1 ; Tests to make sure elimination of casts is working correctly 2 ; RUN: opt < %s -instcombine -S | FileCheck %s 3 4 target datalayout = "p:32:32-p1:32:32-p2:16:16" 5 6 ; This shouldn't convert to getelementptr because the relationship 7 ; between the arithmetic and the layout of allocated memory is 8 ; entirely unknown. 9 ; CHECK-LABEL: @test1( 10 ; CHECK: ptrtoint 11 ; CHECK: add 12 ; CHECK: inttoptr 13 define i8* @test1(i8* %t) { 14 %tmpc = ptrtoint i8* %t to i32 ; <i32> [#uses=1] 15 %tmpa = add i32 %tmpc, 32 ; <i32> [#uses=1] 16 %tv = inttoptr i32 %tmpa to i8* ; <i8*> [#uses=1] 17 ret i8* %tv 18 } 19 20 ; These casts should be folded away. 21 ; CHECK-LABEL: @test2( 22 ; CHECK: icmp eq i8* %a, %b 23 define i1 @test2(i8* %a, i8* %b) { 24 %tmpa = ptrtoint i8* %a to i32 ; <i32> [#uses=1] 25 %tmpb = ptrtoint i8* %b to i32 ; <i32> [#uses=1] 26 %r = icmp eq i32 %tmpa, %tmpb ; <i1> [#uses=1] 27 ret i1 %r 28 } 29 30 ; These casts should be folded away. 31 ; CHECK-LABEL: @test2_as2_same_int( 32 ; CHECK: icmp eq i8 addrspace(2)* %a, %b 33 define i1 @test2_as2_same_int(i8 addrspace(2)* %a, i8 addrspace(2)* %b) { 34 %tmpa = ptrtoint i8 addrspace(2)* %a to i16 35 %tmpb = ptrtoint i8 addrspace(2)* %b to i16 36 %r = icmp eq i16 %tmpa, %tmpb 37 ret i1 %r 38 } 39 40 ; These casts should be folded away. 41 ; CHECK-LABEL: @test2_as2_larger( 42 ; CHECK: icmp eq i8 addrspace(2)* %a, %b 43 define i1 @test2_as2_larger(i8 addrspace(2)* %a, i8 addrspace(2)* %b) { 44 %tmpa = ptrtoint i8 addrspace(2)* %a to i32 45 %tmpb = ptrtoint i8 addrspace(2)* %b to i32 46 %r = icmp eq i32 %tmpa, %tmpb 47 ret i1 %r 48 } 49 50 ; These casts should also be folded away. 51 ; CHECK-LABEL: @test3( 52 ; CHECK: icmp eq i8* %a, @global 53 @global = global i8 0 54 define i1 @test3(i8* %a) { 55 %tmpa = ptrtoint i8* %a to i32 56 %r = icmp eq i32 %tmpa, ptrtoint (i8* @global to i32) 57 ret i1 %r 58 } 59 60 define i1 @test4(i32 %A) { 61 %B = inttoptr i32 %A to i8* 62 %C = icmp eq i8* %B, null 63 ret i1 %C 64 ; CHECK-LABEL: @test4( 65 ; CHECK-NEXT: %C = icmp eq i32 %A, 0 66 ; CHECK-NEXT: ret i1 %C 67 } 68 69 define i1 @test4_as2(i16 %A) { 70 ; CHECK-LABEL: @test4_as2( 71 ; CHECK-NEXT: %C = icmp eq i16 %A, 0 72 ; CHECK-NEXT: ret i1 %C 73 %B = inttoptr i16 %A to i8 addrspace(2)* 74 %C = icmp eq i8 addrspace(2)* %B, null 75 ret i1 %C 76 } 77 78 79 ; Pulling the cast out of the load allows us to eliminate the load, and then 80 ; the whole array. 81 82 %op = type { float } 83 %unop = type { i32 } 84 @Array = internal constant [1 x %op* (%op*)*] [ %op* (%op*)* @foo ] ; <[1 x %op* (%op*)*]*> [#uses=1] 85 86 declare %op* @foo(%op* %X) 87 88 define %unop* @test5(%op* %O) { 89 %tmp = load %unop* (%op*)** bitcast ([1 x %op* (%op*)*]* @Array to %unop* (%op*)**); <%unop* (%op*)*> [#uses=1] 90 %tmp.2 = call %unop* %tmp( %op* %O ) ; <%unop*> [#uses=1] 91 ret %unop* %tmp.2 92 ; CHECK-LABEL: @test5( 93 ; CHECK: call %op* @foo(%op* %O) 94 } 95 96 97 98 ; InstCombine can not 'load (cast P)' -> cast (load P)' if the cast changes 99 ; the address space. 100 101 define i8 @test6(i8 addrspace(1)* %source) { 102 entry: 103 %arrayidx223 = addrspacecast i8 addrspace(1)* %source to i8* 104 %tmp4 = load i8* %arrayidx223 105 ret i8 %tmp4 106 ; CHECK-LABEL: @test6( 107 ; CHECK: load i8* %arrayidx223 108 } 109
