1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
; RUN: opt < %s -indvars -loop-deletion -S | grep phi | count 1
; XFAIL: *
; Indvars can't evaluate this loop, because ScalarEvolution can't compute
; an exact trip count, because it doesn't know if dividing by the stride will
; have a remainder. It could be done with more aggressive VRP though.
define i32 @test(i32 %x_offs) nounwind readnone {
entry:
%0 = icmp sgt i32 %x_offs, 4 ; <i1> [#uses=1]
br i1 %0, label %bb.nph, label %bb2
bb.nph: ; preds = %entry
br label %bb
bb: ; preds = %bb1, %bb.nph
%x_offs_addr.01 = phi i32 [ %1, %bb1 ], [ %x_offs, %bb.nph ] ; <i32> [#uses=1]
%1 = add i32 %x_offs_addr.01, -4 ; <i32> [#uses=3]
br label %bb1
bb1: ; preds = %bb
%2 = icmp sgt i32 %1, 4 ; <i1> [#uses=1]
br i1 %2, label %bb, label %bb1.bb2_crit_edge
bb1.bb2_crit_edge: ; preds = %bb1
br label %bb2
bb2: ; preds = %bb1.bb2_crit_edge, %entry
%x_offs_addr.0.lcssa = phi i32 [ %1, %bb1.bb2_crit_edge ], [ %x_offs, %entry ] ; <i32> [#uses=1]
ret i32 %x_offs_addr.0.lcssa
}
|
