gep-and-alias.ll
1.72 KB
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
; RUN: opt -S -basic-aa -gvn < %s | FileCheck %s
; RUN: opt -S -basic-aa -gvn -basic-aa-force-at-least-64b=0 < %s | FileCheck %s
target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
target triple = "i386-apple-macosx10.6.0"
; The load and store address in the loop body could alias so the load
; can't be hoisted above the store and out of the loop.
declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i1)
define i32 @foo(i32 %x, i32 %z, i32 %n) {
entry:
%pool = alloca [59 x i32], align 4
%tmp = bitcast [59 x i32]* %pool to i8*
call void @llvm.memset.p0i8.i32(i8* align 4 nonnull %tmp, i8 0, i32 236, i1 false)
%cmp3 = icmp eq i32 %n, 0
br i1 %cmp3, label %for.end, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
%add = add i32 %z, %x
%and = and i32 %add, 2147483647
%sub = add nsw i32 %and, -2137521902
%arrayidx = getelementptr inbounds [59 x i32], [59 x i32]* %pool, i32 0, i32 %sub
%arrayidx1 = getelementptr inbounds [59 x i32], [59 x i32]* %pool, i32 0, i32 42
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.body
%i.04 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
store i32 %i.04, i32* %arrayidx, align 4
%tmp1 = load i32, i32* %arrayidx1, align 4
%inc = add nuw i32 %i.04, 1
%exitcond = icmp ne i32 %inc, %n
br i1 %exitcond, label %for.body, label %for.end.loopexit
for.end.loopexit: ; preds = %for.body
%lcssa = phi i32 [ %tmp1, %for.body ]
br label %for.end
for.end: ; preds = %for.end.loopexit, %entry
%s = phi i32 [ 0, %entry ], [ %lcssa, %for.end.loopexit ]
; CHECK: ret i32 %s
ret i32 %s
}