1 ; RUN: opt -instcombine -S < %s | FileCheck %s 2 ; RUN: opt -passes=instcombine -S < %s | FileCheck %s 3 4 ; This test makes sure that these instructions are properly eliminated. 5 6 target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128" 7 8 @X = constant i32 42 ; <i32*> [#uses=2] 9 @X2 = constant i32 47 ; <i32*> [#uses=1] 10 @Y = constant [2 x { i32, float }] [ { i32, float } { i32 12, float 1.000000e+00 }, { i32, float } { i32 37, float 0x3FF3B2FEC0000000 } ] ; <[2 x { i32, float }]*> [#uses=2] 11 @Z = constant [2 x { i32, float }] zeroinitializer ; <[2 x { i32, float }]*> [#uses=1] 12 13 @GLOBAL = internal constant [4 x i32] zeroinitializer 14 15 16 ; CHECK-LABEL: @test1( 17 ; CHECK-NOT: load 18 define i32 @test1() { 19 %B = load i32, i32* @X ; <i32> [#uses=1] 20 ret i32 %B 21 } 22 23 ; CHECK-LABEL: @test2( 24 ; CHECK-NOT: load 25 define float @test2() { 26 %A = getelementptr [2 x { i32, float }], [2 x { i32, float }]* @Y, i64 0, i64 1, i32 1 ; <float*> [#uses=1] 27 %B = load float, float* %A ; <float> [#uses=1] 28 ret float %B 29 } 30 31 ; CHECK-LABEL: @test3( 32 ; CHECK-NOT: load 33 define i32 @test3() { 34 %A = getelementptr [2 x { i32, float }], [2 x { i32, float }]* @Y, i64 0, i64 0, i32 0 ; <i32*> [#uses=1] 35 %B = load i32, i32* %A ; <i32> [#uses=1] 36 ret i32 %B 37 } 38 39 ; CHECK-LABEL: @test4( 40 ; CHECK-NOT: load 41 define i32 @test4() { 42 %A = getelementptr [2 x { i32, float }], [2 x { i32, float }]* @Z, i64 0, i64 1, i32 0 ; <i32*> [#uses=1] 43 %B = load i32, i32* %A ; <i32> [#uses=1] 44 ret i32 %B 45 } 46 47 ; CHECK-LABEL: @test5( 48 ; CHECK-NOT: load 49 define i32 @test5(i1 %C) { 50 %Y = select i1 %C, i32* @X, i32* @X2 ; <i32*> [#uses=1] 51 %Z = load i32, i32* %Y ; <i32> [#uses=1] 52 ret i32 %Z 53 } 54 55 ; CHECK-LABEL: @test7( 56 ; CHECK-NOT: load 57 define i32 @test7(i32 %X) { 58 %V = getelementptr i32, i32* null, i32 %X ; <i32*> [#uses=1] 59 %R = load i32, i32* %V ; <i32> [#uses=1] 60 ret i32 %R 61 } 62 63 ; CHECK-LABEL: @test8( 64 ; CHECK-NOT: load 65 define i32 @test8(i32* %P) { 66 store i32 1, i32* %P 67 %X = load i32, i32* %P ; <i32> [#uses=1] 68 ret i32 %X 69 } 70 71 ; CHECK-LABEL: @test9( 72 ; CHECK-NOT: load 73 define i32 @test9(i32* %P) { 74 %X = load i32, i32* %P ; <i32> [#uses=1] 75 %Y = load i32, i32* %P ; <i32> [#uses=1] 76 %Z = sub i32 %X, %Y ; <i32> [#uses=1] 77 ret i32 %Z 78 } 79 80 ; CHECK-LABEL: @test10( 81 ; CHECK-NOT: load 82 define i32 @test10(i1 %C.upgrd.1, i32* %P, i32* %Q) { 83 br i1 %C.upgrd.1, label %T, label %F 84 T: ; preds = %0 85 store i32 1, i32* %Q 86 store i32 0, i32* %P 87 br label %C 88 F: ; preds = %0 89 store i32 0, i32* %P 90 br label %C 91 C: ; preds = %F, %T 92 %V = load i32, i32* %P ; <i32> [#uses=1] 93 ret i32 %V 94 } 95 96 ; CHECK-LABEL: @test11( 97 ; CHECK-NOT: load 98 define double @test11(double* %p) { 99 %t0 = getelementptr double, double* %p, i32 1 100 store double 2.0, double* %t0 101 %t1 = getelementptr double, double* %p, i32 1 102 %x = load double, double* %t1 103 ret double %x 104 } 105 106 ; CHECK-LABEL: @test12( 107 ; CHECK-NOT: load 108 define i32 @test12(i32* %P) { 109 %A = alloca i32 110 store i32 123, i32* %A 111 ; Cast the result of the load not the source 112 %Q = bitcast i32* %A to i32* 113 %V = load i32, i32* %Q 114 ret i32 %V 115 } 116 117 ; CHECK-LABEL: @test13( 118 ; CHECK-NOT: load 119 define <16 x i8> @test13(<2 x i64> %x) { 120 %tmp = load <16 x i8>, <16 x i8>* bitcast ([4 x i32]* @GLOBAL to <16 x i8>*) 121 ret <16 x i8> %tmp 122 } 123 124 define i8 @test14(i8 %x, i32 %y) { 125 ; This test must not have the store of %x forwarded to the load -- there is an 126 ; intervening store if %y. However, the intervening store occurs with a different 127 ; type and size and to a different pointer value. This is ensuring that none of 128 ; those confuse the analysis into thinking that the second store does not alias 129 ; the first. 130 ; CHECK-LABEL: @test14( 131 ; CHECK: %[[R:.*]] = load i8, i8* 132 ; CHECK-NEXT: ret i8 %[[R]] 133 %a = alloca i32 134 %a.i8 = bitcast i32* %a to i8* 135 store i8 %x, i8* %a.i8 136 store i32 %y, i32* %a 137 %r = load i8, i8* %a.i8 138 ret i8 %r 139 } 140 141 @test15_global = external global i32 142 143 define i8 @test15(i8 %x, i32 %y) { 144 ; Same test as @test14 essentially, but using a global instead of an alloca. 145 ; CHECK-LABEL: @test15( 146 ; CHECK: %[[R:.*]] = load i8, i8* 147 ; CHECK-NEXT: ret i8 %[[R]] 148 %g.i8 = bitcast i32* @test15_global to i8* 149 store i8 %x, i8* %g.i8 150 store i32 %y, i32* @test15_global 151 %r = load i8, i8* %g.i8 152 ret i8 %r 153 } 154 155 define void @test16(i8* %x, i8* %a, i8* %b, i8* %c) { 156 ; Check that we canonicalize loads which are only stored to use integer types 157 ; when there is a valid integer type. 158 ; CHECK-LABEL: @test16( 159 ; CHECK: %[[L1:.*]] = load i32, i32* 160 ; CHECK-NOT: load 161 ; CHECK: store i32 %[[L1]], i32* 162 ; CHECK: store i32 %[[L1]], i32* 163 ; CHECK-NOT: store 164 ; CHECK: %[[L1:.*]] = load i32, i32* 165 ; CHECK-NOT: load 166 ; CHECK: store i32 %[[L1]], i32* 167 ; CHECK: store i32 %[[L1]], i32* 168 ; CHECK-NOT: store 169 ; CHECK: ret 170 171 entry: 172 %x.cast = bitcast i8* %x to float* 173 %a.cast = bitcast i8* %a to float* 174 %b.cast = bitcast i8* %b to float* 175 %c.cast = bitcast i8* %c to i32* 176 177 %x1 = load float, float* %x.cast 178 store float %x1, float* %a.cast 179 store float %x1, float* %b.cast 180 181 %x2 = load float, float* %x.cast 182 store float %x2, float* %b.cast 183 %x2.cast = bitcast float %x2 to i32 184 store i32 %x2.cast, i32* %c.cast 185 186 ret void 187 } 188 189 define void @test17(i8** %x, i8 %y) { 190 ; Check that in cases similar to @test16 we don't try to rewrite a load when 191 ; its only use is a store but it is used as the pointer to that store rather 192 ; than the value. 193 ; 194 ; CHECK-LABEL: @test17( 195 ; CHECK: %[[L:.*]] = load i8*, i8** 196 ; CHECK: store i8 %y, i8* %[[L]] 197 198 entry: 199 %x.load = load i8*, i8** %x 200 store i8 %y, i8* %x.load 201 202 ret void 203 } 204
