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 6target 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 18define 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 25define 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 33define 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 41define 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 49define 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 57define 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 65define 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 73define 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 82define i32 @test10(i1 %C.upgrd.1, i32* %P, i32* %Q) { 83 br i1 %C.upgrd.1, label %T, label %F 84T: ; preds = %0 85 store i32 1, i32* %Q 86 store i32 0, i32* %P 87 br label %C 88F: ; preds = %0 89 store i32 0, i32* %P 90 br label %C 91C: ; 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 98define 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 108define 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 119define <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 124define 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 143define 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 155define 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 171entry: 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 189define 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 198entry: 199 %x.load = load i8*, i8** %x 200 store i8 %y, i8* %x.load 201 202 ret void 203} 204