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comparison test/CodeGen/X86/load-slice.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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-1:000000000000 0:95c75e76d11b
1 ; RUN: llc -mtriple x86_64-apple-macosx -mcpu=corei7-avx -combiner-stress-load-slicing < %s -o - | FileCheck %s --check-prefix=STRESS
2 ; RUN: llc -mtriple x86_64-apple-macosx -mcpu=corei7-avx < %s -o - | FileCheck %s --check-prefix=REGULAR
3 ;
4 ; <rdar://problem/14477220>
5
6 %class.Complex = type { float, float }
7
8
9 ; Check that independant slices leads to independant loads then the slices leads to
10 ; different register file.
11 ;
12 ; The layout is:
13 ; LSB 0 1 2 3 | 4 5 6 7 MSB
14 ; Low High
15 ; The base address points to 0 and is 8-bytes aligned.
16 ; Low slice starts at 0 (base) and is 8-bytes aligned.
17 ; High slice starts at 4 (base + 4-bytes) and is 4-bytes aligned.
18 ;
19 ; STRESS-LABEL: t1:
20 ; Load out[out_start + 8].real, this is base + 8 * 8 + 0.
21 ; STRESS: vmovss 64([[BASE:[^(]+]]), [[OUT_Real:%xmm[0-9]+]]
22 ; Add low slice: out[out_start].real, this is base + 0.
23 ; STRESS-NEXT: vaddss ([[BASE]]), [[OUT_Real]], [[RES_Real:%xmm[0-9]+]]
24 ; Load out[out_start + 8].imm, this is base + 8 * 8 + 4.
25 ; STRESS-NEXT: vmovss 68([[BASE]]), [[OUT_Imm:%xmm[0-9]+]]
26 ; Add high slice: out[out_start].imm, this is base + 4.
27 ; STRESS-NEXT: vaddss 4([[BASE]]), [[OUT_Imm]], [[RES_Imm:%xmm[0-9]+]]
28 ; Swap Imm and Real.
29 ; STRESS-NEXT: vinsertps $16, [[RES_Imm]], [[RES_Real]], [[RES_Vec:%xmm[0-9]+]]
30 ; Put the results back into out[out_start].
31 ; STRESS-NEXT: vmovq [[RES_Vec]], ([[BASE]])
32 ;
33 ; Same for REGULAR, we eliminate register bank copy with each slices.
34 ; REGULAR-LABEL: t1:
35 ; Load out[out_start + 8].real, this is base + 8 * 8 + 0.
36 ; REGULAR: vmovss 64([[BASE:[^)]+]]), [[OUT_Real:%xmm[0-9]+]]
37 ; Add low slice: out[out_start].real, this is base + 0.
38 ; REGULAR-NEXT: vaddss ([[BASE]]), [[OUT_Real]], [[RES_Real:%xmm[0-9]+]]
39 ; Load out[out_start + 8].imm, this is base + 8 * 8 + 4.
40 ; REGULAR-NEXT: vmovss 68([[BASE]]), [[OUT_Imm:%xmm[0-9]+]]
41 ; Add high slice: out[out_start].imm, this is base + 4.
42 ; REGULAR-NEXT: vaddss 4([[BASE]]), [[OUT_Imm]], [[RES_Imm:%xmm[0-9]+]]
43 ; Swap Imm and Real.
44 ; REGULAR-NEXT: vinsertps $16, [[RES_Imm]], [[RES_Real]], [[RES_Vec:%xmm[0-9]+]]
45 ; Put the results back into out[out_start].
