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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
; Check that assume is propagated backwards through all
; operations that are `isGuaranteedToTransferExecutionToSuccessor`
; (it should reach the load and mark it as `align 32`).
define i32 @assume_inevitable(ptr %a, ptr %b, ptr %c) {
; CHECK-LABEL: @assume_inevitable(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[M:%.*]] = alloca i64, align 8
; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[A:%.*]], align 32
; CHECK-NEXT: [[LOADRES:%.*]] = load i32, ptr [[B:%.*]], align 4
; CHECK-NEXT: [[LOADRES2:%.*]] = call i32 @llvm.annotation.i32.p0(i32 [[LOADRES]], ptr nonnull @.str, ptr nonnull @.str1, i32 2)
; CHECK-NEXT: store i32 [[LOADRES2]], ptr [[A]], align 32
; CHECK-NEXT: [[DUMMY_EQ:%.*]] = icmp ugt i32 [[LOADRES]], 42
; CHECK-NEXT: tail call void @llvm.assume(i1 [[DUMMY_EQ]])
; CHECK-NEXT: [[M_A:%.*]] = call ptr @llvm.ptr.annotation.p0.p0(ptr nonnull [[M]], ptr nonnull @.str, ptr nonnull @.str1, i32 2, ptr null)
; CHECK-NEXT: [[OBJSZ:%.*]] = call i64 @llvm.objectsize.i64.p0(ptr [[C:%.*]], i1 false, i1 false, i1 false)
; CHECK-NEXT: store i64 [[OBJSZ]], ptr [[M_A]], align 4
; CHECK-NEXT: [[PTRINT:%.*]] = ptrtoint ptr [[A]] to i64
; CHECK-NEXT: [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 31
; CHECK-NEXT: [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
; CHECK-NEXT: tail call void @llvm.assume(i1 [[MASKCOND]])
; CHECK-NEXT: ret i32 [[TMP0]]
;
entry:
%dummy = alloca i8, align 4
%m = alloca i64
%0 = load i32, ptr %a, align 4
; START perform a bunch of inevitable operations
%loadres = load i32, ptr %b
%loadres2 = call i32 @llvm.annotation.i32(i32 %loadres, ptr @.str, ptr @.str1, i32 2)
store i32 %loadres2, ptr %a
%dummy_eq = icmp ugt i32 %loadres, 42
tail call void @llvm.assume(i1 %dummy_eq)
call void @llvm.lifetime.start.p0(i64 1, ptr %dummy)
%i = call ptr @llvm.invariant.start.p0(i64 1, ptr %dummy)
call void @llvm.invariant.end.p0(ptr %i, i64 1, ptr %dummy)
call void @llvm.lifetime.end.p0(i64 1, ptr %dummy)
%m_a = call ptr @llvm.ptr.annotation.p0(ptr %m, ptr @.str, ptr @.str1, i32 2, ptr null)
%objsz = call i64 @llvm.objectsize.i64.p0(ptr %c, i1 false)
store i64 %objsz, ptr %m_a
; END perform a bunch of inevitable operations
; AND here's the assume:
%ptrint = ptrtoint ptr %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
ret i32 %0
}
@.str = private unnamed_addr constant [4 x i8] c"sth\00", section "llvm.metadata"
@.str1 = private unnamed_addr constant [4 x i8] c"t.c\00", section "llvm.metadata"
declare i64 @llvm.objectsize.i64.p0(ptr, i1)
declare i32 @llvm.annotation.i32(i32, ptr, ptr, i32)
declare ptr @llvm.ptr.annotation.p0(ptr, ptr, ptr, i32, ptr)
declare void @llvm.lifetime.start.p0(i64, ptr nocapture)
declare void @llvm.lifetime.end.p0(i64, ptr nocapture)
declare ptr @llvm.invariant.start.p0(i64, ptr nocapture)
declare void @llvm.invariant.end.p0(ptr, i64, ptr nocapture)
declare void @llvm.assume(i1)
|
