 = icmp eq i64 %j.iv.next.2, 40000
; CHECK-NEXT: br i1 %inner.cond.2, label %outer.latch.2, label %inner.body.2
; CHECK-LABEL: outer.latch.2: ; preds = %inner.body.2
; CHECK-NEXT: unreachable
;
entry:
br label %outer.header
outer.header: ; preds = %outer.latch, %entry
%outer.iv = phi i64 [ 0, %entry ], [ %outer.iv.next, %outer.latch ]
%outer.iv.next = add nuw nsw i64 %outer.iv, 1
%outer.cond = icmp eq i64 %outer.iv, 2
br i1 %outer.cond, label %exit, label %inner.body
inner.body:
%j.iv = phi i64 [ 0, %outer.header ], [ %j.iv.next, %inner.body ]
%idx = add i64 %outer.iv, %j.iv
%ptr = getelementptr inbounds i32, i32* %arg, i64 %idx
store i32 0, i32* %ptr, align 4
%j.iv.next = add nuw nsw i64 %j.iv, 1
%inner.cond = icmp eq i64 %j.iv.next, 40000
br i1 %inner.cond, label %outer.latch, label %inner.body
outer.latch: ; preds = %inner.body
br label %outer.header
exit: ; preds = %outer.header
ret void
}
; We unroll the inner loop and need to preserve LI for the outer loop.
define void @test_with_nested_loop_unroll_inner(i32* %arg) {
; CHECK-LABEL: define void @test_with_nested_loop_unroll_inner(
; CHECK-LABEL: entry:
; CHECK-NEXT: br label %outer.header
; CHECK-LABEL: outer.header: ; preds = %inner.body, %entry
; CHECK-NEXT: %outer.iv = phi i64 [ 0, %entry ], [ %outer.iv.next, %inner.body ]
; CHECK-NEXT: %outer.iv.next = add nuw nsw i64 %outer.iv, 1
; CHECK-NEXT: %outer.cond = icmp eq i64 %outer.iv, 40000
; CHECK-NEXT: br i1 %outer.cond, label %exit, label %inner.body.preheader
; CHECK-LABEL: inner.body.preheader: ; preds = %outer.header
; CHECK-NEXT: br label %inner.body
; CHECK-LABEL: inner.body: ; preds = %inner.body.preheader
; CHECK-NEXT: %ptr = getelementptr inbounds i32, i32* %arg, i64 %outer.iv
; CHECK-NEXT: store i32 0, i32* %ptr, align 4
; CHECK-NEXT: %idx.1 = add i64 %outer.iv, 1
; CHECK-NEXT: %ptr.1 = getelementptr inbounds i32, i32* %arg, i64 %idx.1
; CHECK-NEXT: store i32 0, i32* %ptr.1, align 4
; CHECK-NEXT: br label %outer.header
; CHECK-LABEL: exit: ; preds = %outer.header
; CHECK-NEXT: ret void
;
entry:
br label %outer.header
outer.header: ; preds = %outer.latch, %entry
%outer.iv = phi i64 [ 0, %entry ], [ %outer.iv.next, %outer.latch ]
%outer.iv.next = add nuw nsw i64 %outer.iv, 1
%outer.cond = icmp eq i64 %outer.iv, 40000
br i1 %outer.cond, label %exit, label %inner.body
inner.body:
%j.iv = phi i64 [ 0, %outer.header ], [ %j.iv.next, %inner.body ]
%idx = add i64 %outer.iv, %j.iv
%ptr = getelementptr inbounds i32, i32* %arg, i64 %idx
store i32 0, i32* %ptr, align 4
%j.iv.next = add nuw nsw i64 %j.iv, 1
%inner.cond = icmp eq i64 %j.iv.next, 2
br i1 %inner.cond, label %outer.latch, label %inner.body
outer.latch: ; preds = %inner.body
br label %outer.header
exit: ; preds = %outer.header
ret void
}
; Check that we do not crash for headers with non-branch instructions, e.g.
; switch. We do not unroll in those cases.
define void @test_switchinst_in_header() {
; CHECK-LABEL: define void @test_switchinst_in_header() {
; CHECK-LABEL: entry:
; CHECK-NEXT: br label %while.header
; CHECK-LABEL: while.header: ; preds = %while.latch, %entry
; CHECK-NEXT: switch i32 undef, label %exit [
; CHECK-NEXT: i32 11, label %while.body1
; CHECK-NEXT: i32 5, label %while.body2
; CHECK-NEXT: ]
; CHECK-LABEL: while.body1: ; preds = %while.header
; CHECK-NEXT: unreachable
; CHECK-LABEL: while.body2: ; preds = %while.header
; CHECK-NEXT: br label %while.latch
; CHECK-LABEL: while.latch: ; preds = %while.body2
; CHECK-NEXT: br label %while.header
; CHECK-LABEL: exit: ; preds = %while.header
; CHECK-NEXT: ret void
;
entry:
br label %while.header
while.header: ; preds = %while.latch, %entry
switch i32 undef, label %exit [
i32 11, label %while.body1
i32 5, label %while.body2
]
while.body1: ; preds = %while.header
unreachable
while.body2: ; preds = %while.header
br label %while.latch
while.latch: ; preds = %while.body2
br label %while.header
exit: ; preds = %while.header
ret void
}
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