xref: /aosp_15_r20/external/llvm/test/Transforms/GVN/pre-gep-load.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)
1*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -basicaa -gvn -enable-load-pre -S | FileCheck %s
2*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn -enable-load-pre -S | FileCheck %s
3*9880d681SAndroid Build Coastguard Worker
4*9880d681SAndroid Build Coastguard Workertarget datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
5*9880d681SAndroid Build Coastguard Workertarget triple = "aarch64--linux-gnu"
6*9880d681SAndroid Build Coastguard Worker
7*9880d681SAndroid Build Coastguard Workerdefine double @foo(i32 %stat, i32 %i, double** %p) {
8*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @foo(
9*9880d681SAndroid Build Coastguard Workerentry:
10*9880d681SAndroid Build Coastguard Worker  switch i32 %stat, label %sw.default [
11*9880d681SAndroid Build Coastguard Worker    i32 0, label %sw.bb
12*9880d681SAndroid Build Coastguard Worker    i32 1, label %sw.bb
13*9880d681SAndroid Build Coastguard Worker    i32 2, label %sw.bb2
14*9880d681SAndroid Build Coastguard Worker  ]
15*9880d681SAndroid Build Coastguard Worker
16*9880d681SAndroid Build Coastguard Workersw.bb:                                            ; preds = %entry, %entry
17*9880d681SAndroid Build Coastguard Worker  %idxprom = sext i32 %i to i64
18*9880d681SAndroid Build Coastguard Worker  %arrayidx = getelementptr inbounds double*, double** %p, i64 0
19*9880d681SAndroid Build Coastguard Worker  %0 = load double*, double** %arrayidx, align 8
20*9880d681SAndroid Build Coastguard Worker  %arrayidx1 = getelementptr inbounds double, double* %0, i64 %idxprom
21*9880d681SAndroid Build Coastguard Worker  %1 = load double, double* %arrayidx1, align 8
22*9880d681SAndroid Build Coastguard Worker  %sub = fsub double %1, 1.000000e+00
23*9880d681SAndroid Build Coastguard Worker  %cmp = fcmp olt double %sub, 0.000000e+00
24*9880d681SAndroid Build Coastguard Worker  br i1 %cmp, label %if.then, label %if.end
25*9880d681SAndroid Build Coastguard Worker
26*9880d681SAndroid Build Coastguard Workerif.then:                                          ; preds = %sw.bb
27*9880d681SAndroid Build Coastguard Worker  br label %return
28*9880d681SAndroid Build Coastguard Worker
29*9880d681SAndroid Build Coastguard Workerif.end:                                           ; preds = %sw.bb
30*9880d681SAndroid Build Coastguard Worker  br label %sw.bb2
31*9880d681SAndroid Build Coastguard Worker
32*9880d681SAndroid Build Coastguard Workersw.bb2:                                           ; preds = %if.end, %entry
33*9880d681SAndroid Build Coastguard Worker  %idxprom3 = sext i32 %i to i64
34*9880d681SAndroid Build Coastguard Worker  %arrayidx4 = getelementptr inbounds double*, double** %p, i64 0
35*9880d681SAndroid Build Coastguard Worker  %2 = load double*, double** %arrayidx4, align 8
36*9880d681SAndroid Build Coastguard Worker  %arrayidx5 = getelementptr inbounds double, double* %2, i64 %idxprom3
37*9880d681SAndroid Build Coastguard Worker  %3 = load double, double* %arrayidx5, align 8
38*9880d681SAndroid Build Coastguard Worker; CHECK: sw.bb2:
39*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: sext
40*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: phi double [
41*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: load
42*9880d681SAndroid Build Coastguard Worker  %sub6 = fsub double 3.000000e+00, %3
43*9880d681SAndroid Build Coastguard Worker  br label %return
44*9880d681SAndroid Build Coastguard Worker
45*9880d681SAndroid Build Coastguard Workersw.default:                                       ; preds = %entry
46*9880d681SAndroid Build Coastguard Worker  br label %return
47*9880d681SAndroid Build Coastguard Worker
48*9880d681SAndroid Build Coastguard Workerreturn:                                           ; preds = %sw.default, %sw.bb2, %if.then
49*9880d681SAndroid Build Coastguard Worker  %retval.0 = phi double [ 0.000000e+00, %sw.default ], [ %sub6, %sw.bb2 ], [ %sub, %if.then ]
50*9880d681SAndroid Build Coastguard Worker  ret double %retval.0
51*9880d681SAndroid Build Coastguard Worker}
52*9880d681SAndroid Build Coastguard Worker
53*9880d681SAndroid Build Coastguard Worker; The load causes the GEP's operands to be PREd earlier than normal. The
54*9880d681SAndroid Build Coastguard Worker; resulting sext ends up in pre.dest and in the GVN system before that BB is
55*9880d681SAndroid Build Coastguard Worker; actually processed. Make sure we can deal with the situation.
56*9880d681SAndroid Build Coastguard Worker
57*9880d681SAndroid Build Coastguard Workerdefine void @test_shortcut_safe(i1 %tst, i32 %p1, i32* %a) {
58*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: define void @test_shortcut_safe
59*9880d681SAndroid Build Coastguard Worker; CHECK: [[SEXT1:%.*]] = sext i32 %p1 to i64
60*9880d681SAndroid Build Coastguard Worker; CHECK: [[PHI1:%.*]] = phi i64 [ [[SEXT1]], {{%.*}} ], [ [[PHI2:%.*]], {{%.*}} ]
61*9880d681SAndroid Build Coastguard Worker; CHECK: [[SEXT2:%.*]] = sext i32 %p1 to i64
62*9880d681SAndroid Build Coastguard Worker; CHECK: [[PHI2]] = phi i64 [ [[SEXT2]], {{.*}} ], [ [[PHI1]], {{%.*}} ]
63*9880d681SAndroid Build Coastguard Worker; CHECK: getelementptr inbounds i32, i32* %a, i64 [[PHI2]]
64*9880d681SAndroid Build Coastguard Worker
65*9880d681SAndroid Build Coastguard Worker  br i1 %tst, label %sext1, label %pre.dest
66*9880d681SAndroid Build Coastguard Worker
67*9880d681SAndroid Build Coastguard Workerpre.dest:
68*9880d681SAndroid Build Coastguard Worker  br label %sext.use
69*9880d681SAndroid Build Coastguard Worker
70*9880d681SAndroid Build Coastguard Workersext1:
71*9880d681SAndroid Build Coastguard Worker  %idxprom = sext i32 %p1 to i64
72*9880d681SAndroid Build Coastguard Worker  br label %sext.use
73*9880d681SAndroid Build Coastguard Worker
74*9880d681SAndroid Build Coastguard Workersext.use:
75*9880d681SAndroid Build Coastguard Worker  %idxprom2 = sext i32 %p1 to i64
76*9880d681SAndroid Build Coastguard Worker  %arrayidx3 = getelementptr inbounds i32, i32* %a, i64 %idxprom2
77*9880d681SAndroid Build Coastguard Worker  %val = load i32, i32* %arrayidx3, align 4
78*9880d681SAndroid Build Coastguard Worker  tail call void (i32) @g(i32 %val)
79*9880d681SAndroid Build Coastguard Worker  br label %pre.dest
80*9880d681SAndroid Build Coastguard Worker}
81*9880d681SAndroid Build Coastguard Worker
82*9880d681SAndroid Build Coastguard Workerdeclare void @g(i32)
83