46 ; REGULAR-NEXT: vmovq [[RES_Vec]], ([[BASE]])
47 define void @t1(%class.Complex* nocapture %out, i64 %out_start) {
48 entry:
49 %arrayidx = getelementptr inbounds %class.Complex* %out, i64 %out_start
50 %tmp = bitcast %class.Complex* %arrayidx to i64*
51 %tmp1 = load i64* %tmp, align 8
52 %t0.sroa.0.0.extract.trunc = trunc i64 %tmp1 to i32
53 %tmp2 = bitcast i32 %t0.sroa.0.0.extract.trunc to float
54 %t0.sroa.2.0.extract.shift = lshr i64 %tmp1, 32
55 %t0.sroa.2.0.extract.trunc = trunc i64 %t0.sroa.2.0.extract.shift to i32
56 %tmp3 = bitcast i32 %t0.sroa.2.0.extract.trunc to float
57 %add = add i64 %out_start, 8
58 %arrayidx2 = getelementptr inbounds %class.Complex* %out, i64 %add
59 %i.i = getelementptr inbounds %class.Complex* %arrayidx2, i64 0, i32 0
60 %tmp4 = load float* %i.i, align 4
61 %add.i = fadd float %tmp4, %tmp2
62 %retval.sroa.0.0.vec.insert.i = insertelement <2 x float> undef, float %add.i, i32 0
63 %r.i = getelementptr inbounds %class.Complex* %arrayidx2, i64 0, i32 1
64 %tmp5 = load float* %r.i, align 4
65 %add5.i = fadd float %tmp5, %tmp3
66 %retval.sroa.0.4.vec.insert.i = insertelement <2 x float> %retval.sroa.0.0.vec.insert.i, float %add5.i, i32 1
67 %ref.tmp.sroa.0.0.cast = bitcast %class.Complex* %arrayidx to <2 x float>*
68 store <2 x float> %retval.sroa.0.4.vec.insert.i, <2 x float>* %ref.tmp.sroa.0.0.cast, align 4
69 ret void
70 }
71
72 ; Function Attrs: nounwind
73 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #1
74
75 ; Function Attrs: nounwind
76 declare void @llvm.lifetime.start(i64, i8* nocapture)
77
78 ; Function Attrs: nounwind
79 declare void @llvm.lifetime.end(i64, i8* nocapture)
80
81 ; Check that we do not read outside of the chunk of bits of the original loads.
82 ;
83 ; The 64-bits should have been split in one 32-bits and one 16-bits slices.
84 ; The 16-bits should be zero extended to match the final type.
85 ;
86 ; The memory layout is:
87 ; LSB 0 1 2 3 | 4 5 | 6 7 MSB
88 ; Low High
89 ; The base address points to 0 and is 8-bytes aligned.
90 ; Low slice starts at 0 (base) and is 8-bytes aligned.
91 ; High slice starts at 6 (base + 6-bytes) and is 2-bytes aligned.
92 ;
93 ; STRESS-LABEL: t2:
94 ; STRESS: movzwl 6([[BASE:[^)]+]]), %eax
95 ; STRESS-NEXT: addl ([[BASE]]), %eax
96 ; STRESS-NEXT: ret
97 ;
98 ; For the REGULAR heuristic, this is not profitable to slice things that are not
99 ; next to each other in memory. Here we have a hole with bytes #4-5.
100 ; REGULAR-LABEL: t2:
101 ; REGULAR: shrq $48
102 define i32 @t2(%class.Complex* nocapture %out, i64 %out_start) {
103 %arrayidx = getelementptr inbounds %class.Complex* %out, i64 %out_start
104 %bitcast = bitcast %class.Complex* %arrayidx to i64*
105 %chunk64 = load i64* %bitcast, align 8
106 %slice32_low = trunc i64 %chunk64 to i32
107 %shift48 = lshr i64 %chunk64, 48
108 %slice32_high = trunc i64 %shift48 to i32
109 %res = add i32 %slice32_high, %slice32_low
110 ret i32 %res
111 }
112
113 ; Check that we do not optimize overlapping slices.
114 ;
115 ; The 64-bits should NOT have been split in as slices are overlapping.
116 ; First slice uses bytes numbered 0 to 3.
117 ; Second slice uses bytes numbered 6 and 7.
118 ; Third slice uses bytes numbered 4 to 7.
119 ;
120 ; STRESS-LABEL: t3:
121 ; STRESS: shrq $48
122 ; STRESS: shrq $32
123 ;
124 ; REGULAR-LABEL: t3:
125 ; REGULAR: shrq $48
126 ; REGULAR: shrq $32
127 define i32 @t3(%class.Complex* nocapture %out, i64 %out_start) {
128 %arrayidx = getelementptr inbounds %class.Complex* %out, i64 %out_start
129 %bitcast = bitcast %class.Complex* %arrayidx to i64*
130 %chunk64 = load i64* %bitcast, align 8
131 %slice32_low = trunc i64 %chunk64 to i32
132 %shift48 = lshr i64 %chunk64, 48
133 %slice32_high = trunc i64 %shift48 to i32
134 %shift32 = lshr i64 %chunk64, 32
135 %slice32_lowhigh = trunc i64 %shift32 to i32
136 %tmpres = add i32 %slice32_high, %slice32_low
137 %res = add i32 %slice32_lowhigh, %tmpres
138 ret i32 %res
139 }