1 ; RUN: opt -S -jump-threading -dce < %s | FileCheck %s
2 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
3 target triple = "x86_64-unknown-linux-gnu"
5 ; Function Attrs: nounwind uwtable
6 define i32 @test1(i32 %a, i32 %b) #0 {
8 %cmp = icmp sgt i32 %a, 5
9 tail call void @llvm.assume(i1 %cmp)
10 %cmp1 = icmp sgt i32 %b, 1234
11 br i1 %cmp1, label %if.then, label %if.else
14 ; CHECK: icmp sgt i32 %a, 5
15 ; CHECK: call void @llvm.assume
16 ; CHECK-NOT: icmp sgt i32 %a, 3
19 if.then: ; preds = %entry
20 %cmp2 = icmp sgt i32 %a, 3
21 br i1 %cmp2, label %if.then3, label %return
23 if.then3: ; preds = %if.then
24 tail call void (...) @bar() #1
27 if.else: ; preds = %entry
28 tail call void (...) @car() #1
31 return: ; preds = %if.else, %if.then, %if.then3
32 %retval.0 = phi i32 [ 1, %if.then3 ], [ 0, %if.then ], [ 0, %if.else ]
36 define i32 @test2(i32 %a) #0 {
38 %cmp = icmp sgt i32 %a, 5
39 tail call void @llvm.assume(i1 %cmp)
40 %cmp1 = icmp sgt i32 %a, 3
41 br i1 %cmp1, label %if.then, label %return
44 ; CHECK: icmp sgt i32 %a, 5
45 ; CHECK: tail call void @llvm.assume
46 ; CHECK: tail call void (...) @bar()
50 if.then: ; preds = %entry
51 tail call void (...) @bar() #1
54 return: ; preds = %entry, %if.then
55 %retval.0 = phi i32 [ 1, %if.then ], [ 0, %entry ]
59 @g = external global i32
61 ; Check that we do prove a fact using an assume within the block.
62 ; FIXME: We can fold the assume based on the semantics of assume.
63 ; CHECK-LABEL: @can_fold_assume
64 ; CHECK: %notnull = icmp ne i32* %array, null
65 ; CHECK-NEXT: call void @llvm.assume(i1 %notnull)
66 ; CHECK-NEXT: ret void
67 define void @can_fold_assume(i32* %array) {
68 %notnull = icmp ne i32* %array, null
69 call void @llvm.assume(i1 %notnull)
70 br i1 %notnull, label %normal, label %error
76 store atomic i32 0, i32* @g unordered, align 4
82 ; We can fold the assume but not the uses before the assume.
83 define void @dont_fold_incorrectly(i32* %array) {
84 ; CHECK-LABEL:@dont_fold_incorrectly
85 ; CHECK: @f(i1 %notnull)
87 ; CHECK-NEXT: assume(i1 %notnull)
88 ; CHECK-NEXT: ret void
89 %notnull = icmp ne i32* %array, null
90 call void @f(i1 %notnull)
92 call void @llvm.assume(i1 %notnull)
93 br i1 %notnull, label %normal, label %error
99 store atomic i32 0, i32* @g unordered, align 4
103 ; Function Attrs: nounwind
104 declare void @llvm.assume(i1) #1
106 declare void @bar(...)
108 declare void @car(...)
110 attributes #0 = { nounwind uwtable }
111 attributes #1 = { nounwind }