1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
3
4; This test comes from PR27136
5; We should hoist loop constant invariant
6
7define zeroext i1 @search(i32 %needle, i32* nocapture readonly %haystack, i32 %count) {
8; CHECK-LABEL: search:
9; CHECK:       ## BB#0: ## %entry
10; CHECK-NEXT:    testl %edx, %edx
11; CHECK-NEXT:    jle LBB0_1
12; CHECK-NEXT:  ## BB#4: ## %for.body.preheader
13; CHECK-NEXT:    movslq %edx, %rax
14; CHECK-NEXT:    xorl %ecx, %ecx
15; CHECK-NEXT:    .p2align 4, 0x90
16; CHECK-NEXT:  LBB0_5: ## %for.body
17; CHECK-NEXT:    ## =>This Inner Loop Header: Depth=1
18; CHECK-NEXT:    cmpl %edi, (%rsi,%rcx,4)
19; CHECK-NEXT:    je LBB0_6
20; CHECK-NEXT:  ## BB#2: ## %for.cond
21; CHECK-NEXT:    ## in Loop: Header=BB0_5 Depth=1
22; CHECK-NEXT:    incq %rcx
23; CHECK-NEXT:    cmpq %rax, %rcx
24; CHECK-NEXT:    jl LBB0_5
25;            ### FIXME: BB#3 and LBB0_1 should be merged
26; CHECK-NEXT:  ## BB#3:
27; CHECK-NEXT:    xorl %eax, %eax
28; CHECK-NEXT:    ## kill: %AL<def> %AL<kill> %EAX<kill>
29; CHECK-NEXT:    retq
30; CHECK-NEXT:  LBB0_1:
31; CHECK-NEXT:    xorl %eax, %eax
32; CHECK-NEXT:    ## kill: %AL<def> %AL<kill> %EAX<kill>
33; CHECK-NEXT:    retq
34; CHECK-NEXT:  LBB0_6:
35; CHECK-NEXT:    movb $1, %al
36; CHECK-NEXT:    ## kill: %AL<def> %AL<kill> %EAX<kill>
37; CHECK-NEXT:    retq
38;
39entry:
40  %cmp5 = icmp sgt i32 %count, 0
41  br i1 %cmp5, label %for.body.preheader, label %cleanup
42
43for.body.preheader:                               ; preds = %entry
44  %0 = sext i32 %count to i64
45  br label %for.body
46
47for.cond:                                         ; preds = %for.body
48  %cmp = icmp slt i64 %indvars.iv.next, %0
49  br i1 %cmp, label %for.body, label %cleanup.loopexit
50
51for.body:                                         ; preds = %for.body.preheader, %for.cond
52  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.cond ]
53  %arrayidx = getelementptr inbounds i32, i32* %haystack, i64 %indvars.iv
54  %1 = load i32, i32* %arrayidx, align 4
55  %cmp1 = icmp eq i32 %1, %needle
56  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
57  br i1 %cmp1, label %cleanup.loopexit, label %for.cond
58
59cleanup.loopexit:                                 ; preds = %for.cond, %for.body
60  %.ph = phi i1 [ false, %for.cond ], [ true, %for.body ]
61  br label %cleanup
62
63cleanup:                                          ; preds = %cleanup.loopexit, %entry
64  %2 = phi i1 [ false, %entry ], [ %.ph, %cleanup.loopexit ]
65  ret i1 %2
66}
67