1 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
2 ; RUN: llc < %s -mtriple=riscv64 | FileCheck %s
5 ; Make sure we don't emit a pair of shift for the zext in the preheader. We
6 ; can tell that bit 31 is 0 in the preheader and rely on %n already being
7 ; sign extended without adding zeros explicitly.
8 define void @test1(ptr nocapture noundef %a, i32 noundef signext %n) {
10 ; CHECK: # %bb.0: # %entry
11 ; CHECK-NEXT: blez a1, .LBB0_2
12 ; CHECK-NEXT: .LBB0_1: # %for.body
13 ; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
14 ; CHECK-NEXT: lw a2, 0(a0)
15 ; CHECK-NEXT: addi a2, a2, 4
16 ; CHECK-NEXT: sw a2, 0(a0)
17 ; CHECK-NEXT: addi a1, a1, -1
18 ; CHECK-NEXT: addi a0, a0, 4
19 ; CHECK-NEXT: bnez a1, .LBB0_1
20 ; CHECK-NEXT: .LBB0_2: # %for.cond.cleanup
23 %cmp3 = icmp sgt i32 %n, 0
24 br i1 %cmp3, label %for.body.preheader, label %for.cond.cleanup
26 for.body.preheader: ; preds = %entry
27 %wide.trip.count = zext i32 %n to i64
30 for.cond.cleanup: ; preds = %for.body, %entry
33 for.body: ; preds = %for.body.preheader, %for.body
34 %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
35 %arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
36 %0 = load i32, ptr %arrayidx, align 4
37 %add = add nsw i32 %0, 4
38 store i32 %add, ptr %arrayidx, align 4
39 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
40 %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
41 br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
44 ; Make sure we convert the 4294967294 in for.body.preheader.new to -2 based on
45 ; the upper 33 bits being zero by the dominating condition %cmp3.
46 define void @test2(ptr nocapture noundef %a, i32 noundef signext %n) {
48 ; CHECK: # %bb.0: # %entry
49 ; CHECK-NEXT: blez a1, .LBB1_7
50 ; CHECK-NEXT: # %bb.1: # %for.body.preheader
51 ; CHECK-NEXT: li a3, 1
52 ; CHECK-NEXT: andi a2, a1, 1
53 ; CHECK-NEXT: bne a1, a3, .LBB1_3
54 ; CHECK-NEXT: # %bb.2:
55 ; CHECK-NEXT: li a3, 0
56 ; CHECK-NEXT: j .LBB1_5
57 ; CHECK-NEXT: .LBB1_3: # %for.body.preheader.new
58 ; CHECK-NEXT: li a3, 0
59 ; CHECK-NEXT: andi a1, a1, -2
60 ; CHECK-NEXT: addi a4, a0, 4
61 ; CHECK-NEXT: .LBB1_4: # %for.body
62 ; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
63 ; CHECK-NEXT: lw a5, -4(a4)
64 ; CHECK-NEXT: lw a6, 0(a4)
65 ; CHECK-NEXT: addi a5, a5, 4
66 ; CHECK-NEXT: sw a5, -4(a4)
67 ; CHECK-NEXT: addi a6, a6, 4
68 ; CHECK-NEXT: sw a6, 0(a4)
69 ; CHECK-NEXT: addi a3, a3, 2
70 ; CHECK-NEXT: addi a4, a4, 8
71 ; CHECK-NEXT: bne a1, a3, .LBB1_4
72 ; CHECK-NEXT: .LBB1_5: # %for.cond.cleanup.loopexit.unr-lcssa
73 ; CHECK-NEXT: beqz a2, .LBB1_7
74 ; CHECK-NEXT: # %bb.6: # %for.body.epil
75 ; CHECK-NEXT: slli a3, a3, 2
76 ; CHECK-NEXT: add a0, a0, a3
77 ; CHECK-NEXT: lw a1, 0(a0)
78 ; CHECK-NEXT: addi a1, a1, 4
79 ; CHECK-NEXT: sw a1, 0(a0)
80 ; CHECK-NEXT: .LBB1_7: # %for.cond.cleanup
83 %cmp3 = icmp sgt i32 %n, 0
84 br i1 %cmp3, label %for.body.preheader, label %for.cond.cleanup
86 for.body.preheader: ; preds = %entry
87 %wide.trip.count = zext i32 %n to i64
88 %xtraiter = and i64 %wide.trip.count, 1
89 %0 = icmp eq i32 %n, 1
90 br i1 %0, label %for.cond.cleanup.loopexit.unr-lcssa, label %for.body.preheader.new
92 for.body.preheader.new: ; preds = %for.body.preheader
93 %unroll_iter = and i64 %wide.trip.count, 4294967294
96 for.cond.cleanup.loopexit.unr-lcssa: ; preds = %for.body, %for.body.preheader
97 %indvars.iv.unr = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next.1, %for.body ]
98 %lcmp.mod.not = icmp eq i64 %xtraiter, 0
99 br i1 %lcmp.mod.not, label %for.cond.cleanup, label %for.body.epil
101 for.body.epil: ; preds = %for.cond.cleanup.loopexit.unr-lcssa
102 %arrayidx.epil = getelementptr inbounds i32, ptr %a, i64 %indvars.iv.unr
103 %1 = load i32, ptr %arrayidx.epil, align 4
104 %add.epil = add nsw i32 %1, 4
105 store i32 %add.epil, ptr %arrayidx.epil, align 4
106 br label %for.cond.cleanup
108 for.cond.cleanup: ; preds = %for.body.epil, %for.cond.cleanup.loopexit.unr-lcssa, %entry
111 for.body: ; preds = %for.body, %for.body.preheader.new
112 %indvars.iv = phi i64 [ 0, %for.body.preheader.new ], [ %indvars.iv.next.1, %for.body ]
113 %niter = phi i64 [ 0, %for.body.preheader.new ], [ %niter.next.1, %for.body ]
114 %arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
115 %2 = load i32, ptr %arrayidx, align 4
116 %add = add nsw i32 %2, 4
117 store i32 %add, ptr %arrayidx, align 4
118 %indvars.iv.next = or i64 %indvars.iv, 1
119 %arrayidx.1 = getelementptr inbounds i32, ptr %a, i64 %indvars.iv.next
120 %3 = load i32, ptr %arrayidx.1, align 4
121 %add.1 = add nsw i32 %3, 4
122 store i32 %add.1, ptr %arrayidx.1, align 4
123 %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
124 %niter.next.1 = add i64 %niter, 2
125 %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
126 br i1 %niter.ncmp.1, label %for.cond.cleanup.loopexit.unr-lcssa, label %for.body