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
|
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
; Instcombine should be able to prove vector alignment in the
; presence of a few mild address computation tricks.
; CHECK: @test0(
; CHECK: align 16
define void @test0(i8* %b, i64 %n, i64 %u, i64 %y) nounwind {
entry:
%c = ptrtoint i8* %b to i64
%d = and i64 %c, -16
%e = inttoptr i64 %d to double*
%v = mul i64 %u, 2
%z = and i64 %y, -2
%t1421 = icmp eq i64 %n, 0
br i1 %t1421, label %return, label %bb
bb:
%i = phi i64 [ %indvar.next, %bb ], [ 20, %entry ]
%j = mul i64 %i, %v
%h = add i64 %j, %z
%t8 = getelementptr double* %e, i64 %h
%p = bitcast double* %t8 to <2 x double>*
store <2 x double><double 0.0, double 0.0>, <2 x double>* %p, align 8
%indvar.next = add i64 %i, 1
%exitcond = icmp eq i64 %indvar.next, %n
br i1 %exitcond, label %return, label %bb
return:
ret void
}
; When we see a unaligned load from an insufficiently aligned global or
; alloca, increase the alignment of the load, turning it into an aligned load.
; CHECK: @test1(
; CHECK: tmp = load
; CHECK: GLOBAL{{.*}}align 16
@GLOBAL = internal global [4 x i32] zeroinitializer
define <16 x i8> @test1(<2 x i64> %x) {
entry:
%tmp = load <16 x i8>* bitcast ([4 x i32]* @GLOBAL to <16 x i8>*), align 1
ret <16 x i8> %tmp
}
; When a load or store lacks an explicit alignment, add one.
; CHECK: @test2(
; CHECK: load double* %p, align 8
; CHECK: store double %n, double* %p, align 8
define double @test2(double* %p, double %n) nounwind {
%t = load double* %p
store double %n, double* %p
ret double %t
}
|
