1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -passes=instcombine -S | FileCheck %s
4 ; Tests to verify proper functioning of the icmp folding implemented in
5 ; InstCombiner::foldICmpBitCastConstant
6 ; Specifically, folding:
8 ; where X = bitcast <M x iK> (shufflevector <M x iK> %vec, undef, SC)) to iN
9 ; and C is a splat of a K-bit pattern
10 ; and SC is a constant vector = <C', C', C', ..., C'>
12 ; %E = extractelement <M x iK> %vec, i32 C'
13 ; icmp <pred> iK %E, trunc(C)
15 define i1 @test_i1_0(i1 %val) {
16 ; CHECK-LABEL: @test_i1_0(
17 ; CHECK-NEXT: [[COND:%.*]] = xor i1 [[VAL:%.*]], true
18 ; CHECK-NEXT: ret i1 [[COND]]
20 %insvec = insertelement <4 x i1> undef, i1 %val, i32 0
21 %vec = shufflevector <4 x i1> %insvec, <4 x i1> undef, <4 x i32> zeroinitializer
22 %cast = bitcast <4 x i1> %vec to i4
23 %cond = icmp eq i4 %cast, 0
27 define i1 @test_i1_0_2(i1 %val) {
28 ; CHECK-LABEL: @test_i1_0_2(
29 ; CHECK-NEXT: [[COND:%.*]] = xor i1 [[VAL:%.*]], true
30 ; CHECK-NEXT: ret i1 [[COND]]
32 %insvec = insertelement <4 x i1> undef, i1 %val, i32 2
33 %vec = shufflevector <4 x i1> %insvec, <4 x i1> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
34 %cast = bitcast <4 x i1> %vec to i4
35 %cond = icmp eq i4 %cast, 0
39 define i1 @test_i1_m1(i1 %val) {
40 ; CHECK-LABEL: @test_i1_m1(
41 ; CHECK-NEXT: ret i1 [[VAL:%.*]]
43 %insvec = insertelement <4 x i1> undef, i1 %val, i32 0
44 %vec = shufflevector <4 x i1> %insvec, <4 x i1> undef, <4 x i32> zeroinitializer
45 %cast = bitcast <4 x i1> %vec to i4
46 %cond = icmp eq i4 %cast, -1
50 define i1 @test_i8_pattern(i8 %val) {
51 ; CHECK-LABEL: @test_i8_pattern(
52 ; CHECK-NEXT: [[COND:%.*]] = icmp eq i8 [[VAL:%.*]], 72
53 ; CHECK-NEXT: ret i1 [[COND]]
55 %insvec = insertelement <4 x i8> undef, i8 %val, i32 0
56 %vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer
57 %cast = bitcast <4 x i8> %vec to i32
58 %cond = icmp eq i32 %cast, 1212696648
62 define i1 @test_i8_pattern_2(i8 %val) {
63 ; CHECK-LABEL: @test_i8_pattern_2(
64 ; CHECK-NEXT: [[COND:%.*]] = icmp eq i8 [[VAL:%.*]], 72
65 ; CHECK-NEXT: ret i1 [[COND]]
67 %insvec = insertelement <4 x i8> undef, i8 %val, i32 2
68 %vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
69 %cast = bitcast <4 x i8> %vec to i32
70 %cond = icmp eq i32 %cast, 1212696648
74 ; Make sure we don't try to fold if the shufflemask has differing element values
75 define i1 @test_i8_pattern_3(<4 x i8> %invec) {
76 ; CHECK-LABEL: @test_i8_pattern_3(
77 ; CHECK-NEXT: [[VEC:%.*]] = shufflevector <4 x i8> [[INVEC:%.*]], <4 x i8> poison, <4 x i32> <i32 1, i32 0, i32 3, i32 2>
78 ; CHECK-NEXT: [[CAST:%.*]] = bitcast <4 x i8> [[VEC]] to i32
79 ; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[CAST]], 1212696648
80 ; CHECK-NEXT: ret i1 [[COND]]
82 %vec = shufflevector <4 x i8> %invec, <4 x i8> undef, <4 x i32> <i32 1, i32 0, i32 3, i32 2>
83 %cast = bitcast <4 x i8> %vec to i32
84 %cond = icmp eq i32 %cast, 1212696648
88 ; Make sure we don't try to fold if the compared-to constant isn't a splatted value
89 define i1 @test_i8_nopattern(i8 %val) {
90 ; CHECK-LABEL: @test_i8_nopattern(
91 ; CHECK-NEXT: [[INSVEC:%.*]] = insertelement <4 x i8> poison, i8 [[VAL:%.*]], i64 0
92 ; CHECK-NEXT: [[VEC:%.*]] = shufflevector <4 x i8> [[INSVEC]], <4 x i8> poison, <4 x i32> zeroinitializer
93 ; CHECK-NEXT: [[CAST:%.*]] = bitcast <4 x i8> [[VEC]] to i32
94 ; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[CAST]], 1212696647
95 ; CHECK-NEXT: ret i1 [[COND]]
97 %insvec = insertelement <4 x i8> undef, i8 %val, i32 0
98 %vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer
99 %cast = bitcast <4 x i8> %vec to i32
100 %cond = icmp eq i32 %cast, 1212696647
104 ; Verify that we fold more than just the eq predicate
105 define i1 @test_i8_ult_pattern(i8 %val) {
106 ; CHECK-LABEL: @test_i8_ult_pattern(
107 ; CHECK-NEXT: [[COND:%.*]] = icmp ult i8 [[VAL:%.*]], 72
108 ; CHECK-NEXT: ret i1 [[COND]]
110 %insvec = insertelement <4 x i8> undef, i8 %val, i32 0
111 %vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer
112 %cast = bitcast <4 x i8> %vec to i32
113 %cond = icmp ult i32 %cast, 1212696648
117 define i1 @extending_shuffle_with_weird_types(<2 x i9> %v) {
118 ; CHECK-LABEL: @extending_shuffle_with_weird_types(
119 ; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x i9> [[V:%.*]], i64 0
120 ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i9 [[TMP1]], 1
121 ; CHECK-NEXT: ret i1 [[CMP]]
123 %splat = shufflevector <2 x i9> %v, <2 x i9> undef, <3 x i32> zeroinitializer
124 %cast = bitcast <3 x i9> %splat to i27
125 %cmp = icmp slt i27 %cast, 262657 ; 0x040201