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comparison test/Transforms/SROA/slice-width.ll @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
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children afa8332a0e37
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34:e874dbf0ad9d 77:54457678186b
1 ; RUN: opt < %s -sroa -S | FileCheck %s
2 target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-f80:128-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
3
4 declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
5 declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
6
7 define void @no_split_on_non_byte_width(i32) {
8 ; This tests that allocas are not split into slices that are not byte width multiple
9 %arg = alloca i32 , align 8
10 store i32 %0, i32* %arg
11 br label %load_i32
12
13 load_i32:
14 ; CHECK-LABEL: load_i32:
15 ; CHECK-NOT: bitcast {{.*}} to i1
16 ; CHECK-NOT: zext i1
17 %r0 = load i32* %arg
18 br label %load_i1
19
20 load_i1:
21 ; CHECK-LABEL: load_i1:
22 ; CHECK: bitcast {{.*}} to i1
23 %p1 = bitcast i32* %arg to i1*
24 %t1 = load i1* %p1
25 ret void
26 }
27
28 ; PR18726: Check that we use memcpy and memset to fill out padding when we have
29 ; a slice with a simple single type whose store size is smaller than the slice
30 ; size.
31
32 %union.Foo = type { x86_fp80, i64, i64 }
33
34 @foo_copy_source = external constant %union.Foo
35 @i64_sink = global i64 0
36
37 define void @memcpy_fp80_padding() {
38 %x = alloca %union.Foo
39
40 ; Copy from a global.
41 %x_i8 = bitcast %union.Foo* %x to i8*
42 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %x_i8, i8* bitcast (%union.Foo* @foo_copy_source to i8*), i32 32, i32 16, i1 false)
43
44 ; Access a slice of the alloca to trigger SROA.
45 %mid_p = getelementptr %union.Foo* %x, i32 0, i32 1
46 %elt = load i64* %mid_p
47 store i64 %elt, i64* @i64_sink
48 ret void
49 }
50 ; CHECK-LABEL: define void @memcpy_fp80_padding
51 ; CHECK: alloca x86_fp80
52 ; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32
53 ; CHECK: load i64* getelementptr inbounds (%union.Foo* @foo_copy_source, i64 0, i32 1)
54 ; CHECK: load i64* getelementptr inbounds (%union.Foo* @foo_copy_source, i64 0, i32 2)
55
56 define void @memset_fp80_padding() {
57 %x = alloca %union.Foo
58
59 ; Set to all ones.
60 %x_i8 = bitcast %union.Foo* %x to i8*
61 call void @llvm.memset.p0i8.i32(i8* %x_i8, i8 -1, i32 32, i32 16, i1 false)
62
63 ; Access a slice of the alloca to trigger SROA.
64 %mid_p = getelementptr %union.Foo* %x, i32 0, i32 1
65 %elt = load i64* %mid_p
66 store i64 %elt, i64* @i64_sink
67 ret void
68 }
69 ; CHECK-LABEL: define void @memset_fp80_padding
70 ; CHECK: alloca x86_fp80
71 ; CHECK: call void @llvm.memset.p0i8.i32(i8* %{{.*}}, i8 -1, i32 16, i32 16, i1 false)
72 ; CHECK: store i64 -1, i64* @i64_sink
73
74 %S.vec3float = type { float, float, float }
75 %U.vec3float = type { <4 x float> }
76
77 declare i32 @memcpy_vec3float_helper(%S.vec3float*)
78
79 define i32 @memcpy_vec3float_widening(%S.vec3float* %x) {
80 ; CHECK-LABEL: @memcpy_vec3float_widening(
81 ; PR18726: Check that SROA does not rewrite a 12-byte memcpy into a 16-byte
82 ; vector store, hence accidentally putting gibberish onto the stack.
83 entry:
84 ; Create a temporary variable %tmp1 and copy %x[0] into it
85 %tmp1 = alloca %S.vec3float, align 4
86 %0 = bitcast %S.vec3float* %tmp1 to i8*
87 %1 = bitcast %S.vec3float* %x to i8*
88 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %0, i8* %1, i32 12, i32 4, i1 false)
89
90 ; The following block does nothing; but appears to confuse SROA
91 %unused1 = bitcast %S.vec3float* %tmp1 to %U.vec3float*
92 %unused2 = getelementptr inbounds %U.vec3float* %unused1, i32 0, i32 0
93 %unused3 = load <4 x float>* %unused2, align 1
94
95 ; Create a second temporary and copy %tmp1 into it
96 %tmp2 = alloca %S.vec3float, align 4
97 %2 = bitcast %S.vec3float* %tmp2 to i8*
98 %3 = bitcast %S.vec3float* %tmp1 to i8*
99 ; CHECK: alloca
100 ; CHECK-NOT: store <4 x float>
101 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %2, i8* %3, i32 12, i32 4, i1 false)
102
103 %result = call i32 @memcpy_vec3float_helper(%S.vec3float* %tmp2)
104 ret i32 %result
105 ; CHECK: ret i32 %result
106 }